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venv/lib/python3.12/site-packages/billiard/__init__.py

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+"""Python multiprocessing fork with improvements and bugfixes"""
+#
+# Package analogous to 'threading.py' but using processes
+#
+# multiprocessing/__init__.py
+#
+# This package is intended to duplicate the functionality (and much of
+# the API) of threading.py but uses processes instead of threads.  A
+# subpackage 'multiprocessing.dummy' has the same API but is a simple
+# wrapper for 'threading'.
+#
+# Try calling `multiprocessing.doc.main()` to read the html
+# documentation in a webbrowser.
+#
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+
+import sys
+
+from . import context
+
+VERSION = (4, 2, 1)
+__version__ = '.'.join(map(str, VERSION[0:4])) + "".join(VERSION[4:])
+__author__ = 'R Oudkerk / Python Software Foundation'
+__author_email__ = 'python-dev@python.org'
+__maintainer__ = 'Asif Saif Uddin'
+__contact__ = "auvipy@gmail.com"
+__homepage__ = "https://github.com/celery/billiard"
+__docformat__ = "restructuredtext"
+
+# -eof meta-
+
+#
+# Copy stuff from default context
+#
+
+globals().update((name, getattr(context._default_context, name))
+                 for name in context._default_context.__all__)
+__all__ = context._default_context.__all__
+
+#
+# XXX These should not really be documented or public.
+#
+
+SUBDEBUG = 5
+SUBWARNING = 25
+
+#
+# Alias for main module -- will be reset by bootstrapping child processes
+#
+
+if '__main__' in sys.modules:
+    sys.modules['__mp_main__'] = sys.modules['__main__']
+
+
+def ensure_multiprocessing():
+    from ._ext import ensure_multiprocessing
+    return ensure_multiprocessing()

venv/lib/python3.12/site-packages/billiard/_ext.py

@@ -0,0 +1,32 @@
+import sys
+
+supports_exec = True
+
+from .compat import _winapi as win32  # noqa
+
+if sys.platform.startswith("java"):
+    _billiard = None
+else:
+    try:
+        import _billiard                                # noqa
+    except ImportError:
+        import _multiprocessing as _billiard            # noqa
+        supports_exec = False
+
+
+def ensure_multiprocessing():
+    if _billiard is None:
+        raise NotImplementedError("multiprocessing not supported")
+
+
+def ensure_SemLock():
+    try:
+        from _billiard import SemLock                   # noqa
+    except ImportError:
+        try:
+            from _multiprocessing import SemLock        # noqa
+        except ImportError:
+            raise ImportError("""\
+This platform lacks a functioning sem_open implementation, therefore,
+the required synchronization primitives needed will not function,
+see issue 3770.""")

venv/lib/python3.12/site-packages/billiard/_win.py

@@ -0,0 +1,114 @@
+"""
+    billiard._win
+    ~~~~~~~~~~~~~
+
+    Windows utilities to terminate process groups.
+
+"""
+
+import os
+
+# psutil is painfully slow in win32. So to avoid adding big
+# dependencies like pywin32 a ctypes based solution is preferred
+
+# Code based on the winappdbg project http://winappdbg.sourceforge.net/
+# (BSD License)
+from ctypes import (
+    byref, sizeof, windll,
+    Structure, WinError, POINTER,
+    c_size_t, c_char, c_void_p,
+)
+from ctypes.wintypes import DWORD, LONG
+
+ERROR_NO_MORE_FILES = 18
+INVALID_HANDLE_VALUE = c_void_p(-1).value
+
+
+class PROCESSENTRY32(Structure):
+    _fields_ = [
+        ('dwSize', DWORD),
+        ('cntUsage', DWORD),
+        ('th32ProcessID', DWORD),
+        ('th32DefaultHeapID', c_size_t),
+        ('th32ModuleID', DWORD),
+        ('cntThreads', DWORD),
+        ('th32ParentProcessID', DWORD),
+        ('pcPriClassBase', LONG),
+        ('dwFlags', DWORD),
+        ('szExeFile', c_char * 260),
+    ]
+LPPROCESSENTRY32 = POINTER(PROCESSENTRY32)
+
+
+def CreateToolhelp32Snapshot(dwFlags=2, th32ProcessID=0):
+    hSnapshot = windll.kernel32.CreateToolhelp32Snapshot(dwFlags,
+                                                         th32ProcessID)
+    if hSnapshot == INVALID_HANDLE_VALUE:
+        raise WinError()
+    return hSnapshot
+
+
+def Process32First(hSnapshot, pe=None):
+    return _Process32n(windll.kernel32.Process32First, hSnapshot, pe)
+
+
+def Process32Next(hSnapshot, pe=None):
+    return _Process32n(windll.kernel32.Process32Next, hSnapshot, pe)
+
+
+def _Process32n(fun, hSnapshot, pe=None):
+    if pe is None:
+        pe = PROCESSENTRY32()
+    pe.dwSize = sizeof(PROCESSENTRY32)
+    success = fun(hSnapshot, byref(pe))
+    if not success:
+        if windll.kernel32.GetLastError() == ERROR_NO_MORE_FILES:
+            return
+        raise WinError()
+    return pe
+
+
+def get_all_processes_pids():
+    """Return a dictionary with all processes pids as keys and their
+       parents as value. Ignore processes with no parents.
+    """
+    h = CreateToolhelp32Snapshot()
+    parents = {}
+    pe = Process32First(h)
+    while pe:
+        if pe.th32ParentProcessID:
+            parents[pe.th32ProcessID] = pe.th32ParentProcessID
+        pe = Process32Next(h, pe)
+
+    return parents
+
+
+def get_processtree_pids(pid, include_parent=True):
+    """Return a list with all the pids of a process tree"""
+    parents = get_all_processes_pids()
+    all_pids = list(parents.keys())
+    pids = {pid}
+    while 1:
+        pids_new = pids.copy()
+
+        for _pid in all_pids:
+            if parents[_pid] in pids:
+                pids_new.add(_pid)
+
+        if pids_new == pids:
+            break
+
+        pids = pids_new.copy()
+
+    if not include_parent:
+        pids.remove(pid)
+
+    return list(pids)
+
+
+def kill_processtree(pid, signum):
+    """Kill a process and all its descendants"""
+    family_pids = get_processtree_pids(pid)
+
+    for _pid in family_pids:
+        os.kill(_pid, signum)

venv/lib/python3.12/site-packages/billiard/common.py

@@ -0,0 +1,156 @@
+"""
+This module contains utilities added by billiard, to keep
+"non-core" functionality out of ``.util``."""
+
+import os
+import signal
+import sys
+
+import pickle
+
+from .exceptions import RestartFreqExceeded
+from time import monotonic
+
+pickle_load = pickle.load
+pickle_loads = pickle.loads
+
+# cPickle.loads does not support buffer() objects,
+# but we can just create a StringIO and use load.
+from io import BytesIO
+
+
+SIGMAP = dict(
+    (getattr(signal, n), n) for n in dir(signal) if n.startswith('SIG')
+)
+for _alias_sig in ('SIGHUP', 'SIGABRT'):
+    try:
+        # Alias for deprecated signal overwrites the name we want
+        SIGMAP[getattr(signal, _alias_sig)] = _alias_sig
+    except AttributeError:
+        pass
+
+
+TERM_SIGNAL, TERM_SIGNAME = signal.SIGTERM, 'SIGTERM'
+REMAP_SIGTERM = os.environ.get('REMAP_SIGTERM')
+if REMAP_SIGTERM:
+    TERM_SIGNAL, TERM_SIGNAME = (
+        getattr(signal, REMAP_SIGTERM), REMAP_SIGTERM)
+
+
+TERMSIGS_IGNORE = {'SIGTERM'} if REMAP_SIGTERM else set()
+TERMSIGS_FORCE = {'SIGQUIT'} if REMAP_SIGTERM else set()
+
+EX_SOFTWARE = 70
+
+TERMSIGS_DEFAULT = {
+    'SIGHUP',
+    'SIGQUIT',
+    TERM_SIGNAME,
+    'SIGUSR1',
+}
+
+TERMSIGS_FULL = {
+    'SIGHUP',
+    'SIGQUIT',
+    'SIGTRAP',
+    'SIGABRT',
+    'SIGEMT',
+    'SIGSYS',
+    'SIGPIPE',
+    'SIGALRM',
+    TERM_SIGNAME,
+    'SIGXCPU',
+    'SIGXFSZ',
+    'SIGVTALRM',
+    'SIGPROF',
+    'SIGUSR1',
+    'SIGUSR2',
+}
+
+#: set by signal handlers just before calling exit.
+#: if this is true after the sighandler returns it means that something
+#: went wrong while terminating the process, and :func:`os._exit`
+#: must be called ASAP.
+_should_have_exited = [False]
+
+
+def human_status(status):
+    if (status or 0) < 0:
+        try:
+            return 'signal {0} ({1})'.format(-status, SIGMAP[-status])
+        except KeyError:
+            return 'signal {0}'.format(-status)
+    return 'exitcode {0}'.format(status)
+
+
+def pickle_loads(s, load=pickle_load):
+    # used to support buffer objects
+    return load(BytesIO(s))
+
+
+def maybe_setsignal(signum, handler):
+    try:
+        signal.signal(signum, handler)
+    except (OSError, AttributeError, ValueError, RuntimeError):
+        pass
+
+
+def _shutdown_cleanup(signum, frame):
+    # we will exit here so if the signal is received a second time
+    # we can be sure that something is very wrong and we may be in
+    # a crashing loop.
+    if _should_have_exited[0]:
+        os._exit(EX_SOFTWARE)
+    maybe_setsignal(signum, signal.SIG_DFL)
+    _should_have_exited[0] = True
+    sys.exit(-(256 - signum))
+
+
+def signum(sig):
+    return getattr(signal, sig, None)
+
+
+def _should_override_term_signal(sig, current):
+    return (
+        sig in TERMSIGS_FORCE or
+        (current is not None and current != signal.SIG_IGN)
+    )
+
+
+def reset_signals(handler=_shutdown_cleanup, full=False):
+    for sig in TERMSIGS_FULL if full else TERMSIGS_DEFAULT:
+        num = signum(sig)
+        if num:
+            if _should_override_term_signal(sig, signal.getsignal(num)):
+                maybe_setsignal(num, handler)
+    for sig in TERMSIGS_IGNORE:
+        num = signum(sig)
+        if num:
+            maybe_setsignal(num, signal.SIG_IGN)
+
+
+class restart_state:
+    RestartFreqExceeded = RestartFreqExceeded
+
+    def __init__(self, maxR, maxT):
+        self.maxR, self.maxT = maxR, maxT
+        self.R, self.T = 0, None
+
+    def step(self, now=None):
+        now = monotonic() if now is None else now
+        R = self.R
+        if self.T and now - self.T >= self.maxT:
+            # maxT passed, reset counter and time passed.
+            self.T, self.R = now, 0
+        elif self.maxR and self.R >= self.maxR:
+            # verify that R has a value as the result handler
+            # resets this when a job is accepted. If a job is accepted
+            # the startup probably went fine (startup restart burst
+            # protection)
+            if self.R:  # pragma: no cover
+                self.R = 0  # reset in case someone catches the error
+                raise self.RestartFreqExceeded("%r in %rs" % (R, self.maxT))
+        # first run sets T
+        if self.T is None:
+            self.T = now
+        self.R += 1

venv/lib/python3.12/site-packages/billiard/compat.py

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+import errno
+import numbers
+import os
+import subprocess
+import sys
+
+from itertools import zip_longest
+
+if sys.platform == 'win32':
+    try:
+        import _winapi  # noqa
+    except ImportError:                            # pragma: no cover
+        from _multiprocessing import win32 as _winapi  # noqa
+else:
+    _winapi = None  # noqa
+
+try:
+    import resource
+except ImportError:  # pragma: no cover
+    resource = None
+
+from io import UnsupportedOperation
+FILENO_ERRORS = (AttributeError, ValueError, UnsupportedOperation)
+
+
+if hasattr(os, 'write'):
+    __write__ = os.write
+
+    def send_offset(fd, buf, offset):
+        return __write__(fd, buf[offset:])
+
+else:  # non-posix platform
+
+    def send_offset(fd, buf, offset):  # noqa
+        raise NotImplementedError('send_offset')
+
+
+try:
+    fsencode = os.fsencode
+    fsdecode = os.fsdecode
+except AttributeError:
+    def _fscodec():
+        encoding = sys.getfilesystemencoding()
+        if encoding == 'mbcs':
+            errors = 'strict'
+        else:
+            errors = 'surrogateescape'
+
+        def fsencode(filename):
+            """
+            Encode filename to the filesystem encoding with 'surrogateescape'
+            error handler, return bytes unchanged. On Windows, use 'strict'
+            error handler if the file system encoding is 'mbcs' (which is the
+            default encoding).
+            """
+            if isinstance(filename, bytes):
+                return filename
+            elif isinstance(filename, str):
+                return filename.encode(encoding, errors)
+            else:
+                raise TypeError("expect bytes or str, not %s"
+                                % type(filename).__name__)
+
+        def fsdecode(filename):
+            """
+            Decode filename from the filesystem encoding with 'surrogateescape'
+            error handler, return str unchanged. On Windows, use 'strict' error
+            handler if the file system encoding is 'mbcs' (which is the default
+            encoding).
+            """
+            if isinstance(filename, str):
+                return filename
+            elif isinstance(filename, bytes):
+                return filename.decode(encoding, errors)
+            else:
+                raise TypeError("expect bytes or str, not %s"
+                                % type(filename).__name__)
+
+        return fsencode, fsdecode
+
+    fsencode, fsdecode = _fscodec()
+    del _fscodec
+
+
+def maybe_fileno(f):
+    """Get object fileno, or :const:`None` if not defined."""
+    if isinstance(f, numbers.Integral):
+        return f
+    try:
+        return f.fileno()
+    except FILENO_ERRORS:
+        pass
+
+
+def get_fdmax(default=None):
+    """Return the maximum number of open file descriptors
+    on this system.
+
+    :keyword default: Value returned if there's no file
+                      descriptor limit.
+
+    """
+    try:
+        return os.sysconf('SC_OPEN_MAX')
+    except:
+        pass
+    if resource is None:  # Windows
+        return default
+    fdmax = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
+    if fdmax == resource.RLIM_INFINITY:
+        return default
+    return fdmax
+
+
+def uniq(it):
+    """Return all unique elements in ``it``, preserving order."""
+    seen = set()
+    return (seen.add(obj) or obj for obj in it if obj not in seen)
+
+
+try:
+    closerange = os.closerange
+except AttributeError:
+
+    def closerange(fd_low, fd_high):  # noqa
+        for fd in reversed(range(fd_low, fd_high)):
+            try:
+                os.close(fd)
+            except OSError as exc:
+                if exc.errno != errno.EBADF:
+                    raise
+
+    def close_open_fds(keep=None):
+        # must make sure this is 0-inclusive (Issue #celery/1882)
+        keep = list(uniq(sorted(
+            f for f in map(maybe_fileno, keep or []) if f is not None
+        )))
+        maxfd = get_fdmax(default=2048)
+        kL, kH = iter([-1] + keep), iter(keep + [maxfd])
+        for low, high in zip_longest(kL, kH):
+            if low + 1 != high:
+                closerange(low + 1, high)
+else:
+    def close_open_fds(keep=None):  # noqa
+        keep = [maybe_fileno(f)
+                for f in (keep or []) if maybe_fileno(f) is not None]
+        for fd in reversed(range(get_fdmax(default=2048))):
+            if fd not in keep:
+                try:
+                    os.close(fd)
+                except OSError as exc:
+                    if exc.errno != errno.EBADF:
+                        raise
+
+
+def get_errno(exc):
+    """:exc:`socket.error` and :exc:`IOError` first got
+    the ``.errno`` attribute in Py2.7"""
+    try:
+        return exc.errno
+    except AttributeError:
+        return 0
+
+
+try:
+    import _posixsubprocess
+except ImportError:
+    def spawnv_passfds(path, args, passfds):
+        if sys.platform != 'win32':
+            # when not using _posixsubprocess (on earlier python) and not on
+            # windows, we want to keep stdout/stderr open...
+            passfds = passfds + [
+                maybe_fileno(sys.stdout),
+                maybe_fileno(sys.stderr),
+            ]
+        pid = os.fork()
+        if not pid:
+            close_open_fds(keep=sorted(f for f in passfds if f))
+            os.execv(fsencode(path), args)
+        return pid
+else:
+    def spawnv_passfds(path, args, passfds):
+        passfds = sorted(passfds)
+        errpipe_read, errpipe_write = os.pipe()
+        try:
+            args = [
+                args, [fsencode(path)], True, tuple(passfds), None, None,
+                -1, -1, -1, -1, -1, -1, errpipe_read, errpipe_write,
+                False, False]
+            if sys.version_info >= (3, 11):
+                args.append(-1)  # process_group
+            if sys.version_info >= (3, 9):
+                args.extend((None, None, None, -1))  # group, extra_groups, user, umask
+            args.append(None)  # preexec_fn
+            if sys.version_info >= (3, 11):
+                args.append(subprocess._USE_VFORK)
+            return _posixsubprocess.fork_exec(*args)
+        finally:
+            os.close(errpipe_read)
+            os.close(errpipe_write)
+
+
+if sys.platform == 'win32':
+
+    def setblocking(handle, blocking):
+        raise NotImplementedError('setblocking not implemented on win32')
+
+    def isblocking(handle):
+        raise NotImplementedError('isblocking not implemented on win32')
+
+else:
+    from os import O_NONBLOCK
+    from fcntl import fcntl, F_GETFL, F_SETFL
+
+    def isblocking(handle):  # noqa
+        return not (fcntl(handle, F_GETFL) & O_NONBLOCK)
+
+    def setblocking(handle, blocking):  # noqa
+        flags = fcntl(handle, F_GETFL, 0)
+        fcntl(
+            handle, F_SETFL,
+            flags & (~O_NONBLOCK) if blocking else flags | O_NONBLOCK,
+        )
+
+
+E_PSUTIL_MISSING = """
+On Windows, the ability to inspect memory usage requires the psutil library.
+
+You can install it using pip:
+
+    $ pip install psutil
+"""
+
+
+E_RESOURCE_MISSING = """
+Your platform ({0}) does not seem to have the `resource.getrusage' function.
+
+Please open an issue so that we can add support for this platform.
+"""
+
+
+if sys.platform == 'win32':
+
+    try:
+        import psutil
+    except ImportError:  # pragma: no cover
+        psutil = None    # noqa
+
+    def mem_rss():
+        # type () -> int
+        if psutil is None:
+            raise ImportError(E_PSUTIL_MISSING.strip())
+        return int(psutil.Process(os.getpid()).memory_info()[0] / 1024.0)
+
+else:
+    try:
+        from resource import getrusage, RUSAGE_SELF
+    except ImportError:  # pragma: no cover
+        getrusage = RUSAGE_SELF = None  # noqa
+
+    if 'bsd' in sys.platform or sys.platform == 'darwin':
+        # On BSD platforms :man:`getrusage(2)` ru_maxrss field is in bytes.
