Cython: _semaphore.py

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+001: # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False

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 002: from __future__ import print_function, absolute_import, division

 003:

+004: __all__ = [

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 005:     'Semaphore',

 006:     'BoundedSemaphore',

 007: ]

 008:

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 014:

 015:

+016: class Semaphore(AbstractLinkable): # pylint:disable=undefined-variable

struct __pyx_vtabstruct_6gevent_11__semaphore_Semaphore {
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 017:     """

 018:     Semaphore(value=1) -> Semaphore

 019:

 020:     A semaphore manages a counter representing the number of release()

 021:     calls minus the number of acquire() calls, plus an initial value.

 022:     The acquire() method blocks if necessary until it can return

 023:     without making the counter negative.

 024:

 025:     If not given, ``value`` defaults to 1.

 026:

 027:     The semaphore is a context manager and can be used in ``with`` statements.

 028:

 029:     This Semaphore's ``__exit__`` method does not call the trace function

 030:     on CPython, but does under PyPy.

 031:

 032:     .. seealso:: :class:`BoundedSemaphore` for a safer version that prevents

 033:        some classes of bugs.

 034:

 035:     .. versionchanged:: 1.4.0

 036:

 037:         The order in which waiters are awakened is not specified. It was not

 038:         specified previously, but usually went in FIFO order.

 039:     """

 040:

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 172:

 173:

 174:

 175: # By building the semaphore with Cython under PyPy, we get

 176: # atomic operations (specifically, exiting/releasing), at the

 177: # cost of some speed (one trivial semaphore micro-benchmark put the pure-python version

 178: # at around 1s and the compiled version at around 4s). Some clever subclassing

 179: # and having only the bare minimum be in cython might help reduce that penalty.

 180: # NOTE: You must use version 0.23.4 or later to avoid a memory leak.

 181: # https://mail.python.org/pipermail/cython-devel/2015-October/004571.html

 182: # However, that's all for naught on up to and including PyPy 4.0.1 which

 183: # have some serious crashing bugs with GC interacting with cython.

 184: # It hasn't been tested since then, and PURE_PYTHON is assumed to be true

 185: # for PyPy in all cases anyway, so this does nothing.

 186:

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