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?? __init__.py(6.66 KB)
?? __pycache__
?? connection.py(29.37 KB)
?? dummy
?? forking.py(14.4 KB)
?? heap.py(6.85 KB)
?? managers.py(35.23 KB)
?? pool.py(22.86 KB)
?? process.py(8.64 KB)
?? queues.py(11.28 KB)
?? reduction.py(9.27 KB)
?? sharedctypes.py(5.88 KB)
?? synchronize.py(10.48 KB)
?? util.py(9.68 KB)

Editing: util.py

#
# Module providing various facilities to other parts of the package
#
# multiprocessing/util.py
#
# Copyright (c) 2006-2008, R Oudkerk
# Licensed to PSF under a Contributor Agreement.
#

import sys
import functools
import os
import itertools
import weakref
import atexit
import threading        # we want threading to install it's
                        # cleanup function before multiprocessing does
from subprocess import _args_from_interpreter_flags

from multiprocessing.process import current_process, active_children

__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',
    ]

#
# Logging
#

NOTSET = 0
SUBDEBUG = 5
DEBUG = 10
INFO = 20
SUBWARNING = 25

LOGGER_NAME = 'multiprocessing'
DEFAULT_LOGGING_FORMAT = '[%(levelname)s/%(processName)s] %(message)s'

_logger = None
_log_to_stderr = False

def sub_debug(msg, *args):
    if _logger:
        _logger.log(SUBDEBUG, msg, *args)

def debug(msg, *args):
    if _logger:
        _logger.log(DEBUG, msg, *args)

def info(msg, *args):
    if _logger:
        _logger.log(INFO, msg, *args)

def sub_warning(msg, *args):
    if _logger:
        _logger.log(SUBWARNING, msg, *args)

def get_logger():
    '''
    Returns logger used by multiprocessing
    '''
    global _logger
    import logging

logging._acquireLock()
    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:
        logging._releaseLock()

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

#
# Function returning a temp directory which will be removed on exit
#

def get_temp_dir():
    # get name of a temp directory which will be automatically cleaned up
    if current_process()._tempdir is None:
        import shutil, tempfile
        tempdir = tempfile.mkdtemp(prefix='pymp-')
        info('created temp directory %s', tempdir)
        Finalize(None, shutil.rmtree, args=[tempdir], exitpriority=-100)
        current_process()._tempdir = tempdir
    return current_process()._tempdir

#
# Support for reinitialization of objects when bootstrapping a child process
#

_afterfork_registry = weakref.WeakValueDictionary()
_afterfork_counter = itertools.count()

def _run_after_forkers():
    items = list(_afterfork_registry.items())
    items.sort()
    for (index, ident, func), obj in items:
        try:
            func(obj)
        except Exception as e:
            info('after forker raised exception %s', e)

def register_after_fork(obj, func):
    _afterfork_registry[(next(_afterfork_counter), id(obj), func)] = obj

#
# Finalization using weakrefs
#

_finalizer_registry = {}
_finalizer_counter = itertools.count()

class Finalize(object):
    '''
    Class which supports object finalization using weakrefs
    '''
    def __init__(self, obj, callback, args=(), kwargs=None, exitpriority=None):
        assert exitpriority is None or type(exitpriority) is int

if obj is not None:
            self._weakref = weakref.ref(obj, self)
        else:
            assert exitpriority is not None

self._callback = callback
        self._args = args
        self._kwargs = kwargs or {}
        self._key = (exitpriority, next(_finalizer_counter))
        self._pid = os.getpid()

