Generated by Cython 3.0.11
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: _semaphore.c
+001: # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False
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002: ###
003: # This file is ``gevent._semaphore`` so that it can be compiled by Cython
004: # individually. However, this is not the place to import from. Everyone,
005: # gevent internal code included, must import from ``gevent.lock``.
006: # The only exception are .pxd files which need access to the
007: # C code; the PURE_PYTHON things that have to happen and which are
008: # handled in ``gevent.lock``, do not apply to them.
009: ###
010: from __future__ import print_function, absolute_import, division
011:
+012: __all__ = [
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013: 'Semaphore',
014: 'BoundedSemaphore',
015: ]
016:
+017: from time import sleep as _native_sleep
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018:
+019: from gevent._compat import monotonic
__pyx_t_3 = PyList_New(1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 19, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); __Pyx_INCREF(__pyx_n_s_monotonic); __Pyx_GIVEREF(__pyx_n_s_monotonic); if (__Pyx_PyList_SET_ITEM(__pyx_t_3, 0, __pyx_n_s_monotonic)) __PYX_ERR(0, 19, __pyx_L1_error); __pyx_t_2 = __Pyx_Import(__pyx_n_s_gevent__compat, __pyx_t_3, 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 19, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; __pyx_t_3 = __Pyx_ImportFrom(__pyx_t_2, __pyx_n_s_monotonic); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 19, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); __Pyx_INCREF(__pyx_t_3); __Pyx_XGOTREF(__pyx_v_6gevent_19_gevent_c_semaphore_monotonic); __Pyx_DECREF_SET(__pyx_v_6gevent_19_gevent_c_semaphore_monotonic, __pyx_t_3); __Pyx_GIVEREF(__pyx_t_3); __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
+020: from gevent.exceptions import InvalidThreadUseError
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+021: from gevent.exceptions import LoopExit
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+022: from gevent.timeout import Timeout
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023:
+024: def _get_linkable():
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+025: x = __import__('gevent._abstract_linkable')
__pyx_t_1 = __Pyx_PyObject_Call(__pyx_builtin___import__, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 25, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __pyx_v_x = __pyx_t_1; __pyx_t_1 = 0; /* … */ __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_gevent__abstract_linkable); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 25, __pyx_L1_error) __Pyx_GOTREF(__pyx_tuple_); __Pyx_GIVEREF(__pyx_tuple_);
+026: return x._abstract_linkable.AbstractLinkable
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+027: locals()['AbstractLinkable'] = _get_linkable()
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+028: del _get_linkable
if (__Pyx_PyObject_DelAttrStr(__pyx_m, __pyx_n_s_get_linkable) < 0) __PYX_ERR(0, 28, __pyx_L1_error)
029:
+030: from gevent._hub_local import get_hub_if_exists
__pyx_t_2 = PyList_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_INCREF(__pyx_n_s_get_hub_if_exists); __Pyx_GIVEREF(__pyx_n_s_get_hub_if_exists); if (__Pyx_PyList_SET_ITEM(__pyx_t_2, 0, __pyx_n_s_get_hub_if_exists)) __PYX_ERR(0, 30, __pyx_L1_error); __pyx_t_3 = __Pyx_Import(__pyx_n_s_gevent__hub_local, __pyx_t_2, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __pyx_t_2 = __Pyx_ImportFrom(__pyx_t_3, __pyx_n_s_get_hub_if_exists); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); if (PyDict_SetItem(__pyx_d, __pyx_n_s_get_hub_if_exists, __pyx_t_2) < 0) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
+031: from gevent._hub_local import get_hub
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+032: from gevent.hub import spawn_raw
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033:
034: class _LockReleaseLink(object):
035: __slots__ = (
+036: 'lock',
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037: )
038:
+039: def __init__(self, lock):
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041:
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+043: self.lock.release()
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044:
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047:
+048: class Semaphore(AbstractLinkable): # pylint:disable=undefined-variable
