Generated by Cython 0.29.2
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Click on a line that starts with a "+" to see the C code that Cython generated for it.
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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+015: from gevent.exceptions import ConcurrentObjectUseError
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016:
+017: __all__ = [
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018: 'Waiter',
019: ]
020:
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022:
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025:
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: >>> result = Waiter()
042: >>> timer = get_hub().loop.timer(0.1)
043: >>> timer.start(result.switch, 'hello from Waiter')
044: >>> result.get() # blocks for 0.1 seconds
045: 'hello from Waiter'
046: >>> timer.close()
047:
048: If switch is called before the greenlet gets a chance to call :meth:`get` then
049: :class:`Waiter` stores the value.
050:
051: >>> result = Waiter()
052: >>> timer = get_hub().loop.timer(0.1)
053: >>> timer.start(result.switch, 'hi from Waiter')
054: >>> sleep(0.2)
055: >>> result.get() # returns immediately without blocking
056: 'hi from Waiter'
057: >>> timer.close()
058:
059: .. warning::
060:
061: This a limited and dangerous way to communicate between
062: greenlets. It can easily leave a greenlet unscheduled forever
063: if used incorrectly. Consider using safer classes such as
064: :class:`gevent.event.Event`, :class:`gevent.event.AsyncResult`,
065: or :class:`gevent.queue.Queue`.
066: """
067:
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