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

 003: """

 004: Internal module, support for the linkable protocol for "event" like objects.

 005: 

 006: """

 007: from __future__ import absolute_import

 008: from __future__ import division

 009: from __future__ import print_function

 010: 

+011: import sys

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 017: 

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 022:     'AbstractLinkable',

 023: ]

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 026:     # Encapsulates the standard parts of the linking and notifying

 027:     # protocol common to both repeatable events (Event, Semaphore) and

 028:     # one-time events (AsyncResult).

 029: 

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 033:         # Before this implementation, AsyncResult and Semaphore

 034:         # maintained the order of notifications, but Event did not.

 035: 

 036:         # In gevent 1.3, before Semaphore extended this class,

 037:         # that was changed to not maintain the order. It was done because

 038:         # Event guaranteed to only call callbacks once (a set) but

 039:         # AsyncResult had no such guarantees.

 040: 

 041:         # Semaphore likes to maintain order of callbacks, though,

 042:         # so when it was added we went back to a list implementation

 043:         # for storing callbacks. But we want to preserve the unique callback

 044:         # property, so we manually check.

 045: 

 046:         # We generally don't expect to have so many waiters (for any of those

 047:         # objects) that testing membership and removing is a bottleneck.

 048: 

 049:         # In PyPy 2.6.1 with Cython 0.23, `cdef public` or `cdef

 050:         # readonly` or simply `cdef` attributes of type `object` can appear to leak if

 051:         # a Python subclass is used (this is visible simply

 052:         # instantiating this subclass if _links=[]). Our _links and

 053:         # _notifier are such attributes, and gevent.thread subclasses

 054:         # this class. Thus, we carefully manage the lifetime of the

 055:         # objects we put in these attributes so that, in the normal

 056:         # case of a semaphore used correctly (deallocated when it's not

 057:         # locked and no one is waiting), the leak goes away (because

 058:         # these objects are back to None). This can also be solved on PyPy

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 060:         # CPython ("No attribute...")

 061:         # See https://github.com/gevent/gevent/issues/660

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 066:         # If its false, we only call callbacks as long as ready() returns true.

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