FM / multiprocessing

/usr/lib64/python3.6/multiprocessing

Name	Size	Mode	Actions
dummy/	-	0755	rm
__pycache__/	-	0755	rm
connection.py	31062	0644	edit dl rm
context.py	10917	0644	edit dl rm
forkserver.py	8694	0644	edit dl rm
heap.py	8319	0644	edit dl rm
managers.py	38151	0644	edit dl rm
pool.py	26059	0644	edit dl rm
popen_fork.py	2307	0644	edit dl rm
popen_forkserver.py	1956	0644	edit dl rm
popen_spawn_posix.py	1904	0644	edit dl rm
popen_spawn_win32.py	2999	0644	edit dl rm
process.py	9211	0644	edit dl rm
queues.py	10763	0644	edit dl rm
reduction.py	9226	0644	edit dl rm
resource_sharer.py	5325	0644	edit dl rm
semaphore_tracker.py	5394	0644	edit dl rm
sharedctypes.py	6245	0644	edit dl rm
spawn.py	8863	0644	edit dl rm
synchronize.py	12050	0644	edit dl rm
util.py	11886	0644	edit dl rm
__init__.py	923	0644	edit dl rm

Edit: /usr/lib64/python3.6/multiprocessing/context.py (10917B)

import os
import sys
import threading

from . import process
from . import reduction

__all__ = []            # things are copied from here to __init__.py

#
# Exceptions
#

class ProcessError(Exception):
    pass

class BufferTooShort(ProcessError):
    pass

class TimeoutError(ProcessError):
    pass

class AuthenticationError(ProcessError):
    pass

#
# Base type for contexts
#

class BaseContext(object):

ProcessError = ProcessError
    BufferTooShort = BufferTooShort
    TimeoutError = TimeoutError
    AuthenticationError = AuthenticationError

current_process = staticmethod(process.current_process)
    active_children = staticmethod(process.active_children)

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

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):
        '''Returns two connection object connected by a pipe'''
        from .connection import Pipe
        return Pipe(duplex)

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):
        '''Returns a process pool object'''
        from .pool import Pool
        return Pool(processes, initializer, initargs, maxtasksperchild,
                    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, lock=True):
        '''Returns a synchronized shared object'''
        from .sharedctypes import Value
        return Value(typecode_or_type, *args, lock=lock,
                     ctx=self.get_context())

def Array(self, typecode_or_type, size_or_initializer, *, lock=True):
        '''Returns a synchronized shared array'''
        from .sharedctypes import Array
        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

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, force=False):
        raise ValueError('cannot set start method of concrete context')

@property
    def reducer(self):
        '''Controls how objects will be reduced to a form that can be
        shared with other processes.'''
        return globals().get('reduction')

@reducer.setter
    def reducer(self, reduction):
        globals()['reduction'] = reduction

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().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:
            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):
            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__
            )

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