+001: # Copyright (c) 2009-2012 Denis Bilenko. See LICENSE for details.

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 002: # copyright (c) 2018 gevent

 003: # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False

 004: """

 005: Synchronized queues.

 006: 

 007: The :mod:`gevent.queue` module implements multi-producer, multi-consumer queues

 008: that work across greenlets, with the API similar to the classes found in the

 009: standard :mod:`Queue` and :class:`multiprocessing <multiprocessing.Queue>` modules.

 010: 

 011: The classes in this module implement the iterator protocol. Iterating

 012: over a queue means repeatedly calling :meth:`get <Queue.get>` until

 013: :meth:`get <Queue.get>` returns ``StopIteration`` (specifically that

 014: class, not an instance or subclass).

 015: 

 016:     >>> import gevent.queue

 017:     >>> queue = gevent.queue.Queue()

 018:     >>> queue.put(1)

 019:     >>> queue.put(2)

 020:     >>> queue.put(StopIteration)

 021:     >>> for item in queue:

 022:     ...    print(item)

 023:     1

 024:     2

 025: 

 026: .. versionchanged:: 1.0

 027:        ``Queue(0)`` now means queue of infinite size, not a channel. A :exc:`DeprecationWarning`

 028:        will be issued with this argument.

 029: 

 030: .. versionchanged:: 25.4.1

 031:    :class:`Queue` was renamed to :class:`SimpleQueue`, while :class:`JoinableQueue` was

 032:    renamed to :class:`Queue` (`JoinableQueue` remains a backwards compatible alias).

 033:    This adds the ability to ``join()`` all queues, like the standard library.

 034: 

 035:    Previously ``SimpleQueue`` was an alias for the undocumented Python

 036:    implementation ``queue._PySimpleQueue``; now it is gevent's own implementation.

 037:    This ensures that it is cooperative even without monkey-patching.

 038: """

 039: 

 040: 

+041: import sys

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+042: from heapq import heappush as _heappush

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+045: import collections

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 049: # We re-export these exceptions to client modules.

 050: # But we also want fast access to them from Cython with a cdef,

 051: # and we do that with the _ definition.

+052: _Full = Full = __queue__.Full

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+053: _Empty = Empty = __queue__.Empty

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 054: 

+055: from gevent.timeout import Timeout

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+056: from gevent._hub_local import get_hub_noargs as get_hub

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+057: from gevent.exceptions import InvalidSwitchError

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 058: 

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+060: __implements__ = ['Queue', 'PriorityQueue', 'LifoQueue', 'SimpleQueue']

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 069:         """

 070:         gevent extension for Python versions less than 3.13

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 114:     """

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 116: 

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 119: 

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 122: 

 123:     .. versionchanged:: 1.1b3

 124:        Queues now support :func:`len`; it behaves the same as :meth:`qsize`.

 125:     .. versionchanged:: 1.1b3

 126:        Multiple greenlets that block on a call to :meth:`put` for a full queue

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 130:        implementation quirk under CPython *usually* ensured this was roughly the case

 131:        previously anyway, but that wasn't the case for PyPy.

 132:     .. versionchanged:: 24.10.1

 133:        Implement the ``shutdown`` methods from Python 3.13.

 134:     .. versionchanged:: 25.4.1

 135:        Renamed from ``Queue`` to ``SimpleQueue`` to better match the standard library.

 136:        While this class no longer has a ``shutdown`` method, the new ``Queue`` class

 137:        (previously ``JoinableQueue``) continues to have it.

 138:     .. versionchanged:: 25.4.2

 139:        Make this class subscriptable.

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