+
+        def maxrss_to_kb(v):
+            # type: (SupportsInt) -> int
+            return int(v) / 1024.0
+
+    else:
+        # On Linux it's kilobytes.
+
+        def maxrss_to_kb(v):
+            # type: (SupportsInt) -> int
+            return int(v)
+
+    def mem_rss():
+        # type () -> int
+        if resource is None:
+            raise ImportError(E_RESOURCE_MISSING.strip().format(sys.platform))
+        return maxrss_to_kb(getrusage(RUSAGE_SELF).ru_maxrss)

venv/lib/python3.12/site-packages/billiard/context.py

@@ -0,0 +1,420 @@
+import os
+import sys
+import threading
+import warnings
+
+from . import process
+
+__all__ = []            # things are copied from here to __init__.py
+
+
+W_NO_EXECV = """\
+force_execv is not supported as the billiard C extension \
+is not installed\
+"""
+
+
+#
+# Exceptions
+#
+
+from .exceptions import (  # noqa
+    ProcessError,
+    BufferTooShort,
+    TimeoutError,
+    AuthenticationError,
+    TimeLimitExceeded,
+    SoftTimeLimitExceeded,
+    WorkerLostError,
+)
+
+
+#
+# Base type for contexts
+#
+
+class BaseContext:
+
+    ProcessError = ProcessError
+    BufferTooShort = BufferTooShort
+    TimeoutError = TimeoutError
+    AuthenticationError = AuthenticationError
+    TimeLimitExceeded = TimeLimitExceeded
+    SoftTimeLimitExceeded = SoftTimeLimitExceeded
+    WorkerLostError = WorkerLostError
+
+    current_process = staticmethod(process.current_process)
+    active_children = staticmethod(process.active_children)
+
+    if hasattr(os, 'cpu_count'):
+        def cpu_count(self):
+            '''Returns the number of CPUs in the system'''
+            num = os.cpu_count()
+            if num is None:
+                raise NotImplementedError('cannot determine number of cpus')
+            else:
+                return num
+    else:
+        def cpu_count(self):  # noqa
+            if sys.platform == 'win32':
+                try:
+                    num = int(os.environ['NUMBER_OF_PROCESSORS'])
+                except (ValueError, KeyError):
+                    num = 0
+            elif 'bsd' in sys.platform or sys.platform == 'darwin':
+                comm = '/sbin/sysctl -n hw.ncpu'
+                if sys.platform == 'darwin':
+                    comm = '/usr' + comm
+                try:
+                    with os.popen(comm) as p:
+                        num = int(p.read())
+                except ValueError:
+                    num = 0
+            else:
+                try:
+                    num = os.sysconf('SC_NPROCESSORS_ONLN')
+                except (ValueError, OSError, AttributeError):
+                    num = 0
+
+            if num >= 1:
+                return num
+            else:
+                raise NotImplementedError('cannot determine number of cpus')
+
+    def Manager(self):
+        '''Returns a manager associated with a running server process
+
+        The managers methods such as `Lock()`, `Condition()` and `Queue()`
+        can be used to create shared objects.
+        '''
+        from .managers import SyncManager
+        m = SyncManager(ctx=self.get_context())
+        m.start()
+        return m
+
+    def Pipe(self, duplex=True, rnonblock=False, wnonblock=False):
+        '''Returns two connection object connected by a pipe'''
+        from .connection import Pipe
+        return Pipe(duplex, rnonblock, wnonblock)
+
+    def Lock(self):
+        '''Returns a non-recursive lock object'''
+        from .synchronize import Lock
+        return Lock(ctx=self.get_context())
+
+    def RLock(self):
+        '''Returns a recursive lock object'''
+        from .synchronize import RLock
+        return RLock(ctx=self.get_context())
+
+    def Condition(self, lock=None):
+        '''Returns a condition object'''
+        from .synchronize import Condition
+        return Condition(lock, ctx=self.get_context())
+
+    def Semaphore(self, value=1):
+        '''Returns a semaphore object'''
+        from .synchronize import Semaphore
+        return Semaphore(value, ctx=self.get_context())
+
+    def BoundedSemaphore(self, value=1):
+        '''Returns a bounded semaphore object'''
+        from .synchronize import BoundedSemaphore
+        return BoundedSemaphore(value, ctx=self.get_context())
+
+    def Event(self):
+        '''Returns an event object'''
+        from .synchronize import Event
+        return Event(ctx=self.get_context())
+
+    def Barrier(self, parties, action=None, timeout=None):
+        '''Returns a barrier object'''
+        from .synchronize import Barrier
+        return Barrier(parties, action, timeout, ctx=self.get_context())
+
+    def Queue(self, maxsize=0):
+        '''Returns a queue object'''
+        from .queues import Queue
+        return Queue(maxsize, ctx=self.get_context())
+
+    def JoinableQueue(self, maxsize=0):
+        '''Returns a queue object'''
+        from .queues import JoinableQueue
+        return JoinableQueue(maxsize, ctx=self.get_context())
+
+    def SimpleQueue(self):
+        '''Returns a queue object'''
+        from .queues import SimpleQueue
+        return SimpleQueue(ctx=self.get_context())
+
+    def Pool(self, processes=None, initializer=None, initargs=(),
+             maxtasksperchild=None, timeout=None, soft_timeout=None,
+             lost_worker_timeout=None, max_restarts=None,
+             max_restart_freq=1, on_process_up=None, on_process_down=None,
+             on_timeout_set=None, on_timeout_cancel=None, threads=True,
+             semaphore=None, putlocks=False, allow_restart=False):
+        '''Returns a process pool object'''
+        from .pool import Pool
+        return Pool(processes, initializer, initargs, maxtasksperchild,
+                    timeout, soft_timeout, lost_worker_timeout,
+                    max_restarts, max_restart_freq, on_process_up,
+                    on_process_down, on_timeout_set, on_timeout_cancel,
+                    threads, semaphore, putlocks, allow_restart,
+                    context=self.get_context())
+
+    def RawValue(self, typecode_or_type, *args):
+        '''Returns a shared object'''
+        from .sharedctypes import RawValue
+        return RawValue(typecode_or_type, *args)
+
+    def RawArray(self, typecode_or_type, size_or_initializer):
+        '''Returns a shared array'''
+        from .sharedctypes import RawArray
+        return RawArray(typecode_or_type, size_or_initializer)
+
+    def Value(self, typecode_or_type, *args, **kwargs):
+        '''Returns a synchronized shared object'''
+        from .sharedctypes import Value
+        lock = kwargs.get('lock', True)
+        return Value(typecode_or_type, *args, lock=lock,
+                     ctx=self.get_context())
+
+    def Array(self, typecode_or_type, size_or_initializer, *args, **kwargs):
+        '''Returns a synchronized shared array'''
+        from .sharedctypes import Array
+        lock = kwargs.get('lock', True)
+        return Array(typecode_or_type, size_or_initializer, lock=lock,
+                     ctx=self.get_context())
+
+    def freeze_support(self):
+        '''Check whether this is a fake forked process in a frozen executable.
+        If so then run code specified by commandline and exit.
+        '''
+        if sys.platform == 'win32' and getattr(sys, 'frozen', False):
+            from .spawn import freeze_support
+            freeze_support()
+
+    def get_logger(self):
+        '''Return package logger -- if it does not already exist then
+        it is created.
+        '''
+        from .util import get_logger
+        return get_logger()
+
+    def log_to_stderr(self, level=None):
+        '''Turn on logging and add a handler which prints to stderr'''
+        from .util import log_to_stderr
+        return log_to_stderr(level)
+
+    def allow_connection_pickling(self):
+        '''Install support for sending connections and sockets
+        between processes
+        '''
+        # This is undocumented.  In previous versions of multiprocessing
+        # its only effect was to make socket objects inheritable on Windows.
+        from . import connection  # noqa
+
+    def set_executable(self, executable):
+        '''Sets the path to a python.exe or pythonw.exe binary used to run
+        child processes instead of sys.executable when using the 'spawn'
+        start method.  Useful for people embedding Python.
+        '''
+        from .spawn import set_executable
+        set_executable(executable)
+
+    def set_forkserver_preload(self, module_names):
+        '''Set list of module names to try to load in forkserver process.
+        This is really just a hint.
+        '''
+        from .forkserver import set_forkserver_preload
+        set_forkserver_preload(module_names)
+
+    def get_context(self, method=None):
+        if method is None:
+            return self
+        try:
+            ctx = _concrete_contexts[method]
+        except KeyError:
+            raise ValueError('cannot find context for %r' % method)
+        ctx._check_available()
+        return ctx
+
+    def get_start_method(self, allow_none=False):
+        return self._name
+
+    def set_start_method(self, method=None):
+        raise ValueError('cannot set start method of concrete context')
+
+    def forking_is_enabled(self):
+        # XXX for compatibility with billiard <3.4
+        return (self.get_start_method() or 'fork') == 'fork'
+
+    def forking_enable(self, value):
+        # XXX for compatibility with billiard <3.4
+        if not value:
+            from ._ext import supports_exec
+            if supports_exec:
+                self.set_start_method('spawn', force=True)
+            else:
+                warnings.warn(RuntimeWarning(W_NO_EXECV))
+
+    def _check_available(self):
+        pass
+
+#
+# Type of default context -- underlying context can be set at most once
+#
+
+
+class Process(process.BaseProcess):
+    _start_method = None
+
+    @staticmethod
+    def _Popen(process_obj):
+        return _default_context.get_context().Process._Popen(process_obj)
+
+
+class DefaultContext(BaseContext):
+    Process = Process
+
+    def __init__(self, context):
+        self._default_context = context
+        self._actual_context = None
+
+    def get_context(self, method=None):
+        if method is None:
+            if self._actual_context is None:
+                self._actual_context = self._default_context
+            return self._actual_context
+        else:
+            return super(DefaultContext, self).get_context(method)
+
+    def set_start_method(self, method, force=False):
+        if self._actual_context is not None and not force:
+            raise RuntimeError('context has already been set')
+        if method is None and force:
+            self._actual_context = None
+            return
+        self._actual_context = self.get_context(method)
+
+    def get_start_method(self, allow_none=False):
+        if self._actual_context is None:
+            if allow_none:
+                return None
+            self._actual_context = self._default_context
+        return self._actual_context._name
+
+    def get_all_start_methods(self):
+        if sys.platform == 'win32':
+            return ['spawn']
+        else:
+            from . import reduction
+            if reduction.HAVE_SEND_HANDLE:
+                return ['fork', 'spawn', 'forkserver']
+            else:
+                return ['fork', 'spawn']
+
+DefaultContext.__all__ = list(x for x in dir(DefaultContext) if x[0] != '_')
+
+#
+# Context types for fixed start method
+#
+
+if sys.platform != 'win32':
+
+    class ForkProcess(process.BaseProcess):
+        _start_method = 'fork'
+
+        @staticmethod
+        def _Popen(process_obj):
+            from .popen_fork import Popen
+            return Popen(process_obj)
+
+    class SpawnProcess(process.BaseProcess):
+        _start_method = 'spawn'
+
+        @staticmethod
+        def _Popen(process_obj):
+            from .popen_spawn_posix import Popen
+            return Popen(process_obj)
+
+    class ForkServerProcess(process.BaseProcess):
+        _start_method = 'forkserver'
+
+        @staticmethod
+        def _Popen(process_obj):
+            from .popen_forkserver import Popen
+            return Popen(process_obj)
+
+    class ForkContext(BaseContext):
+        _name = 'fork'
+        Process = ForkProcess
+
+    class SpawnContext(BaseContext):
+        _name = 'spawn'
+        Process = SpawnProcess
+
+    class ForkServerContext(BaseContext):
+        _name = 'forkserver'
+        Process = ForkServerProcess
+
+        def _check_available(self):
+            from . import reduction
+            if not reduction.HAVE_SEND_HANDLE:
+                raise ValueError('forkserver start method not available')
+
+    _concrete_contexts = {
+        'fork': ForkContext(),
+        'spawn': SpawnContext(),
+        'forkserver': ForkServerContext(),
+    }
+    _default_context = DefaultContext(_concrete_contexts['fork'])
+
+else:
+
+    class SpawnProcess(process.BaseProcess):
+        _start_method = 'spawn'
+
+        @staticmethod
+        def _Popen(process_obj):
+            from .popen_spawn_win32 import Popen
+            return Popen(process_obj)
+
+    class SpawnContext(BaseContext):
+        _name = 'spawn'
+        Process = SpawnProcess
+
+    _concrete_contexts = {
+        'spawn': SpawnContext(),
+    }
+    _default_context = DefaultContext(_concrete_contexts['spawn'])
+
+#
+# Force the start method
+#
+
+
+def _force_start_method(method):
+    _default_context._actual_context = _concrete_contexts[method]
+
+#
+# Check that the current thread is spawning a child process
+#
+
+_tls = threading.local()
+
+
+def get_spawning_popen():
+    return getattr(_tls, 'spawning_popen', None)
+
+
+def set_spawning_popen(popen):
+    _tls.spawning_popen = popen
+
+
+def assert_spawning(obj):
+    if get_spawning_popen() is None:
+        raise RuntimeError(
+            '%s objects should only be shared between processes'
+            ' through inheritance' % type(obj).__name__
+        )

venv/lib/python3.12/site-packages/billiard/dummy/__init__.py

@@ -0,0 +1,166 @@
+#
+# Support for the API of the multiprocessing package using threads
+#
+# multiprocessing/dummy/__init__.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of author nor the names of any contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+#
+# Imports
+#
+
+import threading
+import sys
+import weakref
+import array
+
+from threading import Lock, RLock, Semaphore, BoundedSemaphore
+from threading import Event
+
+from queue import Queue
+
+from billiard.connection import Pipe
+
+__all__ = [
+    'Process', 'current_process', 'active_children', 'freeze_support',
+    'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition',
+    'Event', 'Queue', 'Manager', 'Pipe', 'Pool', 'JoinableQueue'
+]
+
+
+class DummyProcess(threading.Thread):
+
+    def __init__(self, group=None, target=None, name=None, args=(), kwargs={}):
+        threading.Thread.__init__(self, group, target, name, args, kwargs)
+        self._pid = None
+        self._children = weakref.WeakKeyDictionary()
+        self._start_called = False
+        self._parent = current_process()
+
+    def start(self):
+        assert self._parent is current_process()
+        self._start_called = True
+        if hasattr(self._parent, '_children'):
+            self._parent._children[self] = None
+        threading.Thread.start(self)
+
+    @property
+    def exitcode(self):
+        if self._start_called and not self.is_alive():
+            return 0
+        else:
+            return None
+
+
+try:
+    _Condition = threading._Condition
+except AttributeError:  # Py3
+    _Condition = threading.Condition  # noqa
+
+
+class Condition(_Condition):
+    if sys.version_info[0] == 3:
+        notify_all = _Condition.notifyAll
+    else:
+        notify_all = _Condition.notifyAll.__func__
+
+
+Process = DummyProcess
+current_process = threading.current_thread
+current_process()._children = weakref.WeakKeyDictionary()
+
+
+def active_children():
+    children = current_process()._children
+    for p in list(children):
+        if not p.is_alive():
+            children.pop(p, None)
+    return list(children)
+
+
+def freeze_support():
+    pass
+
+
+class Namespace(object):
+
+    def __init__(self, **kwds):
+        self.__dict__.update(kwds)
+
+    def __repr__(self):
+        items = list(self.__dict__.items())
+        temp = []
+        for name, value in items:
+            if not name.startswith('_'):
+                temp.append('%s=%r' % (name, value))
+        temp.sort()
+        return '%s(%s)' % (self.__class__.__name__, str.join(', ', temp))
+
+
+dict = dict
+list = list
+
+
+def Array(typecode, sequence, lock=True):
+    return array.array(typecode, sequence)
+
+
+class Value(object):
+
+    def __init__(self, typecode, value, lock=True):
+        self._typecode = typecode
+        self._value = value
+
+    def _get(self):
+        return self._value
+
+    def _set(self, value):
+        self._value = value
+    value = property(_get, _set)
+
+    def __repr__(self):
+        return '<%r(%r, %r)>' % (type(self).__name__,
+                                 self._typecode, self._value)
+
+
+def Manager():
+    return sys.modules[__name__]
+
+
+def shutdown():
+    pass
+
+
+def Pool(processes=None, initializer=None, initargs=()):
+    from billiard.pool import ThreadPool
+    return ThreadPool(processes, initializer, initargs)
+
+
+JoinableQueue = Queue

venv/lib/python3.12/site-packages/billiard/dummy/connection.py

@@ -0,0 +1,92 @@
+#
+# Analogue of `multiprocessing.connection` which uses queues instead of sockets
+#
+# multiprocessing/dummy/connection.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of author nor the names of any contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+from queue import Queue
+
+__all__ = ['Client', 'Listener', 'Pipe']
+
+families = [None]
+
+
+class Listener(object):
+
+    def __init__(self, address=None, family=None, backlog=1):
+        self._backlog_queue = Queue(backlog)
+
+    def accept(self):
+        return Connection(*self._backlog_queue.get())
+
+    def close(self):
+        self._backlog_queue = None
+
+    address = property(lambda self: self._backlog_queue)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *exc_info):
+        self.close()
+
+
+def Client(address):
+    _in, _out = Queue(), Queue()
+    address.put((_out, _in))
+    return Connection(_in, _out)
+
+
+def Pipe(duplex=True):
+    a, b = Queue(), Queue()
+    return Connection(a, b), Connection(b, a)
+
+
+class Connection(object):
+
+    def __init__(self, _in, _out):
+        self._out = _out
+        self._in = _in
+        self.send = self.send_bytes = _out.put
+        self.recv = self.recv_bytes = _in.get
+
+    def poll(self, timeout=0.0):
+        if self._in.qsize() > 0:
+            return True
+        if timeout <= 0.0:
+            return False
+        self._in.not_empty.acquire()
+        self._in.not_empty.wait(timeout)
+        self._in.not_empty.release()
+        return self._in.qsize() > 0
+
+    def close(self):
+        pass

venv/lib/python3.12/site-packages/billiard/einfo.py

@@ -0,0 +1,192 @@
+import sys
+import traceback
+
+__all__ = ['ExceptionInfo', 'Traceback']
+
+DEFAULT_MAX_FRAMES = sys.getrecursionlimit() // 8
+
+
+class _Code:
+
+    def __init__(self, code):
+        self.co_filename = code.co_filename
+        self.co_name = code.co_name
+        self.co_argcount = code.co_argcount
+        self.co_cellvars = ()
+        self.co_firstlineno = code.co_firstlineno
+        self.co_flags = code.co_flags
+        self.co_freevars = ()
+        self.co_code = b''
+        self.co_lnotab = b''
+        self.co_names = code.co_names
+        self.co_nlocals = code.co_nlocals
+        self.co_stacksize = code.co_stacksize
+        self.co_varnames = ()
+        if sys.version_info >= (3, 11):
+            self._co_positions = list(code.co_positions())
+
+    if sys.version_info >= (3, 11):
+        @property
+        def co_positions(self):
+            return self._co_positions.__iter__
+
+
+class _Frame:
+    Code = _Code
+
+    def __init__(self, frame):
+        self.f_builtins = {}
+        self.f_globals = {
+            "__file__": frame.f_globals.get("__file__", "__main__"),
+            "__name__": frame.f_globals.get("__name__"),
+            "__loader__": None,
+        }
+        self.f_locals = fl = {}
+        try:
+            fl["__traceback_hide__"] = frame.f_locals["__traceback_hide__"]
+        except KeyError:
+            pass
+        self.f_back = None
+        self.f_trace = None
+        self.f_exc_traceback = None
+        self.f_exc_type = None
+        self.f_exc_value = None
+        self.f_code = self.Code(frame.f_code)
+        self.f_lineno = frame.f_lineno
+        self.f_lasti = frame.f_lasti
+        # don't want to hit https://bugs.python.org/issue21967
+        self.f_restricted = False
+
+    if sys.version_info >= (3, 11):
+        @property
+        def co_positions(self):
+            return self.f_code.co_positions
+
+
+class _Object:
+
+    def __init__(self, **kw):
+        [setattr(self, k, v) for k, v in kw.items()]
+
+    if sys.version_info >= (3, 11):
+        __default_co_positions__ = ((None, None, None, None),)
+
+        @property
+        def co_positions(self):
+            return getattr(
+                self,
+                "_co_positions",
+                self.__default_co_positions__
+            ).__iter__
+
+        @co_positions.setter
+        def co_positions(self, value):
+            self._co_positions = value  # noqa
+
+
+class _Truncated:
+
+    def __init__(self):
+        self.tb_lineno = -1
+        self.tb_frame = _Object(
+            f_globals={"__file__": "",
+                       "__name__": "",
+                       "__loader__": None},
+            f_fileno=None,
+            f_code=_Object(co_filename="...",
+                           co_name="[rest of traceback truncated]"),
+        )
+        self.tb_next = None
+        self.tb_lasti = 0
+
+    if sys.version_info >= (3, 11):
+        @property
+        def co_positions(self):
+            return self.tb_frame.co_positions
+
+
+class Traceback:
+    Frame = _Frame
+
+    def __init__(self, tb, max_frames=DEFAULT_MAX_FRAMES, depth=0):
+        self.tb_frame = self.Frame(tb.tb_frame)
+        self.tb_lineno = tb.tb_lineno
+        self.tb_lasti = tb.tb_lasti
+        self.tb_next = None
+        if tb.tb_next is not None:
+            if depth <= max_frames:
+                self.tb_next = Traceback(tb.tb_next, max_frames, depth + 1)
+            else:
+                self.tb_next = _Truncated()
+
+
+class RemoteTraceback(Exception):
+    def __init__(self, tb):
+        self.tb = tb
+
+    def __str__(self):
+        return self.tb
+
+
+class ExceptionWithTraceback(Exception):
+    def __init__(self, exc, tb):
+        self.exc = exc
+        self.tb = '\n"""\n%s"""' % tb
+        super().__init__()
+
+    def __str__(self):
+        return self.tb
+
+    def __reduce__(self):
+        return rebuild_exc, (self.exc, self.tb)
+
+
+def rebuild_exc(exc, tb):
+    exc.__cause__ = RemoteTraceback(tb)
+    return exc
+
+
+class ExceptionInfo:
+    """Exception wrapping an exception and its traceback.
