Generated by Cython 3.0.0a9
Yellow lines hint at Python interaction.
Click on a line that starts with a "+" to see the C code that Cython generated for it.
Raw output: _abstract_linkable.c
+001: # -*- coding: utf-8 -*-
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002: # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False
003: """
004: Internal module, support for the linkable protocol for "event" like objects.
005:
006: """
007: from __future__ import absolute_import
008: from __future__ import division
009: from __future__ import print_function
010:
+011: import sys
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+012: from gc import get_objects
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013:
+014: from greenlet import greenlet
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+015: from greenlet import error as greenlet_error
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016:
+017: from gevent._compat import thread_mod_name
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+018: from gevent._hub_local import get_hub_noargs as get_hub
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+019: from gevent._hub_local import get_hub_if_exists
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020:
+021: from gevent.exceptions import InvalidSwitchError
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+022: from gevent.exceptions import InvalidThreadUseError
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+023: from gevent.timeout import Timeout
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024:
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029: 'AbstractLinkable',
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031:
032: # Need the real get_ident. We're imported early enough during monkey-patching
033: # that we can be sure nothing is monkey patched yet.
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050: # Make sure to only find hubs that have a loop
051: # and aren't destroyed. If we don't do that, we can
052: # get an old hub that no longer works leading to issues in
053: # combined test cases.
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056:
057:
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059: # Encapsulates the standard parts of the linking and notifying
060: # protocol common to both repeatable events (Event, Semaphore) and
061: # one-time events (AsyncResult).
062: #
063: # With a few careful exceptions, instances of this object can only
064: # be used from a single thread. The exception is that certain methods
065: # may be used from multiple threads IFF:
066: #
067: # 1. They are documented as safe for that purpose; AND
068: # 2a. This object is compiled with Cython and thus is holding the GIL
069: # for the entire duration of the method; OR
070: # 2b. A subclass ensures that a Python-level native thread lock is held
071: # for the duration of the method; this is necessary in pure-Python mode.
072: # The only known implementation of such
073: # a subclass is for Semaphore. AND
074: # 3. The subclass that calls ``capture_hub`` catches
075: # and handles ``InvalidThreadUseError``
076: #
077: # TODO: As of gevent 1.5, we use the same datastructures and almost
078: # the same algorithm as Greenlet. See about unifying them more.
079:
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084: '_notify_all',
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089: # Before this implementation, AsyncResult and Semaphore
090: # maintained the order of notifications, but Event did not.
091:
092: # In gevent 1.3, before Semaphore extended this class, that
093: # was changed to not maintain the order. It was done because
094: # Event guaranteed to only call callbacks once (a set) but
095: # AsyncResult had no such guarantees. When Semaphore was
096: # changed to extend this class, it lost its ordering
097: # guarantees. Unfortunately, that made it unfair. There are
098: # rare cases that this can starve a greenlet
099: # (https://github.com/gevent/gevent/issues/1487) and maybe
100: # even lead to deadlock (not tested).
101:
102: # So in gevent 1.5 we go back to maintaining order. But it's
103: # still important not to make duplicate calls, and it's also
104: # important to avoid O(n^2) behaviour that can result from
105: # naive use of a simple list due to the need to handle removed
106: # links in the _notify_links loop. Cython has special support for
107: # built-in sets, lists, and dicts, but not ordereddict. Rather than
108: # use two data structures, or a dict({link: order}), we simply use a
109: # list and remove objects as we go, keeping track of them so as not to
110: # have duplicates called. This makes `unlink` O(n), but we can avoid
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290: # thread simply cannot arrive and mutate ``_links`` or ``arrived_while_waiting``
291:
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335: # TODO: Maybe we should intelligently reset self.hub to
336: # free up thread affinity? In case of a pathological situation where
337: # one object was used from one thread once & first, but usually is
338: # used by another thread.
339: #
340: # BoundedSemaphore does this.
341: # Now we may be ready or not ready. If we're ready, which
342: # could have happened during the last link we called, then we
343: # must have more links than we started with. We need to schedule the
344: # wakeup.
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349:
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351: # Given a list of callable objects that raised
352: # ``greenlet.error`` when we called them: If we can determine
353: # that it is a parked greenlet (the callablle is a
354: # ``greenlet.switch`` method) and we can determine the hub
355: # that the greenlet belongs to (either its parent, or, in the
356: # case of a main greenlet, find a hub with the same parent as
357: # this greenlet object) then:
358:
359: # Move this to be a callback in that thread.
360: # (This relies on holding the GIL *or* ``Hub.loop.run_callback`` being
361: # thread-safe! Note that the CFFI implementations are definitely
362: # NOT thread-safe. TODO: Make them? Or an alternative?)
363: #
364: # Otherwise, print some error messages.
365:
366: # TODO: Inline this for individual links. That handles the
367: # "only while ready" case automatically. Be careful about locking in that case.
368: #
369: # TODO: Add a 'strict' mode that prevents doing this dance, since it's
370: # inherently not safe.
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379:
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381:
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388:
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goto __pyx_L12_break;
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394:
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/* … */
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/* … */
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PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "get");
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399:
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/* … */
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403: # We couldn't handle it
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407:
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531:
532: Subclasses should reset themselves to an initial state. This
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