forked from openkylin/python-greenlet
45 lines
1.2 KiB
ReStructuredText
45 lines
1.2 KiB
ReStructuredText
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Greenlets and Python Threads
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==============================
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Greenlets can be combined with Python threads; in this case, each thread
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contains an independent "main" greenlet with a tree of sub-greenlets. It
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is not possible to mix or switch between greenlets belonging to different
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threads.
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.. doctest::
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>>> from greenlet import getcurrent
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>>> from threading import Thread
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>>> from threading import Event
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>>> started = Event()
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>>> switched = Event()
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>>> class T(Thread):
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... def run(self):
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... self.glet = getcurrent()
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... started.set()
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... switched.wait()
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>>> t = T()
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>>> t.start()
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>>> _ = started.wait()
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>>> t.glet.switch()
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Traceback (most recent call last):
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...
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greenlet.error: cannot switch to a different thread
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>>> switched.set()
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>>> t.join()
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Note that when a thread dies, the thread's main greenlet is not
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considered to be dead.
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.. doctest::
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>>> t.glet.dead
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False
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.. caution::
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For these reasons, it's best to not pass references to a greenlet
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running in one thread to another thread. If you do, take caution to
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carefully manage the lifetime of the references.
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