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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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    +015: from gevent.exceptions import ConcurrentObjectUseError

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     018:     'Waiter',

     019: ]

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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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