+
+    :param exc_info: The exception info tuple as returned by
+        :func:`sys.exc_info`.
+
+    """
+
+    #: Exception type.
+    type = None
+
+    #: Exception instance.
+    exception = None
+
+    #: Pickleable traceback instance for use with :mod:`traceback`
+    tb = None
+
+    #: String representation of the traceback.
+    traceback = None
+
+    #: Set to true if this is an internal error.
+    internal = False
+
+    def __init__(self, exc_info=None, internal=False):
+        self.type, exception, tb = exc_info or sys.exc_info()
+        try:
+            self.tb = Traceback(tb)
+            self.traceback = ''.join(
+                traceback.format_exception(self.type, exception, tb),
+            )
+            self.internal = internal
+        finally:
+            del tb
+        self.exception = ExceptionWithTraceback(exception, self.traceback)
+
+    def __str__(self):
+        return self.traceback
+
+    def __repr__(self):
+        return "<%s: %r>" % (self.__class__.__name__, self.exception, )
+
+    @property
+    def exc_info(self):
+        return self.type, self.exception, self.tb

venv/lib/python3.12/site-packages/billiard/exceptions.py

@@ -0,0 +1,52 @@
+try:
+    from multiprocessing import (
+        ProcessError,
+        BufferTooShort,
+        TimeoutError,
+        AuthenticationError,
+    )
+except ImportError:
+    class ProcessError(Exception):             # noqa
+        pass
+
+    class BufferTooShort(ProcessError):        # noqa
+        pass
+
+    class TimeoutError(ProcessError):          # noqa
+        pass
+
+    class AuthenticationError(ProcessError):   # noqa
+        pass
+
+
+class TimeLimitExceeded(Exception):
+    """The time limit has been exceeded and the job has been terminated."""
+
+    def __str__(self):
+        return "TimeLimitExceeded%s" % (self.args, )
+
+
+class SoftTimeLimitExceeded(Exception):
+    """The soft time limit has been exceeded. This exception is raised
+    to give the task a chance to clean up."""
+
+    def __str__(self):
+        return "SoftTimeLimitExceeded%s" % (self.args, )
+
+
+class WorkerLostError(Exception):
+    """The worker processing a job has exited prematurely."""
+
+
+class Terminated(Exception):
+    """The worker processing a job has been terminated by user request."""
+
+
+class RestartFreqExceeded(Exception):
+    """Restarts too fast."""
+
+
+class CoroStop(Exception):
+    """Coroutine exit, as opposed to StopIteration which may
+    mean it should be restarted."""
+    pass

venv/lib/python3.12/site-packages/billiard/forkserver.py

@@ -0,0 +1,264 @@
+import errno
+import os
+import selectors
+import signal
+import socket
+import struct
+import sys
+import threading
+
+from . import connection
+from . import process
+from . import reduction
+from . import semaphore_tracker
+from . import spawn
+from . import util
+
+from .compat import spawnv_passfds
+
+__all__ = ['ensure_running', 'get_inherited_fds', 'connect_to_new_process',
+           'set_forkserver_preload']
+
+#
+#
+#
+
+MAXFDS_TO_SEND = 256
+UNSIGNED_STRUCT = struct.Struct('Q')     # large enough for pid_t
+
+#
+# Forkserver class
+#
+
+
+class ForkServer:
+
+    def __init__(self):
+        self._forkserver_address = None
+        self._forkserver_alive_fd = None
+        self._inherited_fds = None
+        self._lock = threading.Lock()
+        self._preload_modules = ['__main__']
+
+    def set_forkserver_preload(self, modules_names):
+        '''Set list of module names to try to load in forkserver process.'''
+        if not all(type(mod) is str for mod in self._preload_modules):
+            raise TypeError('module_names must be a list of strings')
+        self._preload_modules = modules_names
+
+    def get_inherited_fds(self):
+        '''Return list of fds inherited from parent process.
+
+        This returns None if the current process was not started by fork
+        server.
+        '''
+        return self._inherited_fds
+
+    def connect_to_new_process(self, fds):
+        '''Request forkserver to create a child process.
+
+        Returns a pair of fds (status_r, data_w).  The calling process can read
+        the child process's pid and (eventually) its returncode from status_r.
+        The calling process should write to data_w the pickled preparation and
+        process data.
+        '''
+        self.ensure_running()
+        if len(fds) + 4 >= MAXFDS_TO_SEND:
+            raise ValueError('too many fds')
+        with socket.socket(socket.AF_UNIX) as client:
+            client.connect(self._forkserver_address)
+            parent_r, child_w = os.pipe()
+            child_r, parent_w = os.pipe()
+            allfds = [child_r, child_w, self._forkserver_alive_fd,
+                      semaphore_tracker.getfd()]
+            allfds += fds
+            try:
+                reduction.sendfds(client, allfds)
+                return parent_r, parent_w
+            except:
+                os.close(parent_r)
+                os.close(parent_w)
+                raise
+            finally:
+                os.close(child_r)
+                os.close(child_w)
+
+    def ensure_running(self):
+        '''Make sure that a fork server is running.
+
+        This can be called from any process.  Note that usually a child
+        process will just reuse the forkserver started by its parent, so
+        ensure_running() will do nothing.
+        '''
+        with self._lock:
+            semaphore_tracker.ensure_running()
+            if self._forkserver_alive_fd is not None:
+                return
+
+            cmd = ('from billiard.forkserver import main; ' +
+                   'main(%d, %d, %r, **%r)')
+
+            if self._preload_modules:
+                desired_keys = {'main_path', 'sys_path'}
+                data = spawn.get_preparation_data('ignore')
+                data = {
+                    x: y for (x, y) in data.items() if x in desired_keys
+                }
+            else:
+                data = {}
+
+            with socket.socket(socket.AF_UNIX) as listener:
+                address = connection.arbitrary_address('AF_UNIX')
+                listener.bind(address)
+                os.chmod(address, 0o600)
+                listener.listen()
+
+                # all client processes own the write end of the "alive" pipe;
+                # when they all terminate the read end becomes ready.
+                alive_r, alive_w = os.pipe()
+                try:
+                    fds_to_pass = [listener.fileno(), alive_r]
+                    cmd %= (listener.fileno(), alive_r, self._preload_modules,
+                            data)
+                    exe = spawn.get_executable()
+                    args = [exe] + util._args_from_interpreter_flags()
+                    args += ['-c', cmd]
+                    spawnv_passfds(exe, args, fds_to_pass)
+                except:
+                    os.close(alive_w)
+                    raise
+                finally:
+                    os.close(alive_r)
+                self._forkserver_address = address
+                self._forkserver_alive_fd = alive_w
+
+#
+#
+#
+
+
+def main(listener_fd, alive_r, preload, main_path=None, sys_path=None):
+    '''Run forkserver.'''
+    if preload:
+        if '__main__' in preload and main_path is not None:
+            process.current_process()._inheriting = True
+            try:
+                spawn.import_main_path(main_path)
+            finally:
+                del process.current_process()._inheriting
+        for modname in preload:
+            try:
+                __import__(modname)
+            except ImportError:
+                pass
+
+    # close sys.stdin
+    if sys.stdin is not None:
+        try:
+            sys.stdin.close()
+            sys.stdin = open(os.devnull)
+        except (OSError, ValueError):
+            pass
+
+    # ignoring SIGCHLD means no need to reap zombie processes
+    handler = signal.signal(signal.SIGCHLD, signal.SIG_IGN)
+    with socket.socket(socket.AF_UNIX, fileno=listener_fd) as listener, \
+            selectors.DefaultSelector() as selector:
+        _forkserver._forkserver_address = listener.getsockname()
+        selector.register(listener, selectors.EVENT_READ)
+        selector.register(alive_r, selectors.EVENT_READ)
+
+        while True:
+            try:
+                while True:
+                    rfds = [key.fileobj for (key, events) in selector.select()]
+                    if rfds:
+                        break
+
+                if alive_r in rfds:
+                    # EOF because no more client processes left
+                    assert os.read(alive_r, 1) == b''
+                    raise SystemExit
+
+                assert listener in rfds
+                with listener.accept()[0] as s:
+                    code = 1
+                    if os.fork() == 0:
+                        try:
+                            _serve_one(s, listener, alive_r, handler)
+                        except Exception:
+                            sys.excepthook(*sys.exc_info())
+                            sys.stderr.flush()
+                        finally:
+                            os._exit(code)
+            except OSError as e:
+                if e.errno != errno.ECONNABORTED:
+                    raise
+
+
+def __unpack_fds(child_r, child_w, alive, stfd, *inherited):
+    return child_r, child_w, alive, stfd, inherited
+
+
+def _serve_one(s, listener, alive_r, handler):
+    # close unnecessary stuff and reset SIGCHLD handler
+    listener.close()
+    os.close(alive_r)
+    signal.signal(signal.SIGCHLD, handler)
+
+    # receive fds from parent process
+    fds = reduction.recvfds(s, MAXFDS_TO_SEND + 1)
+    s.close()
+    assert len(fds) <= MAXFDS_TO_SEND
+
+    (child_r, child_w, _forkserver._forkserver_alive_fd,
+     stfd, _forkserver._inherited_fds) = __unpack_fds(*fds)
+    semaphore_tracker._semaphore_tracker._fd = stfd
+
+    # send pid to client processes
+    write_unsigned(child_w, os.getpid())
+
+    # reseed random number generator
+    if 'random' in sys.modules:
+        import random
+        random.seed()
+
+    # run process object received over pipe
+    code = spawn._main(child_r)
+
+    # write the exit code to the pipe
+    write_unsigned(child_w, code)
+
+#
+# Read and write unsigned numbers
+#
+
+
+def read_unsigned(fd):
+    data = b''
+    length = UNSIGNED_STRUCT.size
+    while len(data) < length:
+        s = os.read(fd, length - len(data))
+        if not s:
+            raise EOFError('unexpected EOF')
+        data += s
+    return UNSIGNED_STRUCT.unpack(data)[0]
+
+
+def write_unsigned(fd, n):
+    msg = UNSIGNED_STRUCT.pack(n)
+    while msg:
+        nbytes = os.write(fd, msg)
+        if nbytes == 0:
+            raise RuntimeError('should not get here')
+        msg = msg[nbytes:]
+
+#
+#
+#
+
+_forkserver = ForkServer()
+ensure_running = _forkserver.ensure_running
+get_inherited_fds = _forkserver.get_inherited_fds
+connect_to_new_process = _forkserver.connect_to_new_process
+set_forkserver_preload = _forkserver.set_forkserver_preload

venv/lib/python3.12/site-packages/billiard/heap.py

@@ -0,0 +1,285 @@
+#
+# Module which supports allocation of memory from an mmap
+#
+# multiprocessing/heap.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import bisect
+import errno
+import io
+import mmap
+import os
+import sys
+import threading
+import tempfile
+
+from . import context
+from . import reduction
+from . import util
+
+from ._ext import _billiard, win32
+
+__all__ = ['BufferWrapper']
+
+PY3 = sys.version_info[0] == 3
+
+#
+# Inheritable class which wraps an mmap, and from which blocks can be allocated
+#
+
+if sys.platform == 'win32':
+
+    class Arena:
+
+        _rand = tempfile._RandomNameSequence()
+
+        def __init__(self, size):
+            self.size = size
+            for i in range(100):
+                name = 'pym-%d-%s' % (os.getpid(), next(self._rand))
+                buf = mmap.mmap(-1, size, tagname=name)
+                if win32.GetLastError() == 0:
+                    break
+                # we have reopened a preexisting map
+                buf.close()
+            else:
+                exc = IOError('Cannot find name for new mmap')
+                exc.errno = errno.EEXIST
+                raise exc
+            self.name = name
+            self.buffer = buf
+            self._state = (self.size, self.name)
+
+        def __getstate__(self):
+            context.assert_spawning(self)
+            return self._state
+
+        def __setstate__(self, state):
+            self.size, self.name = self._state = state
+            self.buffer = mmap.mmap(-1, self.size, tagname=self.name)
+            # XXX Temporarily preventing buildbot failures while determining
+            # XXX the correct long-term fix. See issue #23060
+            # assert win32.GetLastError() == win32.ERROR_ALREADY_EXISTS
+
+else:
+
+    class Arena:
+
+        def __init__(self, size, fd=-1):
+            self.size = size
+            self.fd = fd
+            if fd == -1:
+                if PY3:
+                    self.fd, name = tempfile.mkstemp(
+                        prefix='pym-%d-' % (os.getpid(),),
+                        dir=util.get_temp_dir(),
+                    )
+
+                    os.unlink(name)
+                    util.Finalize(self, os.close, (self.fd,))
+                    with io.open(self.fd, 'wb', closefd=False) as f:
+                        bs = 1024 * 1024
+                        if size >= bs:
+                            zeros = b'\0' * bs
+                            for _ in range(size // bs):
+                                f.write(zeros)
+                            del(zeros)
+                        f.write(b'\0' * (size % bs))
+                        assert f.tell() == size
+                else:
+                    self.fd, name = tempfile.mkstemp(
+                        prefix='pym-%d-' % (os.getpid(),),
+                        dir=util.get_temp_dir(),
+                    )
+                    os.unlink(name)
+                    util.Finalize(self, os.close, (self.fd,))
+                    os.ftruncate(self.fd, size)
+            self.buffer = mmap.mmap(self.fd, self.size)
+
+    def reduce_arena(a):
+        if a.fd == -1:
+            raise ValueError('Arena is unpicklable because'
+                             'forking was enabled when it was created')
+        return rebuild_arena, (a.size, reduction.DupFd(a.fd))
+
+    def rebuild_arena(size, dupfd):
+        return Arena(size, dupfd.detach())
+
+    reduction.register(Arena, reduce_arena)
+
+#
+# Class allowing allocation of chunks of memory from arenas
+#
+
+
+class Heap:
+
+    _alignment = 8
+
+    def __init__(self, size=mmap.PAGESIZE):
+        self._lastpid = os.getpid()
+        self._lock = threading.Lock()
+        self._size = size
+        self._lengths = []
+        self._len_to_seq = {}
+        self._start_to_block = {}
+        self._stop_to_block = {}
+        self._allocated_blocks = set()
+        self._arenas = []
+        # list of pending blocks to free - see free() comment below
+        self._pending_free_blocks = []
+
+    @staticmethod
+    def _roundup(n, alignment):
+        # alignment must be a power of 2
+        mask = alignment - 1
+        return (n + mask) & ~mask
+
+    def _malloc(self, size):
+        # returns a large enough block -- it might be much larger
+        i = bisect.bisect_left(self._lengths, size)
+        if i == len(self._lengths):
+            length = self._roundup(max(self._size, size), mmap.PAGESIZE)
+            self._size *= 2
+            util.info('allocating a new mmap of length %d', length)
+            arena = Arena(length)
+            self._arenas.append(arena)
+            return (arena, 0, length)
+        else:
+            length = self._lengths[i]
+            seq = self._len_to_seq[length]
+            block = seq.pop()
+            if not seq:
+                del self._len_to_seq[length], self._lengths[i]
+
+        (arena, start, stop) = block
+        del self._start_to_block[(arena, start)]
+        del self._stop_to_block[(arena, stop)]
+        return block
+
+    def _free(self, block):
+        # free location and try to merge with neighbours
+        (arena, start, stop) = block
+
+        try:
+            prev_block = self._stop_to_block[(arena, start)]
+        except KeyError:
+            pass
+        else:
+            start, _ = self._absorb(prev_block)
+
+        try:
+            next_block = self._start_to_block[(arena, stop)]
+        except KeyError:
+            pass
+        else:
+            _, stop = self._absorb(next_block)
+
+        block = (arena, start, stop)
+        length = stop - start
+
+        try:
+            self._len_to_seq[length].append(block)
+        except KeyError:
+            self._len_to_seq[length] = [block]
+            bisect.insort(self._lengths, length)
+
+        self._start_to_block[(arena, start)] = block
+        self._stop_to_block[(arena, stop)] = block
+
+    def _absorb(self, block):
+        # deregister this block so it can be merged with a neighbour
+        (arena, start, stop) = block
+        del self._start_to_block[(arena, start)]
+        del self._stop_to_block[(arena, stop)]
+
+        length = stop - start
+        seq = self._len_to_seq[length]
+        seq.remove(block)
+        if not seq:
+            del self._len_to_seq[length]
+            self._lengths.remove(length)
+
+        return start, stop
+
+    def _free_pending_blocks(self):
+        # Free all the blocks in the pending list - called with the lock held
+        while 1:
+            try:
+                block = self._pending_free_blocks.pop()
+            except IndexError:
+                break
+            self._allocated_blocks.remove(block)
+            self._free(block)
+
+    def free(self, block):
+        # free a block returned by malloc()
+        # Since free() can be called asynchronously by the GC, it could happen
+        # that it's called while self._lock is held: in that case,
+        # self._lock.acquire() would deadlock (issue #12352). To avoid that, a
+        # trylock is used instead, and if the lock can't be acquired
+        # immediately, the block is added to a list of blocks to be freed
+        # synchronously sometimes later from malloc() or free(), by calling
+        # _free_pending_blocks() (appending and retrieving from a list is not
+        # strictly thread-safe but under cPython it's atomic
+        # thanks to the GIL).