struct __pyx_vtabstruct_6gevent_19_gevent_c_semaphore_Semaphore { struct __pyx_vtabstruct_6gevent_27_gevent_c_abstract_linkable_AbstractLinkable __pyx_base; int (*locked)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, int __pyx_skip_dispatch); int (*release)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, int __pyx_skip_dispatch); PyObject *(*_start_notify)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, int __pyx_skip_dispatch); int (*wait)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, int __pyx_skip_dispatch, struct __pyx_opt_args_6gevent_19_gevent_c_semaphore_9Semaphore_wait *__pyx_optional_args); int (*acquire)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, int __pyx_skip_dispatch, struct __pyx_opt_args_6gevent_19_gevent_c_semaphore_9Semaphore_acquire *__pyx_optional_args); PyObject *(*__pyx___enter__)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, int __pyx_skip_dispatch); PyObject *(*__pyx___exit__)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, PyObject *, PyObject *, PyObject *, int __pyx_skip_dispatch); PyObject *(*_Semaphore__acquire_from_other_thread)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, PyObject *, int, PyObject *); PyObject *(*_Semaphore__acquire_from_other_thread_cb)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, PyObject *, int, PyObject *, PyObject *, int __pyx_skip_dispatch); PyObject *(*_Semaphore__add_link)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, PyObject *); PyObject *(*_Semaphore__acquire_using_two_hubs)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, struct __pyx_obj_6gevent_29_gevent_c_greenlet_primitives_SwitchOutGreenletWithLoop *, PyObject *, PyObject *); PyObject *(*_Semaphore__acquire_using_other_hub)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, struct __pyx_obj_6gevent_29_gevent_c_greenlet_primitives_SwitchOutGreenletWithLoop *, PyObject *); int (*_Semaphore__acquire_without_hubs)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, PyObject *); int (*_Semaphore__spin_on_native_lock)(struct __pyx_obj_6gevent_19_gevent_c_semaphore_Semaphore *, PyObject *, PyObject *); }; static struct __pyx_vtabstruct_6gevent_19_gevent_c_semaphore_Semaphore *__pyx_vtabptr_6gevent_19_gevent_c_semaphore_Semaphore;
049: """
050: Semaphore(value=1) -> Semaphore
051:
052: .. seealso:: :class:`BoundedSemaphore` for a safer version that prevents
053: some classes of bugs. If unsure, most users should opt for `BoundedSemaphore`.
054:
055: A semaphore manages a counter representing the number of `release`
056: calls minus the number of `acquire` calls, plus an initial value.
057: The `acquire` method blocks if necessary until it can return
058: without making the counter negative. A semaphore does not track ownership
059: by greenlets; any greenlet can call `release`, whether or not it has previously
060: called `acquire`.
061:
062: If not given, ``value`` defaults to 1.
063:
064: The semaphore is a context manager and can be used in ``with`` statements.
065:
066: This Semaphore's ``__exit__`` method does not call the trace function
067: on CPython, but does under PyPy.
068:
069: .. versionchanged:: 1.4.0
070: Document that the order in which waiters are awakened is not specified. It was not
071: specified previously, but due to CPython implementation quirks usually went in FIFO order.
072: .. versionchanged:: 1.5a3
073: Waiting greenlets are now awakened in the order in which they waited.
074: .. versionchanged:: 1.5a3
075: The low-level ``rawlink`` method (most users won't use this) now automatically
076: unlinks waiters before calling them.
077: .. versionchanged:: 20.12.0
078: Improved support for multi-threaded usage. When multi-threaded usage is detected,
079: instances will no longer create the thread's hub if it's not present.
080:
081: .. versionchanged:: 24.2.1
082: Uses Python 3 native lock timeouts for cross-thread operations instead
083: of spinning.
084: """
085:
086: __slots__ = (
+087: 'counter',
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088: # long integer, signed (Py2) or unsigned (Py3); see comments
089: # in the .pxd file for why we store as Python object. Set to ``_UNSET``
090: # initially. Set to the ident of the first thread that
091: # acquires us. If we later see a different thread ident, set
092: # to ``_MULTI``.
093: '_multithreaded',
094: )
095:
+096: def __init__(self, value=1, hub=None):
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+097: self.counter = value
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+098: if self.counter < 0: # Do the check after Cython native int conversion
__pyx_t_2 = (__pyx_v_self->counter < 0); if (unlikely(__pyx_t_2)) { /* … */ }
+099: raise ValueError("semaphore initial value must be >= 0")
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185: """
186: acquire(blocking=True, timeout=None) -> bool
187:
188: Acquire the semaphore.
189:
190: .. note:: If this semaphore was initialized with a *value* of 0,
191: this method will block forever (unless a timeout is given or blocking is
192: set to false).
193:
194: :keyword bool blocking: If True (the default), this function will block
195: until the semaphore is acquired.
