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91 lines
3.2 KiB
91 lines
3.2 KiB
# -*- coding: utf-8 -*-
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# copyright (c) 2018 gevent. See LICENSE.
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# cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False
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"""
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A collection of primitives used by the hub, and suitable for
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compilation with Cython because of their frequency of use.
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"""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from weakref import ref as wref
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from gc import get_objects
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from greenlet import greenlet
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from gevent.exceptions import BlockingSwitchOutError
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# In Cython, we define these as 'cdef inline' functions. The
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# compilation unit cannot have a direct assignment to them (import
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# is assignment) without generating a 'lvalue is not valid target'
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# error.
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locals()['getcurrent'] = __import__('greenlet').getcurrent
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locals()['greenlet_init'] = lambda: None
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locals()['_greenlet_switch'] = greenlet.switch
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__all__ = [
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'TrackedRawGreenlet',
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'SwitchOutGreenletWithLoop',
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]
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class TrackedRawGreenlet(greenlet):
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def __init__(self, function, parent):
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greenlet.__init__(self, function, parent)
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# See greenlet.py's Greenlet class. We capture the cheap
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# parts to maintain the tree structure, but we do not capture
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# the stack because that's too expensive for 'spawn_raw'.
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current = getcurrent() # pylint:disable=undefined-variable
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self.spawning_greenlet = wref(current)
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# See Greenlet for how trees are maintained.
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try:
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self.spawn_tree_locals = current.spawn_tree_locals
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except AttributeError:
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self.spawn_tree_locals = {}
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if current.parent:
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current.spawn_tree_locals = self.spawn_tree_locals
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class SwitchOutGreenletWithLoop(TrackedRawGreenlet):
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# Subclasses must define:
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# - self.loop
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# This class defines loop in its .pxd for Cython. This lets us avoid
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# circular dependencies with the hub.
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def switch(self):
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switch_out = getattr(getcurrent(), 'switch_out', None) # pylint:disable=undefined-variable
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if switch_out is not None:
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switch_out()
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return _greenlet_switch(self) # pylint:disable=undefined-variable
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def switch_out(self):
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raise BlockingSwitchOutError('Impossible to call blocking function in the event loop callback')
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def get_reachable_greenlets():
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# We compile this loop with Cython so that it's faster, and so that
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# the GIL isn't dropped at unpredictable times during the loop.
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# Dropping the GIL could lead to accessing partly constructed objects
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# in undefined states (particularly, tuples). This helps close a hole
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# where a `SystemError: Objects/tupleobject.c bad argument to internal function`
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# could get raised. (Note that this probably doesn't completely close the hole,
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# if other threads have dropped the GIL, but hopefully the speed makes that
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# more rare.) See https://github.com/gevent/gevent/issues/1302
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return [
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x for x in get_objects()
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if isinstance(x, greenlet) and not getattr(x, 'greenlet_tree_is_ignored', False)
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]
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def _init():
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greenlet_init() # pylint:disable=undefined-variable
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_init()
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from gevent._util import import_c_accel
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import_c_accel(globals(), 'gevent.__greenlet_primitives')
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