+        assert os.getpid() == self._lastpid
+        if not self._lock.acquire(False):
+            # can't acquire the lock right now, add the block to the list of
+            # pending blocks to free
+            self._pending_free_blocks.append(block)
+        else:
+            # we hold the lock
+            try:
+                self._free_pending_blocks()
+                self._allocated_blocks.remove(block)
+                self._free(block)
+            finally:
+                self._lock.release()
+
+    def malloc(self, size):
+        # return a block of right size (possibly rounded up)
+        assert 0 <= size < sys.maxsize
+        if os.getpid() != self._lastpid:
+            self.__init__()                     # reinitialize after fork
+        with self._lock:
+            self._free_pending_blocks()
+            size = self._roundup(max(size, 1), self._alignment)
+            (arena, start, stop) = self._malloc(size)
+            new_stop = start + size
+            if new_stop < stop:
+                self._free((arena, new_stop, stop))
+            block = (arena, start, new_stop)
+            self._allocated_blocks.add(block)
+            return block
+
+#
+# Class representing a chunk of an mmap -- can be inherited
+#
+
+
+class BufferWrapper:
+
+    _heap = Heap()
+
+    def __init__(self, size):
+        assert 0 <= size < sys.maxsize
+        block = BufferWrapper._heap.malloc(size)
+        self._state = (block, size)
+        util.Finalize(self, BufferWrapper._heap.free, args=(block,))
+
+    def get_address(self):
+        (arena, start, stop), size = self._state
+        address, length = _billiard.address_of_buffer(arena.buffer)
+        assert size <= length
+        return address + start
+
+    def get_size(self):
+        return self._state[1]
+
+    def create_memoryview(self):
+        (arena, start, stop), size = self._state
+        return memoryview(arena.buffer)[start:start + size]

venv/lib/python3.12/site-packages/billiard/popen_fork.py

@@ -0,0 +1,89 @@
+import os
+import sys
+import errno
+
+from .common import TERM_SIGNAL
+
+__all__ = ['Popen']
+
+#
+# Start child process using fork
+#
+
+
+class Popen:
+    method = 'fork'
+    sentinel = None
+
+    def __init__(self, process_obj):
+        sys.stdout.flush()
+        sys.stderr.flush()
+        self.returncode = None
+        self._launch(process_obj)
+
+    def duplicate_for_child(self, fd):
+        return fd
+
+    def poll(self, flag=os.WNOHANG):
+        if self.returncode is None:
+            while True:
+                try:
+                    pid, sts = os.waitpid(self.pid, flag)
+                except OSError as e:
+                    if e.errno == errno.EINTR:
+                        continue
+                    # Child process not yet created. See #1731717
+                    # e.errno == errno.ECHILD == 10
+                    return None
+                else:
+                    break
+            if pid == self.pid:
+                if os.WIFSIGNALED(sts):
+                    self.returncode = -os.WTERMSIG(sts)
+                else:
+                    assert os.WIFEXITED(sts)
+                    self.returncode = os.WEXITSTATUS(sts)
+        return self.returncode
+
+    def wait(self, timeout=None):
+        if self.returncode is None:
+            if timeout is not None:
+                from .connection import wait
+                if not wait([self.sentinel], timeout):
+                    return None
+            # This shouldn't block if wait() returned successfully.
+            return self.poll(os.WNOHANG if timeout == 0.0 else 0)
+        return self.returncode
+
+    def terminate(self):
+        if self.returncode is None:
+            try:
+                os.kill(self.pid, TERM_SIGNAL)
+            except OSError as exc:
+                if getattr(exc, 'errno', None) != errno.ESRCH:
+                    if self.wait(timeout=0.1) is None:
+                        raise
+
+    def _launch(self, process_obj):
+        code = 1
+        parent_r, child_w = os.pipe()
+        self.pid = os.fork()
+        if self.pid == 0:
+            try:
+                os.close(parent_r)
+                if 'random' in sys.modules:
+                    import random
+                    random.seed()
+                code = process_obj._bootstrap()
+            finally:
+                os._exit(code)
+        else:
+            os.close(child_w)
+            self.sentinel = parent_r
+
+    def close(self):
+        if self.sentinel is not None:
+            try:
+                os.close(self.sentinel)
+            finally:
+                self.sentinel = None

venv/lib/python3.12/site-packages/billiard/popen_forkserver.py

@@ -0,0 +1,68 @@
+import io
+import os
+
+from . import reduction
+from . import context
+from . import forkserver
+from . import popen_fork
+from . import spawn
+
+__all__ = ['Popen']
+
+#
+# Wrapper for an fd used while launching a process
+#
+
+
+class _DupFd:
+
+    def __init__(self, ind):
+        self.ind = ind
+
+    def detach(self):
+        return forkserver.get_inherited_fds()[self.ind]
+
+#
+# Start child process using a server process
+#
+
+
+class Popen(popen_fork.Popen):
+    method = 'forkserver'
+    DupFd = _DupFd
+
+    def __init__(self, process_obj):
+        self._fds = []
+        super().__init__(process_obj)
+
+    def duplicate_for_child(self, fd):
+        self._fds.append(fd)
+        return len(self._fds) - 1
+
+    def _launch(self, process_obj):
+        prep_data = spawn.get_preparation_data(process_obj._name)
+        buf = io.BytesIO()
+        context.set_spawning_popen(self)
+        try:
+            reduction.dump(prep_data, buf)
+            reduction.dump(process_obj, buf)
+        finally:
+            context.set_spawning_popen(None)
+
+        self.sentinel, w = forkserver.connect_to_new_process(self._fds)
+        with io.open(w, 'wb', closefd=True) as f:
+            f.write(buf.getbuffer())
+        self.pid = forkserver.read_unsigned(self.sentinel)
+
+    def poll(self, flag=os.WNOHANG):
+        if self.returncode is None:
+            from .connection import wait
+            timeout = 0 if flag == os.WNOHANG else None
+            if not wait([self.sentinel], timeout):
+                return None
+            try:
+                self.returncode = forkserver.read_unsigned(self.sentinel)
+            except (OSError, EOFError):
+                # The process ended abnormally perhaps because of a signal
+                self.returncode = 255
+        return self.returncode

venv/lib/python3.12/site-packages/billiard/popen_spawn_posix.py

@@ -0,0 +1,74 @@
+import io
+import os
+
+from . import context
+from . import popen_fork
+from . import reduction
+from . import spawn
+
+from .compat import spawnv_passfds
+
+__all__ = ['Popen']
+
+
+#
+# Wrapper for an fd used while launching a process
+#
+
+class _DupFd:
+
+    def __init__(self, fd):
+        self.fd = fd
+
+    def detach(self):
+        return self.fd
+
+#
+# Start child process using a fresh interpreter
+#
+
+
+class Popen(popen_fork.Popen):
+    method = 'spawn'
+    DupFd = _DupFd
+
+    def __init__(self, process_obj):
+        self._fds = []
+        super().__init__(process_obj)
+
+    def duplicate_for_child(self, fd):
+        self._fds.append(fd)
+        return fd
+
+    def _launch(self, process_obj):
+        os.environ["MULTIPROCESSING_FORKING_DISABLE"] = "1"
+        spawn._Django_old_layout_hack__save()
+        from . import semaphore_tracker
+        tracker_fd = semaphore_tracker.getfd()
+        self._fds.append(tracker_fd)
+        prep_data = spawn.get_preparation_data(process_obj._name)
+        fp = io.BytesIO()
+        context.set_spawning_popen(self)
+        try:
+            reduction.dump(prep_data, fp)
+            reduction.dump(process_obj, fp)
+        finally:
+            context.set_spawning_popen(None)
+
+        parent_r = child_w = child_r = parent_w = None
+        try:
+            parent_r, child_w = os.pipe()
+            child_r, parent_w = os.pipe()
+            cmd = spawn.get_command_line(tracker_fd=tracker_fd,
+                                         pipe_handle=child_r)
+            self._fds.extend([child_r, child_w])
+            self.pid = spawnv_passfds(
+                spawn.get_executable(), cmd, self._fds,
+            )
+            self.sentinel = parent_r
+            with io.open(parent_w, 'wb', closefd=False) as f:
+                f.write(fp.getvalue())
+        finally:
+            for fd in (child_r, child_w, parent_w):
+                if fd is not None:
+                    os.close(fd)

venv/lib/python3.12/site-packages/billiard/popen_spawn_win32.py

@@ -0,0 +1,121 @@
+import io
+import os
+import msvcrt
+import signal
+import sys
+
+from . import context
+from . import spawn
+from . import reduction
+
+from .compat import _winapi
+
+__all__ = ['Popen']
+
+#
+#
+#
+
+TERMINATE = 0x10000
+WINEXE = (sys.platform == 'win32' and getattr(sys, 'frozen', False))
+WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")
+
+#
+# We define a Popen class similar to the one from subprocess, but
+# whose constructor takes a process object as its argument.
+#
+
+
+if sys.platform == 'win32':
+    try:
+        from _winapi import CreateProcess, GetExitCodeProcess
+        close_thread_handle = _winapi.CloseHandle
+    except ImportError:  # Py2.7
+        from _subprocess import CreateProcess, GetExitCodeProcess
+
+        def close_thread_handle(handle):
+            handle.Close()
+
+
+class Popen:
+    '''
+    Start a subprocess to run the code of a process object
+    '''
+    method = 'spawn'
+    sentinel = None
+
+    def __init__(self, process_obj):
+        os.environ["MULTIPROCESSING_FORKING_DISABLE"] = "1"
+        spawn._Django_old_layout_hack__save()
+        prep_data = spawn.get_preparation_data(process_obj._name)
+
+        # read end of pipe will be "stolen" by the child process
+        # -- see spawn_main() in spawn.py.
+        rhandle, whandle = _winapi.CreatePipe(None, 0)
+        wfd = msvcrt.open_osfhandle(whandle, 0)
+        cmd = spawn.get_command_line(parent_pid=os.getpid(),
+                                     pipe_handle=rhandle)
+        cmd = ' '.join('"%s"' % x for x in cmd)
+
+        with io.open(wfd, 'wb', closefd=True) as to_child:
+            # start process
+            try:
+                hp, ht, pid, tid = CreateProcess(
+                    spawn.get_executable(), cmd,
+                    None, None, False, 0, None, None, None)
+                close_thread_handle(ht)
+            except:
+                _winapi.CloseHandle(rhandle)
+                raise
+
+            # set attributes of self
+            self.pid = pid
+            self.returncode = None
+            self._handle = hp
+            self.sentinel = int(hp)
+
+            # send information to child
+            context.set_spawning_popen(self)
+            try:
+                reduction.dump(prep_data, to_child)
+                reduction.dump(process_obj, to_child)
+            finally:
+                context.set_spawning_popen(None)
+
+    def close(self):
+        if self.sentinel is not None:
+            try:
+                _winapi.CloseHandle(self.sentinel)
+            finally:
+                self.sentinel = None
+
+    def duplicate_for_child(self, handle):
+        assert self is context.get_spawning_popen()
+        return reduction.duplicate(handle, self.sentinel)
+
+    def wait(self, timeout=None):
+        if self.returncode is None:
+            if timeout is None:
+                msecs = _winapi.INFINITE
+            else:
+                msecs = max(0, int(timeout * 1000 + 0.5))
+
+            res = _winapi.WaitForSingleObject(int(self._handle), msecs)
+            if res == _winapi.WAIT_OBJECT_0:
+                code = GetExitCodeProcess(self._handle)
+                if code == TERMINATE:
+                    code = -signal.SIGTERM
+                self.returncode = code
+
+        return self.returncode
+
+    def poll(self):
+        return self.wait(timeout=0)
+
+    def terminate(self):
+        if self.returncode is None:
+            try:
+                _winapi.TerminateProcess(int(self._handle), TERMINATE)
+            except OSError:
+                if self.wait(timeout=1.0) is None:
+                    raise

venv/lib/python3.12/site-packages/billiard/process.py

@@ -0,0 +1,400 @@
+#
+# Module providing the `Process` class which emulates `threading.Thread`
+#
+# multiprocessing/process.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+#
+# Imports
+#
+
+import os
+import sys
+import signal
+import itertools
+import logging
+import threading
+from _weakrefset import WeakSet
+
+from multiprocessing import process as _mproc
+
+try:
+    ORIGINAL_DIR = os.path.abspath(os.getcwd())
+except OSError:
+    ORIGINAL_DIR = None
+
+__all__ = ['BaseProcess', 'Process', 'current_process', 'active_children']
+
+#
+# Public functions
+#
+
+
+def current_process():
+    '''
+    Return process object representing the current process
+    '''
+    return _current_process
+
+
+def _set_current_process(process):
+    global _current_process
+    _current_process = _mproc._current_process = process
+
+
+def _cleanup():
+    # check for processes which have finished
+    for p in list(_children):
+        if p._popen.poll() is not None:
+            _children.discard(p)
+
+
+def _maybe_flush(f):
+    try:
+        f.flush()
+    except (AttributeError, EnvironmentError, NotImplementedError):
+        pass
+
+
+def active_children(_cleanup=_cleanup):
+    '''
+    Return list of process objects corresponding to live child processes
+    '''
+    try:
+        _cleanup()
+    except TypeError:
+        # called after gc collect so _cleanup does not exist anymore
+        return []
+    return list(_children)
+
+
+class BaseProcess:
+    '''
+    Process objects represent activity that is run in a separate process
+
+    The class is analogous to `threading.Thread`
+    '''
+
+    def _Popen(self):
+        raise NotImplementedError()
+
+    def __init__(self, group=None, target=None, name=None,
+                 args=(), kwargs={}, daemon=None, **_kw):
+        assert group is None, 'group argument must be None for now'
+        count = next(_process_counter)
+        self._identity = _current_process._identity + (count, )
+        self._config = _current_process._config.copy()
+        self._parent_pid = os.getpid()
+        self._popen = None
+        self._target = target
+        self._args = tuple(args)
+        self._kwargs = dict(kwargs)
+        self._name = (
+            name or type(self).__name__ + '-' +
+            ':'.join(str(i) for i in self._identity)
+        )
+        if daemon is not None:
+            self.daemon = daemon
+        if _dangling is not None:
+            _dangling.add(self)
+        
+        self._controlled_termination = False
+
+    def run(self):
+        '''
+        Method to be run in sub-process; can be overridden in sub-class
+        '''
+        if self._target:
+            self._target(*self._args, **self._kwargs)
+
+    def start(self):
+        '''
+        Start child process
+        '''
+        assert self._popen is None, 'cannot start a process twice'
+        assert self._parent_pid == os.getpid(), \
+            'can only start a process object created by current process'
+        _cleanup()
+        self._popen = self._Popen(self)
+        self._sentinel = self._popen.sentinel
+        _children.add(self)
+
+    def close(self):
+        if self._popen is not None:
+            self._popen.close()
+
+    def terminate(self):
+        '''
+        Terminate process; sends SIGTERM signal or uses TerminateProcess()
+        '''
+        self._popen.terminate()
+        
+    def terminate_controlled(self):
+        self._controlled_termination = True
+        self.terminate()
+
+    def join(self, timeout=None):
+        '''
+        Wait until child process terminates
+        '''
+        assert self._parent_pid == os.getpid(), 'can only join a child process'
+        assert self._popen is not None, 'can only join a started process'
+        res = self._popen.wait(timeout)
+        if res is not None:
+            _children.discard(self)
+            self.close()
+
+    def is_alive(self):
+        '''
+        Return whether process is alive
+        '''
+        if self is _current_process:
+            return True
+        assert self._parent_pid == os.getpid(), 'can only test a child process'
+        if self._popen is None:
+            return False
+        self._popen.poll()
+        return self._popen.returncode is None
+
+    def _is_alive(self):
+        if self._popen is None:
+            return False
+        return self._popen.poll() is None
+
+    @property
+    def name(self):
+        return self._name
+
+    @name.setter
+    def name(self, name):   # noqa
+        assert isinstance(name, str), 'name must be a string'
+        self._name = name
+
+    @property
+    def daemon(self):
+        '''
+        Return whether process is a daemon
+        '''
+        return self._config.get('daemon', False)
+
+    @daemon.setter  # noqa
+    def daemon(self, daemonic):
+        '''
+        Set whether process is a daemon
+        '''
+        assert self._popen is None, 'process has already started'
+        self._config['daemon'] = daemonic
+
+    @property
+    def authkey(self):
+        return self._config['authkey']
+
+    @authkey.setter  # noqa
+    def authkey(self, authkey):
+        '''
+        Set authorization key of process
+        '''
+        self._config['authkey'] = AuthenticationString(authkey)
+
+    @property
+    def exitcode(self):
+        '''
+        Return exit code of process or `None` if it has yet to stop
+        '''
+        if self._popen is None:
+            return self._popen
+        return self._popen.poll()
+
+    @property
+    def ident(self):
+        '''
+        Return identifier (PID) of process or `None` if it has yet to start
+        '''
+        if self is _current_process:
+            return os.getpid()
+        else:
+            return self._popen and self._popen.pid
+
+    pid = ident
+
+    @property
+    def sentinel(self):
+        '''
+        Return a file descriptor (Unix) or handle (Windows) suitable for
+        waiting for process termination.