196: :keyword float timeout: If given, and *blocking* is true,
197: specifies the maximum amount of seconds
198: this method will block.
199: :return: A `bool` indicating whether the semaphore was acquired.
200: If ``blocking`` is True and ``timeout`` is None (the default), then
201: (so long as this semaphore was initialized with a size greater than 0)
202: this will always return True. If a timeout was given, and it expired before
203: the semaphore was acquired, False will be returned. (Note that this can still
204: raise a ``Timeout`` exception, if some other caller had already started a timer.)
205: """
206: # pylint:disable=too-many-return-statements,too-many-branches
207: # Sadly, the body of this method is rather complicated.
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+209: self._multithreaded = self._get_thread_ident()
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212:
213: # We conceptually now belong to the hub of the thread that
214: # called this, whether or not we have to block. Note that we
215: # cannot force it to be created yet, because Semaphore is used
216: # by importlib.ModuleLock which is used when importing the hub
217: # itself! This also checks for cross-thread issues.
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289: # If we fail to switch to a greenlet in another thread to send
290: # a notification, just re-queue it, in the hopes that the
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292: #
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295: # scheduling a callback in the other thread. The algorithm
296: # that we use to handle cross-thread locking/unlocking was
297: # designed before the schedule-a-callback mechanism was
298: # implemented. If we allow this to be run as a callback, we
299: # can find ourself the victim of ``InvalidSwitchError`` (or
300: # worse, silent corruption) because the switch can come at an
301: # unexpected time: *after* the destination thread has already
302: # acquired the lock.
303: #
304: # This manifests in a fairly reliable test failure,
305: # ``gevent.tests.test__semaphore``
306: # ``TestSemaphoreMultiThread.test_dueling_threads_with_hub``,
307: # but ONLY when running in PURE_PYTHON mode.
308: #
309: # TODO: Maybe we can rewrite that part of the algorithm to be friendly to
310: # running the callbacks?
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321: # Some other hub owns this object. We must ask it to wake us
322: # up. In general, we can't use a Python-level ``Lock`` because
323: #
324: # (1) it doesn't support a timeout on all platforms; and
325: # (2) we don't want to block this hub from running.
326: #
327: # So we need to do so in a way that cooperates with *two*
328: # hubs. That's what an async watcher is built for.
329: #
330: # Of course, if we don't actually have two hubs, then we must find some other
331: # solution. That involves using a lock.
332:
333: # We have to take an action that drops the GIL and drops the object lock
334: # to allow the main thread (the thread for our hub) to advance.
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343: # Probably a background worker thread. We don't want to create
344: # the hub if not needed, and since it didn't exist there are no
345: # other greenlets that we could yield to anyway, so there's nothing
346: # to block and no reason to try to avoid blocking, so using a native
347: # lock is the simplest way to go.
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355:
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357: hub_for_this_thread,
358: current_greenlet,
359: timeout):
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377:
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420: # We MUST use a blocking acquire here, or at least be sure we keep going
421: # until we acquire it. If we timed out waiting here,
422: # just before the callback runs, then we would be out of sync.
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425:
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468:
469:
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471: """
472: BoundedSemaphore(value=1) -> BoundedSemaphore
473:
474: A bounded semaphore checks to make sure its current value doesn't
475: exceed its initial value. If it does, :class:`ValueError` is
476: raised. In most situations semaphores are used to guard resources
477: with limited capacity. If the semaphore is released too many times
478: it's a sign of a bug.
479:
480: If not given, *value* defaults to 1.
481: """
482:
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512:
513:
514: # By building the semaphore with Cython under PyPy, we get
515: # atomic operations (specifically, exiting/releasing), at the
516: # cost of some speed (one trivial semaphore micro-benchmark put the pure-python version
517: # at around 1s and the compiled version at around 4s). Some clever subclassing
518: # and having only the bare minimum be in cython might help reduce that penalty.
519: # NOTE: You must use version 0.23.4 or later to avoid a memory leak.
520: # https://mail.python.org/pipermail/cython-devel/2015-October/004571.html
521: # However, that's all for naught on up to and including PyPy 4.0.1 which
522: # have some serious crashing bugs with GC interacting with cython.
523: # It hasn't been tested since then, and PURE_PYTHON is assumed to be true
524: # for PyPy in all cases anyway, so this does nothing.
525:
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