GNXSOFT.COM

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

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+#
+# 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()