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Raw output: _waiter.c

+001: # -*- coding: utf-8 -*-
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 002: # copyright 2018 gevent
 003: # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False
 004: """
 005: Low-level waiting primitives.
 006: 
 007: """
 008: from __future__ import absolute_import
 009: from __future__ import division
 010: from __future__ import print_function
 011: 
+012: import sys
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 013: 
+014: from gevent._hub_local import get_hub_noargs as get_hub
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+017: __all__ = [
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 018:     'Waiter',
 019: ]
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 026: 
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 028:     """
 029:     A low level communication utility for greenlets.
 030: 
 031:     Waiter is a wrapper around greenlet's ``switch()`` and ``throw()`` calls that makes them somewhat safer:
 032: 
 033:     * switching will occur only if the waiting greenlet is executing :meth:`get` method currently;
 034:     * any error raised in the greenlet is handled inside :meth:`switch` and :meth:`throw`
 035:     * if :meth:`switch`/:meth:`throw` is called before the receiver calls :meth:`get`, then :class:`Waiter`
 036:       will store the value/exception. The following :meth:`get` will return the value/raise the exception.
 037: 
 038:     The :meth:`switch` and :meth:`throw` methods must only be called from the :class:`Hub` greenlet.
 039:     The :meth:`get` method must be called from a greenlet other than :class:`Hub`.
 040: 
 041:         >>> from gevent.hub import Waiter
 042:         >>> from gevent import get_hub
 043:         >>> result = Waiter()
 044:         >>> timer = get_hub().loop.timer(0.1)
 045:         >>> timer.start(result.switch, 'hello from Waiter')
 046:         >>> result.get() # blocks for 0.1 seconds
 047:         'hello from Waiter'
 048:         >>> timer.close()
 049: 
 050:     If switch is called before the greenlet gets a chance to call :meth:`get` then
 051:     :class:`Waiter` stores the value.
 052: 
 053:         >>> from gevent.time import sleep
 054:         >>> result = Waiter()
 055:         >>> timer = get_hub().loop.timer(0.1)
 056:         >>> timer.start(result.switch, 'hi from Waiter')
 057:         >>> sleep(0.2)
 058:         >>> result.get() # returns immediately without blocking
 059:         'hi from Waiter'
 060:         >>> timer.close()
 061: 
 062:     .. warning::
 063: 
 064:         This is a limited and dangerous way to communicate between
 065:         greenlets. It can easily leave a greenlet unscheduled forever
 066:         if used incorrectly. Consider using safer classes such as
 067:         :class:`gevent.event.Event`, :class:`gevent.event.AsyncResult`,
 068:         or :class:`gevent.queue.Queue`.
 069:     """
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