+        '''
+        try:
+            return self._sentinel
+        except AttributeError:
+            raise ValueError("process not started")
+
+    @property
+    def _counter(self):
+        # compat for 2.7
+        return _process_counter
+
+    @property
+    def _children(self):
+        # compat for 2.7
+        return _children
+
+    @property
+    def _authkey(self):
+        # compat for 2.7
+        return self.authkey
+
+    @property
+    def _daemonic(self):
+        # compat for 2.7
+        return self.daemon
+
+    @property
+    def _tempdir(self):
+        # compat for 2.7
+        return self._config.get('tempdir')
+
+    def __repr__(self):
+        if self is _current_process:
+            status = 'started'
+        elif self._parent_pid != os.getpid():
+            status = 'unknown'
+        elif self._popen is None:
+            status = 'initial'
+        else:
+            if self._popen.poll() is not None:
+                status = self.exitcode
+            else:
+                status = 'started'
+
+        if type(status) is int:
+            if status == 0:
+                status = 'stopped'
+            else:
+                status = 'stopped[%s]' % _exitcode_to_name.get(status, status)
+
+        return '<%s(%s, %s%s)>' % (type(self).__name__, self._name,
+                                   status, self.daemon and ' daemon' or '')
+
+    ##
+
+    def _bootstrap(self):
+        from . import util, context
+        global _current_process, _process_counter, _children
+
+        try:
+            if self._start_method is not None:
+                context._force_start_method(self._start_method)
+            _process_counter = itertools.count(1)
+            _children = set()
+            if sys.stdin is not None:
+                try:
+                    sys.stdin.close()
+                    sys.stdin = open(os.devnull)
+                except (EnvironmentError, OSError, ValueError):
+                    pass
+            old_process = _current_process
+            _set_current_process(self)
+
+            # Re-init logging system.
+            # Workaround for https://bugs.python.org/issue6721/#msg140215
+            # Python logging module uses RLock() objects which are broken
+            # after fork. This can result in a deadlock (Celery Issue #496).
+            loggerDict = logging.Logger.manager.loggerDict
+            logger_names = list(loggerDict.keys())
+            logger_names.append(None)  # for root logger
+            for name in logger_names:
+                if not name or not isinstance(loggerDict[name],
+                                              logging.PlaceHolder):
+                    for handler in logging.getLogger(name).handlers:
+                        handler.createLock()
+            logging._lock = threading.RLock()
+
+            try:
+                util._finalizer_registry.clear()
+                util._run_after_forkers()
+            finally:
+                # delay finalization of the old process object until after
+                # _run_after_forkers() is executed
+                del old_process
+            util.info('child process %s calling self.run()', self.pid)
+            try:
+                self.run()
+                exitcode = 0
+            finally:
+                util._exit_function()
+        except SystemExit as exc:
+            if not exc.args:
+                exitcode = 1
+            elif isinstance(exc.args[0], int):
+                exitcode = exc.args[0]
+            else:
+                sys.stderr.write(str(exc.args[0]) + '\n')
+                _maybe_flush(sys.stderr)
+                exitcode = 0 if isinstance(exc.args[0], str) else 1
+        except:
+            exitcode = 1
+            if not util.error('Process %s', self.name, exc_info=True):
+                import traceback
+                sys.stderr.write('Process %s:\n' % self.name)
+                traceback.print_exc()
+        finally:
+            util.info('process %s exiting with exitcode %d',
+                      self.pid, exitcode)
+            _maybe_flush(sys.stdout)
+            _maybe_flush(sys.stderr)
+
+        return exitcode
+
+#
+# We subclass bytes to avoid accidental transmission of auth keys over network
+#
+
+
+class AuthenticationString(bytes):
+
+    def __reduce__(self):
+        from .context import get_spawning_popen
+
+        if get_spawning_popen() is None:
+            raise TypeError(
+                'Pickling an AuthenticationString object is '
+                'disallowed for security reasons')
+        return AuthenticationString, (bytes(self),)
+
+#
+# Create object representing the main process
+#
+
+
+class _MainProcess(BaseProcess):
+
+    def __init__(self):
+        self._identity = ()
+        self._name = 'MainProcess'
+        self._parent_pid = None
+        self._popen = None
+        self._config = {'authkey': AuthenticationString(os.urandom(32)),
+                        'semprefix': '/mp'}
+
+_current_process = _MainProcess()
+_process_counter = itertools.count(1)
+_children = set()
+del _MainProcess
+
+
+Process = BaseProcess
+
+#
+# Give names to some return codes
+#
+
+_exitcode_to_name = {}
+
+for name, signum in signal.__dict__.items():
+    if name[:3] == 'SIG' and '_' not in name:
+        _exitcode_to_name[-signum] = name
+
+# For debug and leak testing
+_dangling = WeakSet()

venv/lib/python3.12/site-packages/billiard/queues.py

@@ -0,0 +1,403 @@
+#
+# Module implementing queues
+#
+# multiprocessing/queues.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import sys
+import os
+import threading
+import collections
+import weakref
+import errno
+
+from . import connection
+from . import context
+
+from .compat import get_errno
+from time import monotonic
+from queue import Empty, Full
+from .util import (
+    debug, error, info, Finalize, register_after_fork, is_exiting,
+)
+from .reduction import ForkingPickler
+
+__all__ = ['Queue', 'SimpleQueue', 'JoinableQueue']
+
+
+class Queue:
+    '''
+    Queue type using a pipe, buffer and thread
+    '''
+    def __init__(self, maxsize=0, *args, **kwargs):
+        try:
+            ctx = kwargs['ctx']
+        except KeyError:
+            raise TypeError('missing 1 required keyword-only argument: ctx')
+        if maxsize <= 0:
+            # Can raise ImportError (see issues #3770 and #23400)
+            from .synchronize import SEM_VALUE_MAX as maxsize  # noqa
+        self._maxsize = maxsize
+        self._reader, self._writer = connection.Pipe(duplex=False)
+        self._rlock = ctx.Lock()
+        self._opid = os.getpid()
+        if sys.platform == 'win32':
+            self._wlock = None
+        else:
+            self._wlock = ctx.Lock()
+        self._sem = ctx.BoundedSemaphore(maxsize)
+        # For use by concurrent.futures
+        self._ignore_epipe = False
+
+        self._after_fork()
+
+        if sys.platform != 'win32':
+            register_after_fork(self, Queue._after_fork)
+
+    def __getstate__(self):
+        context.assert_spawning(self)
+        return (self._ignore_epipe, self._maxsize, self._reader, self._writer,
+                self._rlock, self._wlock, self._sem, self._opid)
+
+    def __setstate__(self, state):
+        (self._ignore_epipe, self._maxsize, self._reader, self._writer,
+         self._rlock, self._wlock, self._sem, self._opid) = state
+        self._after_fork()
+
+    def _after_fork(self):
+        debug('Queue._after_fork()')
+        self._notempty = threading.Condition(threading.Lock())
+        self._buffer = collections.deque()
+        self._thread = None
+        self._jointhread = None
+        self._joincancelled = False
+        self._closed = False
+        self._close = None
+        self._send_bytes = self._writer.send
+        self._recv = self._reader.recv
+        self._send_bytes = self._writer.send_bytes
+        self._recv_bytes = self._reader.recv_bytes
+        self._poll = self._reader.poll
+
+    def put(self, obj, block=True, timeout=None):
+        assert not self._closed
+        if not self._sem.acquire(block, timeout):
+            raise Full
+
+        with self._notempty:
+            if self._thread is None:
+                self._start_thread()
+            self._buffer.append(obj)
+            self._notempty.notify()
+
+    def get(self, block=True, timeout=None):
+        if block and timeout is None:
+            with self._rlock:
+                res = self._recv_bytes()
+            self._sem.release()
+
+        else:
+            if block:
+                deadline = monotonic() + timeout
+            if not self._rlock.acquire(block, timeout):
+                raise Empty
+            try:
+                if block:
+                    timeout = deadline - monotonic()
+                    if timeout < 0 or not self._poll(timeout):
+                        raise Empty
+                elif not self._poll():
+                    raise Empty
+                res = self._recv_bytes()
+                self._sem.release()
+            finally:
+                self._rlock.release()
+        # unserialize the data after having released the lock
+        return ForkingPickler.loads(res)
+
+    def qsize(self):
+        # Raises NotImplementedError on macOS because
+        # of broken sem_getvalue()
+        return self._maxsize - self._sem._semlock._get_value()
+
+    def empty(self):
+        return not self._poll()
+
+    def full(self):
+        return self._sem._semlock._is_zero()
+
+    def get_nowait(self):
+        return self.get(False)
+
+    def put_nowait(self, obj):
+        return self.put(obj, False)
+
+    def close(self):
+        self._closed = True
+        try:
+            self._reader.close()
+        finally:
+            close = self._close
+            if close:
+                self._close = None
+                close()
+
+    def join_thread(self):
+        debug('Queue.join_thread()')
+        assert self._closed
+        if self._jointhread:
+            self._jointhread()
+
+    def cancel_join_thread(self):
+        debug('Queue.cancel_join_thread()')
+        self._joincancelled = True
+        try:
+            self._jointhread.cancel()
+        except AttributeError:
+            pass
+
+    def _start_thread(self):
+        debug('Queue._start_thread()')
+
+        # Start thread which transfers data from buffer to pipe
+        self._buffer.clear()
+        self._thread = threading.Thread(
+            target=Queue._feed,
+            args=(self._buffer, self._notempty, self._send_bytes,
+                  self._wlock, self._writer.close, self._ignore_epipe),
+            name='QueueFeederThread'
+        )
+        self._thread.daemon = True
+
+        debug('doing self._thread.start()')
+        self._thread.start()
+        debug('... done self._thread.start()')
+
+        # On process exit we will wait for data to be flushed to pipe.
+        #
+        # However, if this process created the queue then all
+        # processes which use the queue will be descendants of this
+        # process.  Therefore waiting for the queue to be flushed
+        # is pointless once all the child processes have been joined.
+        created_by_this_process = (self._opid == os.getpid())
+        if not self._joincancelled and not created_by_this_process:
+            self._jointhread = Finalize(
+                self._thread, Queue._finalize_join,
+                [weakref.ref(self._thread)],
+                exitpriority=-5
+            )
+
+        # Send sentinel to the thread queue object when garbage collected
+        self._close = Finalize(
+            self, Queue._finalize_close,
+            [self._buffer, self._notempty],
+            exitpriority=10
+        )
+
+    @staticmethod
+    def _finalize_join(twr):
+        debug('joining queue thread')
+        thread = twr()
+        if thread is not None:
+            thread.join()
+            debug('... queue thread joined')
+        else:
+            debug('... queue thread already dead')
+
+    @staticmethod
+    def _finalize_close(buffer, notempty):
+        debug('telling queue thread to quit')
+        with notempty:
+            buffer.append(_sentinel)
+            notempty.notify()
+
+    @staticmethod
+    def _feed(buffer, notempty, send_bytes, writelock, close, ignore_epipe):
+        debug('starting thread to feed data to pipe')
+
+        nacquire = notempty.acquire
+        nrelease = notempty.release
+        nwait = notempty.wait
+        bpopleft = buffer.popleft
+        sentinel = _sentinel
+        if sys.platform != 'win32':
+            wacquire = writelock.acquire
+            wrelease = writelock.release
+        else:
+            wacquire = None
+
+        try:
+            while 1:
+                nacquire()
+                try:
+                    if not buffer:
+                        nwait()
+                finally:
+                    nrelease()
+                try:
+                    while 1:
+                        obj = bpopleft()
+                        if obj is sentinel:
+                            debug('feeder thread got sentinel -- exiting')
+                            close()
+                            return
+
+                        # serialize the data before acquiring the lock
+                        obj = ForkingPickler.dumps(obj)
+                        if wacquire is None:
+                            send_bytes(obj)
+                        else:
+                            wacquire()
+                            try:
+                                send_bytes(obj)
+                            finally:
+                                wrelease()
+                except IndexError:
+                    pass
+        except Exception as exc:
+            if ignore_epipe and get_errno(exc) == errno.EPIPE:
+                return
+            # Since this runs in a daemon thread the resources it uses
+            # may be become unusable while the process is cleaning up.
+            # We ignore errors which happen after the process has
+            # started to cleanup.
+            try:
+                if is_exiting():
+                    info('error in queue thread: %r', exc, exc_info=True)
+                else:
+                    if not error('error in queue thread: %r', exc,
+                                 exc_info=True):
+                        import traceback
+                        traceback.print_exc()
+            except Exception:
+                pass
+
+_sentinel = object()
+
+
+class JoinableQueue(Queue):
+    '''
+    A queue type which also supports join() and task_done() methods
+
+    Note that if you do not call task_done() for each finished task then
+    eventually the counter's semaphore may overflow causing Bad Things
+    to happen.
+    '''
+
+    def __init__(self, maxsize=0, *args, **kwargs):
+        try:
+            ctx = kwargs['ctx']
+        except KeyError:
+            raise TypeError('missing 1 required keyword argument: ctx')
+        Queue.__init__(self, maxsize, ctx=ctx)
+        self._unfinished_tasks = ctx.Semaphore(0)
+        self._cond = ctx.Condition()
+
+    def __getstate__(self):
+        return Queue.__getstate__(self) + (self._cond, self._unfinished_tasks)
+
+    def __setstate__(self, state):
+        Queue.__setstate__(self, state[:-2])
+        self._cond, self._unfinished_tasks = state[-2:]
+
+    def put(self, obj, block=True, timeout=None):
+        assert not self._closed
+        if not self._sem.acquire(block, timeout):
+            raise Full
+
+        with self._notempty:
+            with self._cond:
+                if self._thread is None:
+                    self._start_thread()
+                self._buffer.append(obj)
+                self._unfinished_tasks.release()
+                self._notempty.notify()
+
+    def task_done(self):
+        with self._cond:
+            if not self._unfinished_tasks.acquire(False):
+                raise ValueError('task_done() called too many times')
+            if self._unfinished_tasks._semlock._is_zero():
+                self._cond.notify_all()
+
+    def join(self):
+        with self._cond:
+            if not self._unfinished_tasks._semlock._is_zero():
+                self._cond.wait()
+
+
+class _SimpleQueue:
+    '''
+    Simplified Queue type -- really just a locked pipe
+    '''
+
+    def __init__(self, rnonblock=False, wnonblock=False, ctx=None):
+        self._reader, self._writer = connection.Pipe(
+            duplex=False, rnonblock=rnonblock, wnonblock=wnonblock,
+        )
+        self._poll = self._reader.poll
+        self._rlock = self._wlock = None
+
+    def empty(self):
+        return not self._poll()
+
+    def __getstate__(self):
+        context.assert_spawning(self)
+        return (self._reader, self._writer, self._rlock, self._wlock)
+
+    def __setstate__(self, state):
+        (self._reader, self._writer, self._rlock, self._wlock) = state
+
+    def get_payload(self):
+        return self._reader.recv_bytes()
+
+    def send_payload(self, value):
+        self._writer.send_bytes(value)
+
+    def get(self):
+        # unserialize the data after having released the lock
+        return ForkingPickler.loads(self.get_payload())
+
+    def put(self, obj):
+        # serialize the data before acquiring the lock
+        self.send_payload(ForkingPickler.dumps(obj))
+
+    def close(self):
+        if self._reader is not None:
+            try:
+                self._reader.close()
+            finally:
+                self._reader = None
+
+        if self._writer is not None:
+            try:
+                self._writer.close()
+            finally:
+                self._writer = None
+
+
+class SimpleQueue(_SimpleQueue):
+
+    def __init__(self, *args, **kwargs):
+        try:
+            ctx = kwargs['ctx']
+        except KeyError:
+            raise TypeError('missing required keyword argument: ctx')
+        self._reader, self._writer = connection.Pipe(duplex=False)
+        self._rlock = ctx.Lock()
+        self._wlock = ctx.Lock() if sys.platform != 'win32' else None
+
+    def get_payload(self):
+        with self._rlock:
+            return self._reader.recv_bytes()
+
+    def send_payload(self, value):
+        if self._wlock is None:
+            # writes to a message oriented win32 pipe are atomic
+            self._writer.send_bytes(value)
+        else:
+            with self._wlock:
+                self._writer.send_bytes(value)

venv/lib/python3.12/site-packages/billiard/reduction.py

@@ -0,0 +1,293 @@
+#
+# Module which deals with pickling of objects.
+#
+# multiprocessing/reduction.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import functools
+import io
+import os
+import pickle
+import socket
+import sys
+
+from . import context
+
+__all__ = ['send_handle', 'recv_handle', 'ForkingPickler', 'register', 'dump']
+
+PY3 = sys.version_info[0] == 3
+
+
+HAVE_SEND_HANDLE = (sys.platform == 'win32' or
+                    (hasattr(socket, 'CMSG_LEN') and
+                     hasattr(socket, 'SCM_RIGHTS') and
+                     hasattr(socket.socket, 'sendmsg')))
+
+#
+# Pickler subclass
+#
+
+
+if PY3:
+    import copyreg
+
+    class ForkingPickler(pickle.Pickler):
+        '''Pickler subclass used by multiprocessing.'''
+        _extra_reducers = {}
+        _copyreg_dispatch_table = copyreg.dispatch_table
+
+        def __init__(self, *args):
+            super(ForkingPickler, self).__init__(*args)
+            self.dispatch_table = self._copyreg_dispatch_table.copy()
+            self.dispatch_table.update(self._extra_reducers)
+
+        @classmethod
+        def register(cls, type, reduce):
+            '''Register a reduce function for a type.'''
+            cls._extra_reducers[type] = reduce
+
+        @classmethod
+        def dumps(cls, obj, protocol=None):
+            buf = io.BytesIO()
+            cls(buf, protocol).dump(obj)
+            return buf.getbuffer()
+
+        @classmethod
+        def loadbuf(cls, buf, protocol=None):
+            return cls.loads(buf.getbuffer())
+
+        loads = pickle.loads
+
+else:
+
+    class ForkingPickler(pickle.Pickler):  # noqa
+        '''Pickler subclass used by multiprocessing.'''
