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Edit File : __init__.py \| Size : 6.66 KB
# # 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. # __version__ = '0.70a1' __all__ = [ 'Process', 'current_process', 'active_children', 'freeze_support', 'Manager', 'Pipe', 'cpu_count', 'log_to_stderr', 'get_logger', 'allow_connection_pickling', 'BufferTooShort', 'TimeoutError', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event', 'Barrier', 'Queue', 'SimpleQueue', 'JoinableQueue', 'Pool', 'Value', 'Array', 'RawValue', 'RawArray', 'SUBDEBUG', 'SUBWARNING', ] __author__ = 'R. Oudkerk (r.m.oudkerk@gmail.com)' # # Imports # import os import sys from multiprocessing.process import Process, current_process, active_children from multiprocessing.util import SUBDEBUG, SUBWARNING # # Exceptions # class ProcessError(Exception): pass class BufferTooShort(ProcessError): pass class TimeoutError(ProcessError): pass class AuthenticationError(ProcessError): pass import _multiprocessing # # Definitions not depending on native semaphores # def Manager(): ''' 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 multiprocessing.managers import SyncManager m = SyncManager() m.start() return m def Pipe(duplex=True): ''' Returns two connection object connected by a pipe ''' from multiprocessing.connection import Pipe return Pipe(duplex) def cpu_count(): ''' Returns the number of CPUs in the system ''' 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 freeze_support(): ''' 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 multiprocessing.forking import freeze_support freeze_support() def get_logger(): ''' Return package logger -- if it does not already exist then it is created ''' from multiprocessing.util import get_logger return get_logger() def log_to_stderr(level=None): ''' Turn on logging and add a handler which prints to stderr ''' from multiprocessing.util import log_to_stderr return log_to_stderr(level) def allow_connection_pickling(): ''' 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. import multiprocessing.connection # # Definitions depending on native semaphores # def Lock(): ''' Returns a non-recursive lock object ''' from multiprocessing.synchronize import Lock return Lock() def RLock(): ''' Returns a recursive lock object ''' from multiprocessing.synchronize import RLock return RLock() def Condition(lock=None): ''' Returns a condition object ''' from multiprocessing.synchronize import Condition return Condition(lock) def Semaphore(value=1): ''' Returns a semaphore object ''' from multiprocessing.synchronize import Semaphore return Semaphore(value) def BoundedSemaphore(value=1): ''' Returns a bounded semaphore object ''' from multiprocessing.synchronize import BoundedSemaphore return BoundedSemaphore(value) def Event(): ''' Returns an event object ''' from multiprocessing.synchronize import Event return Event() def Barrier(parties, action=None, timeout=None): ''' Returns a barrier object ''' from multiprocessing.synchronize import Barrier return Barrier(parties, action, timeout) def Queue(maxsize=0): ''' Returns a queue object ''' from multiprocessing.queues import Queue return Queue(maxsize) def JoinableQueue(maxsize=0): ''' Returns a queue object ''' from multiprocessing.queues import JoinableQueue return JoinableQueue(maxsize) def SimpleQueue(): ''' Returns a queue object ''' from multiprocessing.queues import SimpleQueue return SimpleQueue() def Pool(processes=None, initializer=None, initargs=(), maxtasksperchild=None): ''' Returns a process pool object ''' from multiprocessing.pool import Pool return Pool(processes, initializer, initargs, maxtasksperchild) def RawValue(typecode_or_type, args): ''' Returns a shared object ''' from multiprocessing.sharedctypes import RawValue return RawValue(typecode_or_type, args) def RawArray(typecode_or_type, size_or_initializer): ''' Returns a shared array ''' from multiprocessing.sharedctypes import RawArray return RawArray(typecode_or_type, size_or_initializer) def Value(typecode_or_type, args, lock=True): ''' Returns a synchronized shared object ''' from multiprocessing.sharedctypes import Value return Value(typecode_or_type, args, lock=lock) def Array(typecode_or_type, size_or_initializer, *, lock=True): ''' Returns a synchronized shared array ''' from multiprocessing.sharedctypes import Array return Array(typecode_or_type, size_or_initializer, lock=lock) # # # if sys.platform == 'win32': def set_executable(executable): ''' Sets the path to a python.exe or pythonw.exe binary used to run child processes on Windows instead of sys.executable. Useful for people embedding Python. ''' from multiprocessing.forking import set_executable set_executable(executable) __all__ += ['set_executable'] Back

