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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: synchronize.py

#
# Module implementing synchronization primitives
#
# multiprocessing/synchronize.py
#
# Copyright (c) 2006-2008, R Oudkerk
# Licensed to PSF under a Contributor Agreement.
#

__all__ = [
    'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event'
    ]

import threading
import sys

import _multiprocessing
from multiprocessing.process import current_process
from multiprocessing.util import register_after_fork, debug
from multiprocessing.forking import assert_spawning, Popen
from time import time as _time

# Try to import the mp.synchronize module cleanly, if it fails
# raise ImportError for platforms lacking a working sem_open implementation.
# See issue 3770
try:
    from _multiprocessing import SemLock
except (ImportError):
    raise ImportError("This platform lacks a functioning sem_open" +
                      " implementation, therefore, the required" +
                      " synchronization primitives needed will not" +
                      " function, see issue 3770.")

#
# Constants
#

RECURSIVE_MUTEX, SEMAPHORE = list(range(2))
SEM_VALUE_MAX = _multiprocessing.SemLock.SEM_VALUE_MAX

#
# Base class for semaphores and mutexes; wraps `_multiprocessing.SemLock`
#

class SemLock(object):

def __init__(self, kind, value, maxvalue):
        sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
        debug('created semlock with handle %s' % sl.handle)
        self._make_methods()

if sys.platform != 'win32':
            def _after_fork(obj):
                obj._semlock._after_fork()
            register_after_fork(self, _after_fork)

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):
        assert_spawning(self)
        sl = self._semlock
        return (Popen.duplicate_for_child(sl.handle), sl.kind, sl.maxvalue)

def __setstate__(self, state):
        self._semlock = _multiprocessing.SemLock._rebuild(*state)
        debug('recreated blocker with handle %r' % state[0])
        self._make_methods()

#
# Semaphore
#

class Semaphore(SemLock):

def __init__(self, value=1):
        SemLock.__init__(self, SEMAPHORE, value, SEM_VALUE_MAX)

def get_value(self):
        return self._semlock._get_value()

def __repr__(self):
        try:
            value = self._semlock._get_value()
        except Exception:
            value = 'unknown'
        return '<Semaphore(value=%s)>' % value

#
# Bounded semaphore
#

class BoundedSemaphore(Semaphore):

def __init__(self, value=1):
        SemLock.__init__(self, SEMAPHORE, value, value)

def __repr__(self):
        try:
            value = self._semlock._get_value()
        except Exception:
            value = 'unknown'
        return '<BoundedSemaphore(value=%s, maxvalue=%s)>' % \
               (value, self._semlock.maxvalue)

#
# Non-recursive lock
#

class Lock(SemLock):

def __init__(self):
        SemLock.__init__(self, SEMAPHORE, 1, 1)

def __repr__(self):
        try:
            if self._semlock._is_mine():
                name = 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 '<Lock(owner=%s)>' % name

#
# Recursive lock
#

class RLock(SemLock):

def __init__(self):
        SemLock.__init__(self, RECURSIVE_MUTEX, 1, 1)

def __repr__(self):
        try:
            if self._semlock._is_mine():
                name = 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 '<RLock(%s, %s)>' % (name, count)

#
# Condition variable
#

class Condition(object):

def __init__(self, lock=None):
        self._lock = lock or RLock()
        self._sleeping_count = Semaphore(0)
        self._woken_count = Semaphore(0)
        self._wait_semaphore = Semaphore(0)
        self._make_methods()

def __getstate__(self):
        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 '<Condition(%s, %s)>' % (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 the 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 = _time() + timeout
        else:
            endtime = None
            waittime = None
        while not result:
            if endtime is not None:
                waittime = endtime - _time()
                if waittime <= 0:
                    break
            self.wait(waittime)
            result = predicate()
        return result

#
# Event
#

class Event(object):

def __init__(self):
        self._cond = Condition(Lock())
        self._flag = Semaphore(0)

def is_set(self):
        self._cond.acquire()
        try:
            if self._flag.acquire(False):
                self._flag.release()
                return True
            return False
        finally:
            self._cond.release()

def set(self):
        self._cond.acquire()
        try:
            self._flag.acquire(False)
            self._flag.release()
            self._cond.notify_all()
        finally:
            self._cond.release()

def clear(self):
        self._cond.acquire()
        try:
            self._flag.acquire(False)
        finally:
            self._cond.release()

def wait(self, timeout=None):
        self._cond.acquire()
        try:
            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
        finally:
            self._cond.release()

#
# Barrier
#

class Barrier(threading.Barrier):

def __init__(self, parties, action=None, timeout=None):
        import struct
        from multiprocessing.heap import BufferWrapper
        wrapper = BufferWrapper(struct.calcsize('i') * 2)
        cond = 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):
        self._array[0] = value

@property
    def _count(self):
        return self._array[1]

@_count.setter
    def _count(self, value):
        self._array[1] = value

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