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