Edit File : __init__.py | Size : 6.66 KB

#
# 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.
#

__version__ = '0.70a1'

__all__ = [
    'Process', 'current_process', 'active_children', 'freeze_support',
    'Manager', 'Pipe', 'cpu_count', 'log_to_stderr', 'get_logger',
    'allow_connection_pickling', 'BufferTooShort', 'TimeoutError',
    'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition',
    'Event', 'Barrier', 'Queue', 'SimpleQueue', 'JoinableQueue', 'Pool',
    'Value', 'Array', 'RawValue', 'RawArray', 'SUBDEBUG', 'SUBWARNING',
    ]

__author__ = 'R. Oudkerk (r.m.oudkerk@gmail.com)'

#
# Imports
#

import os
import sys

from multiprocessing.process import Process, current_process, active_children
from multiprocessing.util import SUBDEBUG, SUBWARNING

#
# Exceptions
#

class ProcessError(Exception):
    pass

class BufferTooShort(ProcessError):
    pass

class TimeoutError(ProcessError):
    pass

class AuthenticationError(ProcessError):
    pass

import _multiprocessing

#
# Definitions not depending on native semaphores
#

def Manager():
    '''
    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 multiprocessing.managers import SyncManager
    m = SyncManager()
    m.start()
    return m

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

def cpu_count():
    '''
    Returns the number of CPUs in the system
    '''
    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 freeze_support():
    '''
    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 multiprocessing.forking import freeze_support
        freeze_support()

def get_logger():
    '''
    Return package logger -- if it does not already exist then it is created
    '''
    from multiprocessing.util import get_logger
    return get_logger()

def log_to_stderr(level=None):
    '''
    Turn on logging and add a handler which prints to stderr
    '''
    from multiprocessing.util import log_to_stderr
    return log_to_stderr(level)

def allow_connection_pickling():
    '''
    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.
    import multiprocessing.connection

#
# Definitions depending on native semaphores
#

def Lock():
    '''
    Returns a non-recursive lock object
    '''
    from multiprocessing.synchronize import Lock
    return Lock()

def RLock():
    '''
    Returns a recursive lock object
    '''
    from multiprocessing.synchronize import RLock
    return RLock()

def Condition(lock=None):
    '''
    Returns a condition object
    '''
    from multiprocessing.synchronize import Condition
    return Condition(lock)

def Semaphore(value=1):
    '''
    Returns a semaphore object
    '''
    from multiprocessing.synchronize import Semaphore
    return Semaphore(value)

def BoundedSemaphore(value=1):
    '''
    Returns a bounded semaphore object
    '''
    from multiprocessing.synchronize import BoundedSemaphore
    return BoundedSemaphore(value)

def Event():
    '''
    Returns an event object
    '''
    from multiprocessing.synchronize import Event
    return Event()

def Barrier(parties, action=None, timeout=None):
    '''
    Returns a barrier object
    '''
    from multiprocessing.synchronize import Barrier
    return Barrier(parties, action, timeout)

def Queue(maxsize=0):
    '''
    Returns a queue object
    '''
    from multiprocessing.queues import Queue
    return Queue(maxsize)

def JoinableQueue(maxsize=0):
    '''
    Returns a queue object
    '''
    from multiprocessing.queues import JoinableQueue
    return JoinableQueue(maxsize)

def SimpleQueue():
    '''
    Returns a queue object
    '''
    from multiprocessing.queues import SimpleQueue
    return SimpleQueue()

def Pool(processes=None, initializer=None, initargs=(), maxtasksperchild=None):
    '''
    Returns a process pool object
    '''
    from multiprocessing.pool import Pool
    return Pool(processes, initializer, initargs, maxtasksperchild)

def RawValue(typecode_or_type, *args):
    '''
    Returns a shared object
    '''
    from multiprocessing.sharedctypes import RawValue
    return RawValue(typecode_or_type, *args)

def RawArray(typecode_or_type, size_or_initializer):
    '''
    Returns a shared array
    '''
    from multiprocessing.sharedctypes import RawArray
    return RawArray(typecode_or_type, size_or_initializer)

def Value(typecode_or_type, *args, lock=True):
    '''
    Returns a synchronized shared object
    '''
    from multiprocessing.sharedctypes import Value
    return Value(typecode_or_type, *args, lock=lock)

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

#
#
#

if sys.platform == 'win32':

def set_executable(executable):
        '''
        Sets the path to a python.exe or pythonw.exe binary used to run
        child processes on Windows instead of sys.executable.
        Useful for people embedding Python.
        '''
        from multiprocessing.forking import set_executable
        set_executable(executable)

__all__ += ['set_executable']

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