+        dispatch = pickle.Pickler.dispatch.copy()
+
+        @classmethod
+        def register(cls, type, reduce):
+            '''Register a reduce function for a type.'''
+            def dispatcher(self, obj):
+                rv = reduce(obj)
+                self.save_reduce(obj=obj, *rv)
+            cls.dispatch[type] = dispatcher
+
+        @classmethod
+        def dumps(cls, obj, protocol=None):
+            buf = io.BytesIO()
+            cls(buf, protocol).dump(obj)
+            return buf.getvalue()
+
+        @classmethod
+        def loadbuf(cls, buf, protocol=None):
+            return cls.loads(buf.getvalue())
+
+        @classmethod
+        def loads(cls, buf, loads=pickle.loads):
+            if isinstance(buf, io.BytesIO):
+                buf = buf.getvalue()
+            return loads(buf)
+register = ForkingPickler.register
+
+
+def dump(obj, file, protocol=None):
+    '''Replacement for pickle.dump() using ForkingPickler.'''
+    ForkingPickler(file, protocol).dump(obj)
+
+#
+# Platform specific definitions
+#
+
+if sys.platform == 'win32':
+    # Windows
+    __all__ += ['DupHandle', 'duplicate', 'steal_handle']
+    from .compat import _winapi
+
+    def duplicate(handle, target_process=None, inheritable=False):
+        '''Duplicate a handle.  (target_process is a handle not a pid!)'''
+        if target_process is None:
+            target_process = _winapi.GetCurrentProcess()
+        return _winapi.DuplicateHandle(
+            _winapi.GetCurrentProcess(), handle, target_process,
+            0, inheritable, _winapi.DUPLICATE_SAME_ACCESS)
+
+    def steal_handle(source_pid, handle):
+        '''Steal a handle from process identified by source_pid.'''
+        source_process_handle = _winapi.OpenProcess(
+            _winapi.PROCESS_DUP_HANDLE, False, source_pid)
+        try:
+            return _winapi.DuplicateHandle(
+                source_process_handle, handle,
+                _winapi.GetCurrentProcess(), 0, False,
+                _winapi.DUPLICATE_SAME_ACCESS | _winapi.DUPLICATE_CLOSE_SOURCE)
+        finally:
+            _winapi.CloseHandle(source_process_handle)
+
+    def send_handle(conn, handle, destination_pid):
+        '''Send a handle over a local connection.'''
+        dh = DupHandle(handle, _winapi.DUPLICATE_SAME_ACCESS, destination_pid)
+        conn.send(dh)
+
+    def recv_handle(conn):
+        '''Receive a handle over a local connection.'''
+        return conn.recv().detach()
+
+    class DupHandle:
+        '''Picklable wrapper for a handle.'''
+        def __init__(self, handle, access, pid=None):
+            if pid is None:
+                # We just duplicate the handle in the current process and
+                # let the receiving process steal the handle.
+                pid = os.getpid()
+            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False, pid)
+            try:
+                self._handle = _winapi.DuplicateHandle(
+                    _winapi.GetCurrentProcess(),
+                    handle, proc, access, False, 0)
+            finally:
+                _winapi.CloseHandle(proc)
+            self._access = access
+            self._pid = pid
+
+        def detach(self):
+            '''Get the handle.  This should only be called once.'''
+            # retrieve handle from process which currently owns it
+            if self._pid == os.getpid():
+                # The handle has already been duplicated for this process.
+                return self._handle
+            # We must steal the handle from the process whose pid is self._pid.
+            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False,
+                                       self._pid)
+            try:
+                return _winapi.DuplicateHandle(
+                    proc, self._handle, _winapi.GetCurrentProcess(),
+                    self._access, False, _winapi.DUPLICATE_CLOSE_SOURCE)
+            finally:
+                _winapi.CloseHandle(proc)
+
+else:
+    # Unix
+    __all__ += ['DupFd', 'sendfds', 'recvfds']
+    import array
+
+    # On macOS we should acknowledge receipt of fds -- see Issue14669
+    ACKNOWLEDGE = sys.platform == 'darwin'
+
+    def sendfds(sock, fds):
+        '''Send an array of fds over an AF_UNIX socket.'''
+        fds = array.array('i', fds)
+        msg = bytes([len(fds) % 256])
+        sock.sendmsg([msg], [(socket.SOL_SOCKET, socket.SCM_RIGHTS, fds)])
+        if ACKNOWLEDGE and sock.recv(1) != b'A':
+            raise RuntimeError('did not receive acknowledgement of fd')
+
+    def recvfds(sock, size):
+        '''Receive an array of fds over an AF_UNIX socket.'''
+        a = array.array('i')
+        bytes_size = a.itemsize * size
+        msg, ancdata, flags, addr = sock.recvmsg(
+            1, socket.CMSG_LEN(bytes_size),
+        )
+        if not msg and not ancdata:
+            raise EOFError
+        try:
+            if ACKNOWLEDGE:
+                sock.send(b'A')
+            if len(ancdata) != 1:
+                raise RuntimeError(
+                    'received %d items of ancdata' % len(ancdata),
+                )
+            cmsg_level, cmsg_type, cmsg_data = ancdata[0]
+            if (cmsg_level == socket.SOL_SOCKET and
+                    cmsg_type == socket.SCM_RIGHTS):
+                if len(cmsg_data) % a.itemsize != 0:
+                    raise ValueError
+                a.frombytes(cmsg_data)
+                assert len(a) % 256 == msg[0]
+                return list(a)
+        except (ValueError, IndexError):
+            pass
+        raise RuntimeError('Invalid data received')
+
+    def send_handle(conn, handle, destination_pid):  # noqa
+        '''Send a handle over a local connection.'''
+        fd = conn.fileno()
+        with socket.fromfd(fd, socket.AF_UNIX, socket.SOCK_STREAM) as s:
+            sendfds(s, [handle])
+
+    def recv_handle(conn):  # noqa
+        '''Receive a handle over a local connection.'''
+        fd = conn.fileno()
+        with socket.fromfd(fd, socket.AF_UNIX, socket.SOCK_STREAM) as s:
+            return recvfds(s, 1)[0]
+
+    def DupFd(fd):
+        '''Return a wrapper for an fd.'''
+        popen_obj = context.get_spawning_popen()
+        if popen_obj is not None:
+            return popen_obj.DupFd(popen_obj.duplicate_for_child(fd))
+        elif HAVE_SEND_HANDLE:
+            from . import resource_sharer
+            return resource_sharer.DupFd(fd)
+        else:
+            raise ValueError('SCM_RIGHTS appears not to be available')
+
+#
+# Try making some callable types picklable
+#
+
+
+def _reduce_method(m):
+    if m.__self__ is None:
+        return getattr, (m.__class__, m.__func__.__name__)
+    else:
+        return getattr, (m.__self__, m.__func__.__name__)
+
+
+class _C:
+    def f(self):
+        pass
+register(type(_C().f), _reduce_method)
+
+
+def _reduce_method_descriptor(m):
+    return getattr, (m.__objclass__, m.__name__)
+register(type(list.append), _reduce_method_descriptor)
+register(type(int.__add__), _reduce_method_descriptor)
+
+
+def _reduce_partial(p):
+    return _rebuild_partial, (p.func, p.args, p.keywords or {})
+
+
+def _rebuild_partial(func, args, keywords):
+    return functools.partial(func, *args, **keywords)
+register(functools.partial, _reduce_partial)
+
+#
+# Make sockets picklable
+#
+
+if sys.platform == 'win32':
+
+    def _reduce_socket(s):
+        from .resource_sharer import DupSocket
+        return _rebuild_socket, (DupSocket(s),)
+
+    def _rebuild_socket(ds):
+        return ds.detach()
+    register(socket.socket, _reduce_socket)
+
+else:
+
+    def _reduce_socket(s):  # noqa
+        df = DupFd(s.fileno())
+        return _rebuild_socket, (df, s.family, s.type, s.proto)
+
+    def _rebuild_socket(df, family, type, proto):  # noqa
+        fd = df.detach()
+        return socket.socket(family, type, proto, fileno=fd)
+    register(socket.socket, _reduce_socket)

venv/lib/python3.12/site-packages/billiard/resource_sharer.py

@@ -0,0 +1,162 @@
+#
+# We use a background thread for sharing fds on Unix, and for sharing
+# sockets on Windows.
+#
+# A client which wants to pickle a resource registers it with the resource
+# sharer and gets an identifier in return.  The unpickling process will connect
+# to the resource sharer, sends the identifier and its pid, and then receives
+# the resource.
+#
+
+import os
+import signal
+import socket
+import sys
+import threading
+
+from . import process
+from . import reduction
+from . import util
+
+__all__ = ['stop']
+
+
+if sys.platform == 'win32':
+    __all__ += ['DupSocket']
+
+    class DupSocket:
+        '''Picklable wrapper for a socket.'''
+
+        def __init__(self, sock):
+            new_sock = sock.dup()
+
+            def send(conn, pid):
+                share = new_sock.share(pid)
+                conn.send_bytes(share)
+            self._id = _resource_sharer.register(send, new_sock.close)
+
+        def detach(self):
+            '''Get the socket.  This should only be called once.'''
+            with _resource_sharer.get_connection(self._id) as conn:
+                share = conn.recv_bytes()
+                return socket.fromshare(share)
+
+else:
+    __all__ += ['DupFd']
+
+    class DupFd:
+        '''Wrapper for fd which can be used at any time.'''
+        def __init__(self, fd):
+            new_fd = os.dup(fd)
+
+            def send(conn, pid):
+                reduction.send_handle(conn, new_fd, pid)
+
+            def close():
+                os.close(new_fd)
+            self._id = _resource_sharer.register(send, close)
+
+        def detach(self):
+            '''Get the fd.  This should only be called once.'''
+            with _resource_sharer.get_connection(self._id) as conn:
+                return reduction.recv_handle(conn)
+
+
+class _ResourceSharer:
+    '''Manager for resources using background thread.'''
+    def __init__(self):
+        self._key = 0
+        self._cache = {}
+        self._old_locks = []
+        self._lock = threading.Lock()
+        self._listener = None
+        self._address = None
+        self._thread = None
+        util.register_after_fork(self, _ResourceSharer._afterfork)
+
+    def register(self, send, close):
+        '''Register resource, returning an identifier.'''
+        with self._lock:
+            if self._address is None:
+                self._start()
+            self._key += 1
+            self._cache[self._key] = (send, close)
+            return (self._address, self._key)
+
+    @staticmethod
+    def get_connection(ident):
+        '''Return connection from which to receive identified resource.'''
+        from .connection import Client
+        address, key = ident
+        c = Client(address, authkey=process.current_process().authkey)
+        c.send((key, os.getpid()))
+        return c
+
+    def stop(self, timeout=None):
+        '''Stop the background thread and clear registered resources.'''
+        from .connection import Client
+        with self._lock:
+            if self._address is not None:
+                c = Client(self._address,
+                           authkey=process.current_process().authkey)
+                c.send(None)
+                c.close()
+                self._thread.join(timeout)
+                if self._thread.is_alive():
+                    util.sub_warning('_ResourceSharer thread did '
+                                     'not stop when asked')
+                self._listener.close()
+                self._thread = None
+                self._address = None
+                self._listener = None
+                for key, (send, close) in self._cache.items():
+                    close()
+                self._cache.clear()
+
+    def _afterfork(self):
+        for key, (send, close) in self._cache.items():
+            close()
+        self._cache.clear()
+        # If self._lock was locked at the time of the fork, it may be broken
+        # -- see issue 6721.  Replace it without letting it be gc'ed.
+        self._old_locks.append(self._lock)
+        self._lock = threading.Lock()
+        if self._listener is not None:
+            self._listener.close()
+        self._listener = None
+        self._address = None
+        self._thread = None
+
+    def _start(self):
+        from .connection import Listener
+        assert self._listener is None
+        util.debug('starting listener and thread for sending handles')
+        self._listener = Listener(authkey=process.current_process().authkey)
+        self._address = self._listener.address
+        t = threading.Thread(target=self._serve)
+        t.daemon = True
+        t.start()
+        self._thread = t
+
+    def _serve(self):
+        if hasattr(signal, 'pthread_sigmask'):
+            signal.pthread_sigmask(signal.SIG_BLOCK, range(1, signal.NSIG))
+        while 1:
+            try:
+                with self._listener.accept() as conn:
+                    msg = conn.recv()
+                    if msg is None:
+                        break
+                    key, destination_pid = msg
+                    send, close = self._cache.pop(key)
+                    try:
+                        send(conn, destination_pid)
+                    finally:
+                        close()
+            except:
+                if not util.is_exiting():
+                    sys.excepthook(*sys.exc_info())
+
+
+_resource_sharer = _ResourceSharer()
+stop = _resource_sharer.stop

venv/lib/python3.12/site-packages/billiard/semaphore_tracker.py

@@ -0,0 +1,146 @@
+#
+# On Unix we run a server process which keeps track of unlinked
+# semaphores. The server ignores SIGINT and SIGTERM and reads from a
+# pipe.  Every other process of the program has a copy of the writable
+# end of the pipe, so we get EOF when all other processes have exited.
+# Then the server process unlinks any remaining semaphore names.
+#
+# This is important because the system only supports a limited number
+# of named semaphores, and they will not be automatically removed till
+# the next reboot.  Without this semaphore tracker process, "killall
+# python" would probably leave unlinked semaphores.
+#
+
+import io
+import os
+import signal
+import sys
+import threading
+import warnings
+from ._ext import _billiard
+
+from . import spawn
+from . import util
+
+from .compat import spawnv_passfds
+
+__all__ = ['ensure_running', 'register', 'unregister']
+
+
+class SemaphoreTracker:
+
+    def __init__(self):
+        self._lock = threading.Lock()
+        self._fd = None
+
+    def getfd(self):
+        self.ensure_running()
+        return self._fd
+
+    def ensure_running(self):
+        '''Make sure that semaphore tracker process is running.
+
+        This can be run from any process.  Usually a child process will use
+        the semaphore created by its parent.'''
+        with self._lock:
+            if self._fd is not None:
+                return
+            fds_to_pass = []
+            try:
+                fds_to_pass.append(sys.stderr.fileno())
+            except Exception:
+                pass
+            cmd = 'from billiard.semaphore_tracker import main;main(%d)'
+            r, w = os.pipe()
+            try:
+                fds_to_pass.append(r)
+                # process will out live us, so no need to wait on pid
+                exe = spawn.get_executable()
+                args = [exe] + util._args_from_interpreter_flags()
+                args += ['-c', cmd % r]
+                spawnv_passfds(exe, args, fds_to_pass)
+            except:
+                os.close(w)
+                raise
+            else:
+                self._fd = w
+            finally:
+                os.close(r)
+
+    def register(self, name):
+        '''Register name of semaphore with semaphore tracker.'''
+        self._send('REGISTER', name)
+
+    def unregister(self, name):
+        '''Unregister name of semaphore with semaphore tracker.'''
+        self._send('UNREGISTER', name)
+
+    def _send(self, cmd, name):
+        self.ensure_running()
+        msg = '{0}:{1}\n'.format(cmd, name).encode('ascii')
+        if len(name) > 512:
+            # posix guarantees that writes to a pipe of less than PIPE_BUF
+            # bytes are atomic, and that PIPE_BUF >= 512
+            raise ValueError('name too long')
+        nbytes = os.write(self._fd, msg)
+        assert nbytes == len(msg)
+
+
+_semaphore_tracker = SemaphoreTracker()
+ensure_running = _semaphore_tracker.ensure_running
+register = _semaphore_tracker.register
+unregister = _semaphore_tracker.unregister
+getfd = _semaphore_tracker.getfd
+
+
+def main(fd):
+    '''Run semaphore tracker.'''
+    # protect the process from ^C and "killall python" etc
+    signal.signal(signal.SIGINT, signal.SIG_IGN)
+    signal.signal(signal.SIGTERM, signal.SIG_IGN)
+
+    for f in (sys.stdin, sys.stdout):
+        try:
+            f.close()
+        except Exception:
+            pass
+
+    cache = set()
+    try:
+        # keep track of registered/unregistered semaphores
+        with io.open(fd, 'rb') as f:
+            for line in f:
+                try:
+                    cmd, name = line.strip().split(b':')
+                    if cmd == b'REGISTER':
+                        cache.add(name)
+                    elif cmd == b'UNREGISTER':
+                        cache.remove(name)
+                    else:
+                        raise RuntimeError('unrecognized command %r' % cmd)
+                except Exception:
+                    try:
+                        sys.excepthook(*sys.exc_info())
+                    except:
+                        pass
+    finally:
+        # all processes have terminated; cleanup any remaining semaphores
+        if cache:
+            try:
+                warnings.warn('semaphore_tracker: There appear to be %d '
+                              'leaked semaphores to clean up at shutdown' %
+                              len(cache))
+            except Exception:
+                pass
+        for name in cache:
+            # For some reason the process which created and registered this
+            # semaphore has failed to unregister it. Presumably it has died.
+            # We therefore unlink it.
