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PHP 8.1.31
Preview: synchronize.py Size: 11.34 KB
/lib/python3.8/multiprocessing/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 tempfile
import _multiprocessing
import time

from . import context
from . import process
from . import util

# 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, sem_unlink
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):

    _rand = tempfile._RandomNameSequence()

    def __init__(self, kind, value, maxvalue, *, ctx):
        if ctx is None:
            ctx = context._default_context.get_context()
        name = ctx.get_start_method()
        unlink_now = sys.platform == 'win32' or name == 'fork'
        for i in range(100):
            try:
                sl = self._semlock = _multiprocessing.SemLock(
                    kind, value, maxvalue, self._make_name(),
                    unlink_now)
            except FileExistsError:
                pass
            else:
                break
        else:
            raise FileExistsError('cannot find name for semaphore')

        util.debug('created semlock with handle %s' % sl.handle)
        self._make_methods()

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

        if self._semlock.name is not None:
            # We only get here if we are on Unix with forking
            # disabled.  When the object is garbage collected or the
            # process shuts down we unlink the semaphore name
            from .resource_tracker import register
            register(self._semlock.name, "semaphore")
            util.Finalize(self, SemLock._cleanup, (self._semlock.name,),
                          exitpriority=0)

    @staticmethod
    def _cleanup(name):
        from .resource_tracker import unregister
        sem_unlink(name)
        unregister(name, "semaphore")

    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):
        context.assert_spawning(self)
        sl = self._semlock
        if sys.platform == 'win32':
            h = context.get_spawning_popen().duplicate_for_child(sl.handle)
        else:
            h = sl.handle
        return (h, sl.kind, sl.maxvalue, sl.name)

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

    @staticmethod
    def _make_name():
        return '%s-%s' % (process.current_process()._config['semprefix'],
                          next(SemLock._rand))

#
# Semaphore
#

class Semaphore(SemLock):

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

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

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

#
# Bounded semaphore
#

class BoundedSemaphore(Semaphore):

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

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

#
# Non-recursive lock
#

class Lock(SemLock):

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

    def __repr__(self):
        try:
            if self._semlock._is_mine():
                name = process.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 '<%s(owner=%s)>' % (self.__class__.__name__, name)

#
# Recursive lock
#

class RLock(SemLock):

    def __init__(self, *, ctx):
        SemLock.__init__(self, RECURSIVE_MUTEX, 1, 1, ctx=ctx)

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

#
# Condition variable
#

class Condition(object):

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

    def __getstate__(self):
        context.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 '<%s(%s, %s)>' % (self.__class__.__name__, 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, n=1):
        assert self._lock._semlock._is_mine(), 'lock is not owned'
        assert not self._wait_semaphore.acquire(
            False), ('notify: Should not have been able to acquire '
                     + '_wait_semaphore')

        # 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, ('notify: Bug in sleeping_count.acquire'
                         + '- res should not be False')

        sleepers = 0
        while sleepers < n and 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 notify_all(self):
        self.notify(n=sys.maxsize)

    def wait_for(self, predicate, timeout=None):
        result = predicate()
        if result:
            return result
        if timeout is not None:
            endtime = time.monotonic() + timeout
        else:
            endtime = None
            waittime = None
        while not result:
            if endtime is not None:
                waittime = endtime - time.monotonic()
                if waittime <= 0:
                    break
            self.wait(waittime)
            result = predicate()
        return result

#
# Event
#

class Event(object):

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

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

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

    def clear(self):
        with self._cond:
            self._flag.acquire(False)

    def wait(self, timeout=None):
        with self._cond:
            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

#
# Barrier
#

class Barrier(threading.Barrier):

    def __init__(self, parties, action=None, timeout=None, *, ctx):
        import struct
        from .heap import BufferWrapper
        wrapper = BufferWrapper(struct.calcsize('i') * 2)
        cond = ctx.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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Kotlin Archives - Weelorum https://weelorum.com/technology/kotlin/ Full Cycle Mobile App Development Services For Startups Sun, 01 Mar 2026 20:04:38 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 PayFlow https://weelorum.com/portfolio-projects/payflow/ Sun, 01 Mar 2026 20:04:38 +0000 https://weelorum.com/success-stories/payflow/ PayFlow is a fintech application that simplifies international money transfers and currency exchange. Users can hold multiple currencies, send money globally with competitive rates, and receive instant notifications. The app features biometric authentication and real-time transaction tracking.

Сообщение PayFlow появились сначала на Weelorum.

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PayFlow is a fintech application that simplifies international money transfers and currency exchange. Users can hold multiple currencies, send money globally with competitive rates, and receive instant notifications. The app features biometric authentication and real-time transaction tracking.

Сообщение PayFlow появились сначала на Weelorum.

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Knock Knock https://weelorum.com/portfolio-projects/knock-knock/ Sun, 01 Mar 2026 20:04:37 +0000 https://weelorum.com/success-stories/knock-knock/ Knock Knock is a real-time restaurant discovery app. It shows users what’s happening inside venues, how crowded they are, and offers live previews via photos and video. The app uses geolocation to help people choose where to eat or socialize based on current ambiance.

Сообщение Knock Knock появились сначала на Weelorum.

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Knock Knock is a real-time restaurant discovery app. It shows users what’s happening inside venues, how crowded they are, and offers live previews via photos and video. The app uses geolocation to help people choose where to eat or socialize based on current ambiance.

Сообщение Knock Knock появились сначала на Weelorum.

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