_finalizer_registry[self._key] = self

def __call__(self, wr=None,
                 # Need to bind these locally because the globals can have
                 # been cleared at shutdown
                 _finalizer_registry=_finalizer_registry,
                 sub_debug=sub_debug, getpid=os.getpid):
        '''
        Run the callback unless it has already been called or cancelled
        '''
        try:
            del _finalizer_registry[self._key]
        except KeyError:
            sub_debug('finalizer no longer registered')
        else:
            if self._pid != getpid():
                sub_debug('finalizer ignored because different process')
                res = None
            else:
                sub_debug('finalizer calling %s with args %s and kwargs %s',
                          self._callback, self._args, self._kwargs)
                res = self._callback(*self._args, **self._kwargs)
            self._weakref = self._callback = self._args = \
                            self._kwargs = self._key = None
            return res

def cancel(self):
        '''
        Cancel finalization of the object
        '''
        try:
            del _finalizer_registry[self._key]
        except KeyError:
            pass
        else:
            self._weakref = self._callback = self._args = \
                            self._kwargs = self._key = None

def still_active(self):
        '''
        Return whether this finalizer is still waiting to invoke callback
        '''
        return self._key in _finalizer_registry

def __repr__(self):
        try:
            obj = self._weakref()
        except (AttributeError, TypeError):
            obj = None

if obj is None:
            return '<Finalize object, dead>'

x = '<Finalize object, callback=%s' % \
            getattr(self._callback, '__name__', self._callback)
        if self._args:
            x += ', args=' + str(self._args)
        if self._kwargs:
            x += ', kwargs=' + str(self._kwargs)
        if self._key[0] is not None:
            x += ', exitprority=' + str(self._key[0])
        return x + '>'

def _run_finalizers(minpriority=None):
    '''
    Run all finalizers whose exit priority is not None and at least minpriority

Finalizers with highest priority are called first; finalizers with
    the same priority will be called in reverse order of creation.
    '''
    if _finalizer_registry is None:
        # This function may be called after this module's globals are
        # destroyed.  See the _exit_function function in this module for more
        # notes.
        return

if minpriority is None:
        f = lambda p : p[0][0] is not None
    else:
        f = lambda p : p[0][0] is not None and p[0][0] >= minpriority

items = [x for x in list(_finalizer_registry.items()) if f(x)]
    items.sort(reverse=True)

for key, finalizer in items:
        sub_debug('calling %s', finalizer)
        try:
            finalizer()
        except Exception:
            import traceback
            traceback.print_exc()

if minpriority is None:
        _finalizer_registry.clear()

#
# Clean up on exit
#

def is_exiting():
    '''
    Returns true if the process is shutting down
    '''
    return _exiting or _exiting is None

_exiting = False

def _exit_function(info=info, debug=debug, _run_finalizers=_run_finalizers,
                   active_children=active_children,
                   current_process=current_process):
    # We hold on to references to functions in the arglist due to the
    # situation described below, where this function is called after this
    # module's globals are destroyed.

global _exiting

if not _exiting:
        _exiting = True

info('process shutting down')
        debug('running all "atexit" finalizers with priority >= 0')
        _run_finalizers(0)

if current_process() is not None:
            # We check if the current process is None here because if
            # it's None, any call to ``active_children()`` will raise
            # an AttributeError (active_children winds up trying to
            # get attributes from util._current_process).  One
            # situation where this can happen is if someone has
            # manipulated sys.modules, causing this module to be
            # garbage collected.  The destructor for the module type
            # then replaces all values in the module dict with None.
            # For instance, after setuptools runs a test it replaces
            # sys.modules with a copy created earlier.  See issues
            # #9775 and #15881.  Also related: #4106, #9205, and
            # #9207.

for p in active_children():
                if p._daemonic:
                    info('calling terminate() for daemon %s', p.name)
                    p._popen.terminate()

for p in active_children():
                info('calling join() for process %s', p.name)
                p.join()

debug('running the remaining "atexit" finalizers')
        _run_finalizers()

atexit.register(_exit_function)

#
# Some fork aware types
#

class ForkAwareThreadLock(object):
    def __init__(self):
        self._reset()
        register_after_fork(self, ForkAwareThreadLock._reset)

def _reset(self):
        self._lock = threading.Lock()
        self.acquire = self._lock.acquire
        self.release = self._lock.release

class ForkAwareLocal(threading.local):
    def __init__(self):
        register_after_fork(self, lambda obj : obj.__dict__.clear())
    def __reduce__(self):
        return type(self), ()

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