+            try:
+                name = name.decode('ascii')
+                try:
+                    _billiard.sem_unlink(name)
+                except Exception as e:
+                    warnings.warn('semaphore_tracker: %r: %s' % (name, e))
+            finally:
+                pass

venv/lib/python3.12/site-packages/billiard/sharedctypes.py

@@ -0,0 +1,258 @@
+#
+# Module which supports allocation of ctypes objects from shared memory
+#
+# multiprocessing/sharedctypes.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import ctypes
+import sys
+import weakref
+
+from . import heap
+from . import get_context
+from .context import assert_spawning
+from .reduction import ForkingPickler
+
+__all__ = ['RawValue', 'RawArray', 'Value', 'Array', 'copy', 'synchronized']
+
+PY3 = sys.version_info[0] == 3
+
+typecode_to_type = {
+    'c': ctypes.c_char, 'u': ctypes.c_wchar,
+    'b': ctypes.c_byte, 'B': ctypes.c_ubyte,
+    'h': ctypes.c_short, 'H': ctypes.c_ushort,
+    'i': ctypes.c_int, 'I': ctypes.c_uint,
+    'l': ctypes.c_long, 'L': ctypes.c_ulong,
+    'f': ctypes.c_float, 'd': ctypes.c_double
+}
+
+
+def _new_value(type_):
+    size = ctypes.sizeof(type_)
+    wrapper = heap.BufferWrapper(size)
+    return rebuild_ctype(type_, wrapper, None)
+
+
+def RawValue(typecode_or_type, *args):
+    '''
+    Returns a ctypes object allocated from shared memory
+    '''
+    type_ = typecode_to_type.get(typecode_or_type, typecode_or_type)
+    obj = _new_value(type_)
+    ctypes.memset(ctypes.addressof(obj), 0, ctypes.sizeof(obj))
+    obj.__init__(*args)
+    return obj
+
+
+def RawArray(typecode_or_type, size_or_initializer):
+    '''
+    Returns a ctypes array allocated from shared memory
+    '''
+    type_ = typecode_to_type.get(typecode_or_type, typecode_or_type)
+    if isinstance(size_or_initializer, int):
+        type_ = type_ * size_or_initializer
+        obj = _new_value(type_)
+        ctypes.memset(ctypes.addressof(obj), 0, ctypes.sizeof(obj))
+        return obj
+    else:
+        type_ = type_ * len(size_or_initializer)
+        result = _new_value(type_)
+        result.__init__(*size_or_initializer)
+        return result
+
+
+def Value(typecode_or_type, *args, **kwds):
+    '''
+    Return a synchronization wrapper for a Value
+    '''
+    lock = kwds.pop('lock', None)
+    ctx = kwds.pop('ctx', None)
+    if kwds:
+        raise ValueError(
+            'unrecognized keyword argument(s): %s' % list(kwds.keys()))
+    obj = RawValue(typecode_or_type, *args)
+    if lock is False:
+        return obj
+    if lock in (True, None):
+        ctx = ctx or get_context()
+        lock = ctx.RLock()
+    if not hasattr(lock, 'acquire'):
+        raise AttributeError("'%r' has no method 'acquire'" % lock)
+    return synchronized(obj, lock, ctx=ctx)
+
+
+def Array(typecode_or_type, size_or_initializer, **kwds):
+    '''
+    Return a synchronization wrapper for a RawArray
+    '''
+    lock = kwds.pop('lock', None)
+    ctx = kwds.pop('ctx', None)
+    if kwds:
+        raise ValueError(
+            'unrecognized keyword argument(s): %s' % list(kwds.keys()))
+    obj = RawArray(typecode_or_type, size_or_initializer)
+    if lock is False:
+        return obj
+    if lock in (True, None):
+        ctx = ctx or get_context()
+        lock = ctx.RLock()
+    if not hasattr(lock, 'acquire'):
+        raise AttributeError("'%r' has no method 'acquire'" % lock)
+    return synchronized(obj, lock, ctx=ctx)
+
+
+def copy(obj):
+    new_obj = _new_value(type(obj))
+    ctypes.pointer(new_obj)[0] = obj
+    return new_obj
+
+
+def synchronized(obj, lock=None, ctx=None):
+    assert not isinstance(obj, SynchronizedBase), 'object already synchronized'
+    ctx = ctx or get_context()
+
+    if isinstance(obj, ctypes._SimpleCData):
+        return Synchronized(obj, lock, ctx)
+    elif isinstance(obj, ctypes.Array):
+        if obj._type_ is ctypes.c_char:
+            return SynchronizedString(obj, lock, ctx)
+        return SynchronizedArray(obj, lock, ctx)
+    else:
+        cls = type(obj)
+        try:
+            scls = class_cache[cls]
+        except KeyError:
+            names = [field[0] for field in cls._fields_]
+            d = dict((name, make_property(name)) for name in names)
+            classname = 'Synchronized' + cls.__name__
+            scls = class_cache[cls] = type(classname, (SynchronizedBase,), d)
+        return scls(obj, lock, ctx)
+
+#
+# Functions for pickling/unpickling
+#
+
+
+def reduce_ctype(obj):
+    assert_spawning(obj)
+    if isinstance(obj, ctypes.Array):
+        return rebuild_ctype, (obj._type_, obj._wrapper, obj._length_)
+    else:
+        return rebuild_ctype, (type(obj), obj._wrapper, None)
+
+
+def rebuild_ctype(type_, wrapper, length):
+    if length is not None:
+        type_ = type_ * length
+    ForkingPickler.register(type_, reduce_ctype)
+    if PY3:
+        buf = wrapper.create_memoryview()
+        obj = type_.from_buffer(buf)
+    else:
+        obj = type_.from_address(wrapper.get_address())
+    obj._wrapper = wrapper
+    return obj
+
+#
+# Function to create properties
+#
+
+
+def make_property(name):
+    try:
+        return prop_cache[name]
+    except KeyError:
+        d = {}
+        exec(template % ((name, ) * 7), d)
+        prop_cache[name] = d[name]
+        return d[name]
+
+
+template = '''
+def get%s(self):
+    self.acquire()
+    try:
+        return self._obj.%s
+    finally:
+        self.release()
+def set%s(self, value):
+    self.acquire()
+    try:
+        self._obj.%s = value
+    finally:
+        self.release()
+%s = property(get%s, set%s)
+'''
+
+prop_cache = {}
+class_cache = weakref.WeakKeyDictionary()
+
+#
+# Synchronized wrappers
+#
+
+
+class SynchronizedBase:
+
+    def __init__(self, obj, lock=None, ctx=None):
+        self._obj = obj
+        if lock:
+            self._lock = lock
+        else:
+            ctx = ctx or get_context(force=True)
+            self._lock = ctx.RLock()
+        self.acquire = self._lock.acquire
+        self.release = self._lock.release
+
+    def __enter__(self):
+        return self._lock.__enter__()
+
+    def __exit__(self, *args):
+        return self._lock.__exit__(*args)
+
+    def __reduce__(self):
+        assert_spawning(self)
+        return synchronized, (self._obj, self._lock)
+
+    def get_obj(self):
+        return self._obj
+
+    def get_lock(self):
+        return self._lock
+
+    def __repr__(self):
+        return '<%s wrapper for %s>' % (type(self).__name__, self._obj)
+
+
+class Synchronized(SynchronizedBase):
+    value = make_property('value')
+
+
+class SynchronizedArray(SynchronizedBase):
+
+    def __len__(self):
+        return len(self._obj)
+
+    def __getitem__(self, i):
+        with self:
+            return self._obj[i]
+
+    def __setitem__(self, i, value):
+        with self:
+            self._obj[i] = value
+
+    def __getslice__(self, start, stop):
+        with self:
+            return self._obj[start:stop]
+
+    def __setslice__(self, start, stop, values):
+        with self:
+            self._obj[start:stop] = values
+
+
+class SynchronizedString(SynchronizedArray):
+    value = make_property('value')
+    raw = make_property('raw')

venv/lib/python3.12/site-packages/billiard/spawn.py

@@ -0,0 +1,389 @@
+#
+# Code used to start processes when using the spawn or forkserver
+# start methods.
+#
+# multiprocessing/spawn.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import io
+import os
+import pickle
+import sys
+import runpy
+import types
+import warnings
+
+from . import get_start_method, set_start_method
+from . import process
+from . import util
+
+__all__ = ['_main', 'freeze_support', 'set_executable', 'get_executable',
+           'get_preparation_data', 'get_command_line', 'import_main_path']
+
+W_OLD_DJANGO_LAYOUT = """\
+Will add directory %r to path! This is necessary to accommodate \
+pre-Django 1.4 layouts using setup_environ.
+You can skip this warning by adding a DJANGO_SETTINGS_MODULE=settings \
+environment variable.
+"""
+
+#
+# _python_exe is the assumed path to the python executable.
+# People embedding Python want to modify it.
+#
+
+if sys.platform != 'win32':
+    WINEXE = False
+    WINSERVICE = False
+else:
+    WINEXE = (sys.platform == 'win32' and getattr(sys, 'frozen', False))
+    WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")
+
+if WINSERVICE:
+    _python_exe = os.path.join(sys.exec_prefix, 'python.exe')
+else:
+    _python_exe = sys.executable
+
+
+def _module_parent_dir(mod):
+    dir, filename = os.path.split(_module_dir(mod))
+    if dir == os.curdir or not dir:
+        dir = os.getcwd()
+    return dir
+
+
+def _module_dir(mod):
+    if '__init__.py' in mod.__file__:
+        return os.path.dirname(mod.__file__)
+    return mod.__file__
+
+
+def _Django_old_layout_hack__save():
+    if 'DJANGO_PROJECT_DIR' not in os.environ:
+        try:
+            settings_name = os.environ['DJANGO_SETTINGS_MODULE']
+        except KeyError:
+            return  # not using Django.
+
+        conf_settings = sys.modules.get('django.conf.settings')
+        configured = conf_settings and conf_settings.configured
+        try:
+            project_name, _ = settings_name.split('.', 1)
+        except ValueError:
+            return  # not modified by setup_environ
+
+        project = __import__(project_name)
+        try:
+            project_dir = os.path.normpath(_module_parent_dir(project))
+        except AttributeError:
+            return  # dynamically generated module (no __file__)
+        if configured:
+            warnings.warn(UserWarning(
+                W_OLD_DJANGO_LAYOUT % os.path.realpath(project_dir)
+            ))
+        os.environ['DJANGO_PROJECT_DIR'] = project_dir
+
+
+def _Django_old_layout_hack__load():
+    try:
+        sys.path.append(os.environ['DJANGO_PROJECT_DIR'])
+    except KeyError:
+        pass
+
+
+def set_executable(exe):
+    global _python_exe
+    _python_exe = exe
+
+
+def get_executable():
+    return _python_exe
+
+#
+#
+#
+
+
+def is_forking(argv):
+    '''
+    Return whether commandline indicates we are forking
+    '''
+    if len(argv) >= 2 and argv[1] == '--billiard-fork':
+        return True
+    else:
+        return False
+
+
+def freeze_support():
+    '''
+    Run code for process object if this in not the main process
+    '''
+    if is_forking(sys.argv):
+        kwds = {}
+        for arg in sys.argv[2:]:
+            name, value = arg.split('=')
+            if value == 'None':
+                kwds[name] = None
+            else:
+                kwds[name] = int(value)
+        spawn_main(**kwds)
+        sys.exit()
+
+
+def get_command_line(**kwds):
+    '''
+    Returns prefix of command line used for spawning a child process
+    '''
+    if getattr(sys, 'frozen', False):
+        return ([sys.executable, '--billiard-fork'] +
+                ['%s=%r' % item for item in kwds.items()])
+    else:
+        prog = 'from billiard.spawn import spawn_main; spawn_main(%s)'
+        prog %= ', '.join('%s=%r' % item for item in kwds.items())
+        opts = util._args_from_interpreter_flags()
+        return [_python_exe] + opts + ['-c', prog, '--billiard-fork']
+
+
+def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):
+    '''
+    Run code specified by data received over pipe
+    '''
+    assert is_forking(sys.argv)
+    if sys.platform == 'win32':
+        import msvcrt
+        from .reduction import steal_handle
+        new_handle = steal_handle(parent_pid, pipe_handle)
+        fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
+    else:
+        from . import semaphore_tracker
+        semaphore_tracker._semaphore_tracker._fd = tracker_fd
+        fd = pipe_handle
+    exitcode = _main(fd)
+    sys.exit(exitcode)
+
+
+def _setup_logging_in_child_hack():
+    # Huge hack to make logging before Process.run work.
+    try:
+        os.environ["MP_MAIN_FILE"] = sys.modules["__main__"].__file__
+    except KeyError:
+        pass
+    except AttributeError:
+        pass
+    loglevel = os.environ.get("_MP_FORK_LOGLEVEL_")
+    logfile = os.environ.get("_MP_FORK_LOGFILE_") or None
+    format = os.environ.get("_MP_FORK_LOGFORMAT_")
+    if loglevel:
+        from . import util
+        import logging
+        logger = util.get_logger()
+        logger.setLevel(int(loglevel))
+        if not logger.handlers:
+            logger._rudimentary_setup = True
+            logfile = logfile or sys.__stderr__
+            if hasattr(logfile, "write"):
+                handler = logging.StreamHandler(logfile)
+            else:
+                handler = logging.FileHandler(logfile)
+            formatter = logging.Formatter(
+                format or util.DEFAULT_LOGGING_FORMAT,
+            )
+            handler.setFormatter(formatter)
+            logger.addHandler(handler)
+
+
+def _main(fd):
+    _Django_old_layout_hack__load()
+    with io.open(fd, 'rb', closefd=True) as from_parent:
+        process.current_process()._inheriting = True
+        try:
+            preparation_data = pickle.load(from_parent)
+            prepare(preparation_data)
+            _setup_logging_in_child_hack()
+            self = pickle.load(from_parent)
+        finally:
+            del process.current_process()._inheriting
+    return self._bootstrap()
+
+
+def _check_not_importing_main():
+    if getattr(process.current_process(), '_inheriting', False):
+        raise RuntimeError('''
+        An attempt has been made to start a new process before the
+        current process has finished its bootstrapping phase.
+
+        This probably means that you are not using fork to start your
+        child processes and you have forgotten to use the proper idiom
+        in the main module:
+
+            if __name__ == '__main__':
+                freeze_support()
+                ...
+
+        The "freeze_support()" line can be omitted if the program
+        is not going to be frozen to produce an executable.''')
+
+
+def get_preparation_data(name):
+    '''
+    Return info about parent needed by child to unpickle process object
+    '''
+    _check_not_importing_main()
+    d = dict(
+        log_to_stderr=util._log_to_stderr,
+        authkey=process.current_process().authkey,
+    )
+
+    if util._logger is not None:
+        d['log_level'] = util._logger.getEffectiveLevel()
+
+    sys_path = sys.path[:]
+    try:
+        i = sys_path.index('')
+    except ValueError:
+        pass
+    else:
+        sys_path[i] = process.ORIGINAL_DIR
+
+    d.update(
+        name=name,
+        sys_path=sys_path,
+        sys_argv=sys.argv,
+        orig_dir=process.ORIGINAL_DIR,
+        dir=os.getcwd(),
+        start_method=get_start_method(),
+    )
+
+    # Figure out whether to initialise main in the subprocess as a module
+    # or through direct execution (or to leave it alone entirely)
+    main_module = sys.modules['__main__']
+    try:
+        main_mod_name = main_module.__spec__.name
+    except AttributeError:
+        main_mod_name = main_module.__name__
+    if main_mod_name is not None:
+        d['init_main_from_name'] = main_mod_name
+    elif sys.platform != 'win32' or (not WINEXE and not WINSERVICE):
+        main_path = getattr(main_module, '__file__', None)
+        if main_path is not None:
+            if (not os.path.isabs(main_path) and
+                    process.ORIGINAL_DIR is not None):
+                main_path = os.path.join(process.ORIGINAL_DIR, main_path)
+            d['init_main_from_path'] = os.path.normpath(main_path)
+
+    return d
+
+#
+# Prepare current process
+#
+
+
+old_main_modules = []
+
+
+def prepare(data):
+    '''
+    Try to get current process ready to unpickle process object
+    '''
+    if 'name' in data:
+        process.current_process().name = data['name']
+
+    if 'authkey' in data:
+        process.current_process().authkey = data['authkey']
+
+    if 'log_to_stderr' in data and data['log_to_stderr']:
+        util.log_to_stderr()
+
+    if 'log_level' in data:
+        util.get_logger().setLevel(data['log_level'])
+
+    if 'sys_path' in data:
+        sys.path = data['sys_path']
+
+    if 'sys_argv' in data:
+        sys.argv = data['sys_argv']
+
+    if 'dir' in data:
+        os.chdir(data['dir'])
+
+    if 'orig_dir' in data:
+        process.ORIGINAL_DIR = data['orig_dir']
+
+    if 'start_method' in data:
+        set_start_method(data['start_method'])
+
+    if 'init_main_from_name' in data:
+        _fixup_main_from_name(data['init_main_from_name'])
+    elif 'init_main_from_path' in data:
+        _fixup_main_from_path(data['init_main_from_path'])
+
+# Multiprocessing module helpers to fix up the main module in
+# spawned subprocesses
+
+
+def _fixup_main_from_name(mod_name):
+    # __main__.py files for packages, directories, zip archives, etc, run
+    # their "main only" code unconditionally, so we don't even try to
+    # populate anything in __main__, nor do we make any changes to
+    # __main__ attributes
+    current_main = sys.modules['__main__']
+    if mod_name == "__main__" or mod_name.endswith(".__main__"):
+        return
+
+    # If this process was forked, __main__ may already be populated
+    try:
+        current_main_name = current_main.__spec__.name
+    except AttributeError:
+        current_main_name = current_main.__name__
+
+    if current_main_name == mod_name:
+        return
+
+    # Otherwise, __main__ may contain some non-main code where we need to
+    # support unpickling it properly. We rerun it as __mp_main__ and make
+    # the normal __main__ an alias to that
+    old_main_modules.append(current_main)
+    main_module = types.ModuleType("__mp_main__")
+    main_content = runpy.run_module(mod_name,
+                                    run_name="__mp_main__",
+                                    alter_sys=True)
+    main_module.__dict__.update(main_content)
+    sys.modules['__main__'] = sys.modules['__mp_main__'] = main_module
+
+
+def _fixup_main_from_path(main_path):
+    # If this process was forked, __main__ may already be populated
+    current_main = sys.modules['__main__']
+
+    # Unfortunately, the main ipython launch script historically had no
+    # "if __name__ == '__main__'" guard, so we work around that
+    # by treating it like a __main__.py file
+    # See https://github.com/ipython/ipython/issues/4698
+    main_name = os.path.splitext(os.path.basename(main_path))[0]
+    if main_name == 'ipython':
+        return
+
+    # Otherwise, if __file__ already has the setting we expect,
+    # there's nothing more to do
+    if getattr(current_main, '__file__', None) == main_path:
+        return
+
+    # If the parent process has sent a path through rather than a module
+    # name we assume it is an executable script that may contain
+    # non-main code that needs to be executed
+    old_main_modules.append(current_main)
+    main_module = types.ModuleType("__mp_main__")
+    main_content = runpy.run_path(main_path,
+                                  run_name="__mp_main__")
+    main_module.__dict__.update(main_content)
+    sys.modules['__main__'] = sys.modules['__mp_main__'] = main_module
+
+
+def import_main_path(main_path):
+    '''
+    Set sys.modules['__main__'] to module at main_path
+    '''
+    _fixup_main_from_path(main_path)

venv/lib/python3.12/site-packages/billiard/synchronize.py

@@ -0,0 +1,436 @@
+#
+# Module implementing synchronization primitives
+#
+# multiprocessing/synchronize.py
+#
+# Copyright (c) 2006-2008, R Oudkerk
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import errno
+import sys
+import tempfile
+import threading
+
+from . import context
+from . import process
+from . import util
+
+from ._ext import _billiard, ensure_SemLock
+from time import monotonic
+
+__all__ = [
+    'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event',
+]
+
+# Try to import the mp.synchronize module cleanly, if it fails
+# raise ImportError for platforms lacking a working sem_open implementation.
