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Raw output: _abstract_linkable.c

    +001: # -*- coding: utf-8 -*-

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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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     012:

    +013: from gevent._hub_local import get_hub_noargs as get_hub

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     014:

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    +016: from gevent.timeout import Timeout

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     017:

    +018: locals()['getcurrent'] = __import__('greenlet').getcurrent

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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:     #

     030:     # TODO: As of gevent 1.5, we use the same datastructures and almost

     031:     # the same algorithm as Greenlet. See about unifying them more.

     032:

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     035:         '_links',

     036:         '_notifier',

     037:         '_notify_all',

     038:         '__weakref__'

     039:     )

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     042:         # Before this implementation, AsyncResult and Semaphore

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

     044:

     045:         # In gevent 1.3, before Semaphore extended this class, that

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

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

     048:         # AsyncResult had no such guarantees. When Semaphore was

     049:         # changed to extend this class, it lost its ordering

     050:         # guarantees. Unfortunately, that made it unfair. There are

     051:         # rare cases that this can starve a greenlet

     052:         # (https://github.com/gevent/gevent/issues/1487) and maybe

     053:         # even lead to deadlock (not tested).

     054:

     055:         # So in gevent 1.5 we go back to maintaining order. But it's

     056:         # still important not to make duplicate calls, and it's also

     057:         # important to avoid O(n^2) behaviour that can result from

     058:         # naive use of a simple list due to the need to handle removed

     059:         # links in the _notify_links loop. Cython has special support for

     060:         # built-in sets, lists, and dicts, but not ordereddict. Rather than

     061:         # use two data structures, or a dict({link: order}), we simply use a

     062:         # list and remove objects as we go, keeping track of them so as not to

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