+# See issue 3770
+ensure_SemLock()
+
+#
+# Constants
+#
+
+RECURSIVE_MUTEX, SEMAPHORE = list(range(2))
+SEM_VALUE_MAX = _billiard.SemLock.SEM_VALUE_MAX
+
+try:
+    sem_unlink = _billiard.SemLock.sem_unlink
+except AttributeError:  # pragma: no cover
+    try:
+        # Py3.4+ implements sem_unlink and the semaphore must be named
+        from _multiprocessing import sem_unlink  # noqa
+    except ImportError:
+        sem_unlink = None   # noqa
+
+#
+# Base class for semaphores and mutexes; wraps `_billiard.SemLock`
+#
+
+
+def _semname(sl):
+    try:
+        return sl.name
+    except AttributeError:
+        pass
+
+
+class SemLock:
+    _rand = tempfile._RandomNameSequence()
+
+    def __init__(self, kind, value, maxvalue, ctx=None):
+        if ctx is None:
+            ctx = context._default_context.get_context()
+        name = ctx.get_start_method()
+        unlink_now = sys.platform == 'win32' or name == 'fork'
+        if sem_unlink:
+            for i in range(100):
+                try:
+                    sl = self._semlock = _billiard.SemLock(
+                        kind, value, maxvalue, self._make_name(), unlink_now,
+                    )
+                except (OSError, IOError) as exc:
+                    if getattr(exc, 'errno', None) != errno.EEXIST:
+                        raise
+                else:
+                    break
+            else:
+                exc = IOError('cannot find file for semaphore')
+                exc.errno = errno.EEXIST
+                raise exc
+        else:
+            sl = self._semlock = _billiard.SemLock(kind, value, maxvalue)
+
+        util.debug('created semlock with handle %s', sl.handle)
+        self._make_methods()
+
+        if sem_unlink:
+
+            if sys.platform != 'win32':
+                def _after_fork(obj):
+                    obj._semlock._after_fork()
+                util.register_after_fork(self, _after_fork)
+
+            if _semname(self._semlock) is not None:
+                # We only get here if we are on Unix with forking
+                # disabled.  When the object is garbage collected or the
+                # process shuts down we unlink the semaphore name
+                from .semaphore_tracker import register
+                register(self._semlock.name)
+                util.Finalize(self, SemLock._cleanup, (self._semlock.name,),
+                              exitpriority=0)
+
+    @staticmethod
+    def _cleanup(name):
+        from .semaphore_tracker import unregister
+        sem_unlink(name)
+        unregister(name)
+
+    def _make_methods(self):
+        self.acquire = self._semlock.acquire
+        self.release = self._semlock.release
+
+    def __enter__(self):
+        return self._semlock.__enter__()
+
+    def __exit__(self, *args):
+        return self._semlock.__exit__(*args)
+
+    def __getstate__(self):
+        context.assert_spawning(self)
+        sl = self._semlock
+        if sys.platform == 'win32':
+            h = context.get_spawning_popen().duplicate_for_child(sl.handle)
+        else:
+            h = sl.handle
+        state = (h, sl.kind, sl.maxvalue)
+        try:
+            state += (sl.name, )
+        except AttributeError:
+            pass
+        return state
+
+    def __setstate__(self, state):
+        self._semlock = _billiard.SemLock._rebuild(*state)
+        util.debug('recreated blocker with handle %r', state[0])
+        self._make_methods()
+
+    @staticmethod
+    def _make_name():
+        return '%s-%s' % (process.current_process()._config['semprefix'],
+                          next(SemLock._rand))
+
+
+class Semaphore(SemLock):
+
+    def __init__(self, value=1, ctx=None):
+        SemLock.__init__(self, SEMAPHORE, value, SEM_VALUE_MAX, ctx=ctx)
+
+    def get_value(self):
+        return self._semlock._get_value()
+
+    def __repr__(self):
+        try:
+            value = self._semlock._get_value()
+        except Exception:
+            value = 'unknown'
+        return '<%s(value=%s)>' % (self.__class__.__name__, value)
+
+
+class BoundedSemaphore(Semaphore):
+
+    def __init__(self, value=1, ctx=None):
+        SemLock.__init__(self, SEMAPHORE, value, value, ctx=ctx)
+
+    def __repr__(self):
+        try:
+            value = self._semlock._get_value()
+        except Exception:
+            value = 'unknown'
+        return '<%s(value=%s, maxvalue=%s)>' % (
+            self.__class__.__name__, value, self._semlock.maxvalue)
+
+
+class Lock(SemLock):
+    '''
+    Non-recursive lock.
+    '''
+
+    def __init__(self, ctx=None):
+        SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
+
+    def __repr__(self):
+        try:
+            if self._semlock._is_mine():
+                name = process.current_process().name
+                if threading.current_thread().name != 'MainThread':
+                    name += '|' + threading.current_thread().name
+            elif self._semlock._get_value() == 1:
+                name = 'None'
+            elif self._semlock._count() > 0:
+                name = 'SomeOtherThread'
+            else:
+                name = 'SomeOtherProcess'
+        except Exception:
+            name = 'unknown'
+        return '<%s(owner=%s)>' % (self.__class__.__name__, name)
+
+
+class RLock(SemLock):
+    '''
+    Recursive lock
+    '''
+
+    def __init__(self, ctx=None):
+        SemLock.__init__(self, RECURSIVE_MUTEX, 1, 1, ctx=ctx)
+
+    def __repr__(self):
+        try:
+            if self._semlock._is_mine():
+                name = process.current_process().name
+                if threading.current_thread().name != 'MainThread':
+                    name += '|' + threading.current_thread().name
+                count = self._semlock._count()
+            elif self._semlock._get_value() == 1:
+                name, count = 'None', 0
+            elif self._semlock._count() > 0:
+                name, count = 'SomeOtherThread', 'nonzero'
+            else:
+                name, count = 'SomeOtherProcess', 'nonzero'
+        except Exception:
+            name, count = 'unknown', 'unknown'
+        return '<%s(%s, %s)>' % (self.__class__.__name__, name, count)
+
+
+class Condition:
+    '''
+    Condition variable
+    '''
+
+    def __init__(self, lock=None, ctx=None):
+        assert ctx
+        self._lock = lock or ctx.RLock()
+        self._sleeping_count = ctx.Semaphore(0)
+        self._woken_count = ctx.Semaphore(0)
+        self._wait_semaphore = ctx.Semaphore(0)
+        self._make_methods()
+
+    def __getstate__(self):
+        context.assert_spawning(self)
+        return (self._lock, self._sleeping_count,
+                self._woken_count, self._wait_semaphore)
+
+    def __setstate__(self, state):
+        (self._lock, self._sleeping_count,
+         self._woken_count, self._wait_semaphore) = state
+        self._make_methods()
+
+    def __enter__(self):
+        return self._lock.__enter__()
+
+    def __exit__(self, *args):
+        return self._lock.__exit__(*args)
+
+    def _make_methods(self):
+        self.acquire = self._lock.acquire
+        self.release = self._lock.release
+
+    def __repr__(self):
+        try:
+            num_waiters = (self._sleeping_count._semlock._get_value() -
+                           self._woken_count._semlock._get_value())
+        except Exception:
+            num_waiters = 'unknown'
+        return '<%s(%s, %s)>' % (
+            self.__class__.__name__, self._lock, num_waiters)
+
+    def wait(self, timeout=None):
+        assert self._lock._semlock._is_mine(), \
+            'must acquire() condition before using wait()'
+
+        # indicate that this thread is going to sleep
+        self._sleeping_count.release()
+
+        # release lock
+        count = self._lock._semlock._count()
+        for i in range(count):
+            self._lock.release()
+
+        try:
+            # wait for notification or timeout
+            return self._wait_semaphore.acquire(True, timeout)
+        finally:
+            # indicate that this thread has woken
+            self._woken_count.release()
+
+            # reacquire lock
+            for i in range(count):
+                self._lock.acquire()
+
+    def notify(self):
+        assert self._lock._semlock._is_mine(), 'lock is not owned'
+        assert not self._wait_semaphore.acquire(False)
+
+        # to take account of timeouts since last notify() we subtract
+        # woken_count from sleeping_count and rezero woken_count
+        while self._woken_count.acquire(False):
+            res = self._sleeping_count.acquire(False)
+            assert res
+
+        if self._sleeping_count.acquire(False):  # try grabbing a sleeper
+            self._wait_semaphore.release()       # wake up one sleeper
+            self._woken_count.acquire()          # wait for sleeper to wake
+
+            # rezero _wait_semaphore in case a timeout just happened
+            self._wait_semaphore.acquire(False)
+
+    def notify_all(self):
+        assert self._lock._semlock._is_mine(), 'lock is not owned'
+        assert not self._wait_semaphore.acquire(False)
+
+        # to take account of timeouts since last notify*() we subtract
+        # woken_count from sleeping_count and rezero woken_count
+        while self._woken_count.acquire(False):
+            res = self._sleeping_count.acquire(False)
+            assert res
+
+        sleepers = 0
+        while self._sleeping_count.acquire(False):
+            self._wait_semaphore.release()        # wake up one sleeper
+            sleepers += 1
+
+        if sleepers:
+            for i in range(sleepers):
+                self._woken_count.acquire()       # wait for a sleeper to wake
+
+            # rezero wait_semaphore in case some timeouts just happened
+            while self._wait_semaphore.acquire(False):
+                pass
+
+    def wait_for(self, predicate, timeout=None):
+        result = predicate()
+        if result:
+            return result
+        if timeout is not None:
+            endtime = monotonic() + timeout
+        else:
+            endtime = None
+            waittime = None
+        while not result:
+            if endtime is not None:
+                waittime = endtime - monotonic()
+                if waittime <= 0:
+                    break
+            self.wait(waittime)
+            result = predicate()
+        return result
+
+
+class Event:
+
+    def __init__(self, ctx=None):
+        assert ctx
+        self._cond = ctx.Condition(ctx.Lock())
+        self._flag = ctx.Semaphore(0)
+
+    def is_set(self):
+        with self._cond:
+            if self._flag.acquire(False):
+                self._flag.release()
+                return True
+            return False
+
+    def set(self):
+        with self._cond:
+            self._flag.acquire(False)
+            self._flag.release()
+            self._cond.notify_all()
+
+    def clear(self):
+        with self._cond:
+            self._flag.acquire(False)
+
+    def wait(self, timeout=None):
+        with self._cond:
+            if self._flag.acquire(False):
+                self._flag.release()
+            else:
+                self._cond.wait(timeout)
+
+            if self._flag.acquire(False):
+                self._flag.release()
+                return True
+            return False
+
+#
+# Barrier
+#
+
+
+if hasattr(threading, 'Barrier'):
+
+    class Barrier(threading.Barrier):
+
+        def __init__(self, parties, action=None, timeout=None, ctx=None):
+            assert ctx
+            import struct
+            from .heap import BufferWrapper
+            wrapper = BufferWrapper(struct.calcsize('i') * 2)
+            cond = ctx.Condition()
+            self.__setstate__((parties, action, timeout, cond, wrapper))
+            self._state = 0
+            self._count = 0
+
+        def __setstate__(self, state):
+            (self._parties, self._action, self._timeout,
+             self._cond, self._wrapper) = state
+            self._array = self._wrapper.create_memoryview().cast('i')
+
+        def __getstate__(self):
+            return (self._parties, self._action, self._timeout,
+                    self._cond, self._wrapper)
+
+        @property
+        def _state(self):
+            return self._array[0]
+
+        @_state.setter
+        def _state(self, value):  # noqa
+            self._array[0] = value
+
+        @property
+        def _count(self):
+            return self._array[1]
+
+        @_count.setter
+        def _count(self, value):  # noqa
+            self._array[1] = value
+
+
+else:
+
+    class Barrier:  # noqa
+
+        def __init__(self, *args, **kwargs):
+            raise NotImplementedError('Barrier only supported on Py3')

venv/lib/python3.12/site-packages/billiard/util.py

@@ -0,0 +1,237 @@
+#
+# Module providing various facilities to other parts of the package
+#
+# billiard/util.py
+#
+# Copyright (c) 2006-2008, R Oudkerk --- see COPYING.txt
+# Licensed to PSF under a Contributor Agreement.
+#
+
+import sys
+import errno
+import functools
+import atexit
+
+try:
+    import cffi
+except ImportError:
+    import ctypes
+
+try:
+    from subprocess import _args_from_interpreter_flags  # noqa
+except ImportError:  # pragma: no cover
+    def _args_from_interpreter_flags():  # noqa
+        """Return a list of command-line arguments reproducing the current
+        settings in sys.flags and sys.warnoptions."""
+        flag_opt_map = {
+            'debug': 'd',
+            'optimize': 'O',
+            'dont_write_bytecode': 'B',
+            'no_user_site': 's',
+            'no_site': 'S',
+            'ignore_environment': 'E',
+            'verbose': 'v',
+            'bytes_warning': 'b',
+            'hash_randomization': 'R',
+            'py3k_warning': '3',
+        }
+        args = []
+        for flag, opt in flag_opt_map.items():
+            v = getattr(sys.flags, flag)
+            if v > 0:
+                args.append('-' + opt * v)
+        for opt in sys.warnoptions:
+            args.append('-W' + opt)
+        return args
+
+from multiprocessing.util import (  # noqa
+    _afterfork_registry,
+    _afterfork_counter,
+    _exit_function,
+    _finalizer_registry,
+    _finalizer_counter,
+    Finalize,
+    ForkAwareLocal,
+    ForkAwareThreadLock,
+    get_temp_dir,
+    is_exiting,
+    register_after_fork,
+    _run_after_forkers,
+    _run_finalizers,
+)
+
+from .compat import get_errno
+
+__all__ = [
+    'sub_debug', 'debug', 'info', 'sub_warning', 'get_logger',
+    'log_to_stderr', 'get_temp_dir', 'register_after_fork',
+    'is_exiting', 'Finalize', 'ForkAwareThreadLock', 'ForkAwareLocal',
+    'SUBDEBUG', 'SUBWARNING',
+]
+
+
+# Constants from prctl.h
+PR_GET_PDEATHSIG = 2
+PR_SET_PDEATHSIG = 1
+
+#
+# Logging
+#
+
+NOTSET = 0
+SUBDEBUG = 5
+DEBUG = 10
+INFO = 20
+SUBWARNING = 25
+WARNING = 30
+ERROR = 40
+
+LOGGER_NAME = 'multiprocessing'
+DEFAULT_LOGGING_FORMAT = '[%(levelname)s/%(processName)s] %(message)s'
+
+_logger = None
+_log_to_stderr = False
+
+
+def sub_debug(msg, *args, **kwargs):
+    if _logger:
+        _logger.log(SUBDEBUG, msg, *args, **kwargs)
+
+
+def debug(msg, *args, **kwargs):
+    if _logger:
+        _logger.log(DEBUG, msg, *args, **kwargs)
+
+
+def info(msg, *args, **kwargs):
+    if _logger:
+        _logger.log(INFO, msg, *args, **kwargs)
+
+
+def sub_warning(msg, *args, **kwargs):
+    if _logger:
+        _logger.log(SUBWARNING, msg, *args, **kwargs)
+
+def warning(msg, *args, **kwargs):
+    if _logger:
+        _logger.log(WARNING, msg, *args, **kwargs)
+
+def error(msg, *args, **kwargs):
+    if _logger:
+        _logger.log(ERROR, msg, *args, **kwargs)
+
+
+def get_logger():
+    '''
+    Returns logger used by multiprocessing
+    '''
+    global _logger
+    import logging
+
+    try:
+        # Python 3.13+
+        acquire, release = logging._prepareFork, logging._afterFork
+    except AttributeError:
+        acquire, release = logging._acquireLock, logging._releaseLock
+    acquire()
+    try:
+        if not _logger:
+
+            _logger = logging.getLogger(LOGGER_NAME)
+            _logger.propagate = 0
+            logging.addLevelName(SUBDEBUG, 'SUBDEBUG')
+            logging.addLevelName(SUBWARNING, 'SUBWARNING')
+
+            # XXX multiprocessing should cleanup before logging
+            if hasattr(atexit, 'unregister'):
+                atexit.unregister(_exit_function)
+                atexit.register(_exit_function)
+            else:
+                atexit._exithandlers.remove((_exit_function, (), {}))
+                atexit._exithandlers.append((_exit_function, (), {}))
+    finally:
+        release()
+
+    return _logger
+
+
+def log_to_stderr(level=None):
+    '''
+    Turn on logging and add a handler which prints to stderr
+    '''
+    global _log_to_stderr
+    import logging
+
+    logger = get_logger()
+    formatter = logging.Formatter(DEFAULT_LOGGING_FORMAT)
+    handler = logging.StreamHandler()
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+
+    if level:
+        logger.setLevel(level)
+    _log_to_stderr = True
+    return _logger
+
+
+def get_pdeathsig():
+    """
+    Return the current value of the parent process death signal
+    """
+    if not sys.platform.startswith('linux'):
+        # currently we support only linux platform.
+        raise OSError()
+    try:
+        if 'cffi' in sys.modules:
+            ffi = cffi.FFI()
+            ffi.cdef("int prctl (int __option, ...);")
+            arg = ffi.new("int *")
+            C = ffi.dlopen(None)
+            C.prctl(PR_GET_PDEATHSIG, arg)
+            return arg[0]
+        else:
+            sig = ctypes.c_int()
+            libc = ctypes.cdll.LoadLibrary("libc.so.6")
+            libc.prctl(PR_GET_PDEATHSIG, ctypes.byref(sig))
+            return sig.value
+    except Exception:
+        raise OSError()
+
+
+def set_pdeathsig(sig):
+    """
+    Set the parent process death signal of the calling process to sig
+    (either a signal value in the range 1..maxsig, or 0 to clear).
+    This is the signal that the calling process will get when its parent dies.
+    This value is cleared for the child of a fork(2) and
+    (since Linux 2.4.36 / 2.6.23) when executing a set-user-ID or set-group-ID binary.
+    """
+    if not sys.platform.startswith('linux'):
+        # currently we support only linux platform.
+        raise OSError("pdeathsig is only supported on linux")
+    try:
+        if 'cffi' in sys.modules:
+            ffi = cffi.FFI()
+            ffi.cdef("int prctl (int __option, ...);")
+            C = ffi.dlopen(None)
+            C.prctl(PR_SET_PDEATHSIG, ffi.cast("int", sig))
+        else:
+            libc = ctypes.cdll.LoadLibrary("libc.so.6")
+            libc.prctl(PR_SET_PDEATHSIG, ctypes.c_int(sig))
+    except Exception as e:
+        raise OSError("An error occured while setting pdeathsig") from e
+
+def _eintr_retry(func):
+    '''
+    Automatic retry after EINTR.
+    '''
+
+    @functools.wraps(func)
+    def wrapped(*args, **kwargs):
+        while 1:
+            try:
+                return func(*args, **kwargs)
+            except OSError as exc:
+                if get_errno(exc) != errno.EINTR:
+                    raise
+    return wrapped