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: _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_2 = PyList_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 19, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_INCREF(__pyx_n_s_monotonic); __Pyx_GIVEREF(__pyx_n_s_monotonic); PyList_SET_ITEM(__pyx_t_2, 0, __pyx_n_s_monotonic); __pyx_t_1 = __Pyx_Import(__pyx_n_s_gevent__compat, __pyx_t_2, 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 19, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __pyx_t_2 = __Pyx_ImportFrom(__pyx_t_1, __pyx_n_s_monotonic); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 19, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_INCREF(__pyx_t_2); __Pyx_XGOTREF(__pyx_v_6gevent_19_gevent_c_semaphore_monotonic); __Pyx_DECREF_SET(__pyx_v_6gevent_19_gevent_c_semaphore_monotonic, __pyx_t_2); __Pyx_GIVEREF(__pyx_t_2); __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 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')
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+026: return x._abstract_linkable.AbstractLinkable
__Pyx_XDECREF(__pyx_r); __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_x, __pyx_n_s_abstract_linkable); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 26, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_t_1, __pyx_n_s_AbstractLinkable); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 26, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; __pyx_r = __pyx_t_2; __pyx_t_2 = 0; goto __pyx_L0;
+027: locals()['AbstractLinkable'] = _get_linkable()
__Pyx_GetModuleGlobalName(__pyx_t_2, __pyx_n_s_get_linkable); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 27, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __pyx_t_1 = __Pyx_PyObject_CallNoArg(__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 27, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __pyx_t_2 = __Pyx_Globals(); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 27, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); if (unlikely((PyDict_SetItem(__pyx_t_2, __pyx_n_s_AbstractLinkable, __pyx_t_1) < 0))) __PYX_ERR(0, 27, __pyx_L1_error) __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+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_1 = PyList_New(1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_INCREF(__pyx_n_s_get_hub_if_exists); __Pyx_GIVEREF(__pyx_n_s_get_hub_if_exists); PyList_SET_ITEM(__pyx_t_1, 0, __pyx_n_s_get_hub_if_exists); __pyx_t_2 = __Pyx_Import(__pyx_n_s_gevent__hub_local, __pyx_t_1, 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; __pyx_t_1 = __Pyx_ImportFrom(__pyx_t_2, __pyx_n_s_get_hub_if_exists); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); if (PyDict_SetItem(__pyx_d, __pyx_n_s_get_hub_if_exists, __pyx_t_1) < 0) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
+031: from gevent._hub_local import get_hub
__pyx_t_2 = PyList_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 31, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_INCREF(__pyx_n_s_get_hub); __Pyx_GIVEREF(__pyx_n_s_get_hub); PyList_SET_ITEM(__pyx_t_2, 0, __pyx_n_s_get_hub); __pyx_t_1 = __Pyx_Import(__pyx_n_s_gevent__hub_local, __pyx_t_2, 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 31, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __pyx_t_2 = __Pyx_ImportFrom(__pyx_t_1, __pyx_n_s_get_hub); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 31, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); if (PyDict_SetItem(__pyx_d, __pyx_n_s_get_hub_noargs, __pyx_t_2) < 0) __PYX_ERR(0, 31, __pyx_L1_error) __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+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:
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041:
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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:
082: __slots__ = (
+083: 'counter',
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084: # long integer, signed (Py2) or unsigned (Py3); see comments
085: # in the .pxd file for why we store as Python object. Set to ``_UNSET``
086: # initially. Set to the ident of the first thread that
087: # acquires us. If we later see a different thread ident, set
088: # to ``_MULTI``.
089: '_multithreaded',
090: )
091:
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181: """
182: acquire(blocking=True, timeout=None) -> bool
183:
184: Acquire the semaphore.
185:
186: .. note:: If this semaphore was initialized with a *value* of 0,
187: this method will block forever (unless a timeout is given or blocking is
188: set to false).
189:
190: :keyword bool blocking: If True (the default), this function will block
191: until the semaphore is acquired.
192: :keyword float timeout: If given, and *blocking* is true,
193: specifies the maximum amount of seconds
194: this method will block.
195: :return: A `bool` indicating whether the semaphore was acquired.
196: If ``blocking`` is True and ``timeout`` is None (the default), then
197: (so long as this semaphore was initialized with a size greater than 0)
198: this will always return True. If a timeout was given, and it expired before
199: the semaphore was acquired, False will be returned. (Note that this can still
200: raise a ``Timeout`` exception, if some other caller had already started a timer.)
201: """
202: # pylint:disable=too-many-return-statements,too-many-branches
203: # Sadly, the body of this method is rather complicated.
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208:
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210: # called this, whether or not we have to block. Note that we
211: # cannot force it to be created yet, because Semaphore is used
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218: # My hub belongs to some other thread. We didn't release the GIL/object lock
219: # by raising the exception, so we know this is still true.
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225:
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__pyx_t_8 = ((__pyx_v_self->counter > 0) != 0); if (__pyx_t_8) { /* … */ }
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__pyx_v_self->counter = (__pyx_v_self->counter - 1);
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229:
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__pyx_t_8 = ((!(__pyx_v_blocking != 0)) != 0); if (__pyx_t_8) { /* … */ }
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232:
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__pyx_t_7 = (__pyx_v_self->_multithreaded != __pyx_v_6gevent_19_gevent_c_semaphore__MULTI); __pyx_t_20 = (__pyx_t_7 != 0); if (__pyx_t_20) { } else { __pyx_t_8 = __pyx_t_20; goto __pyx_L27_bool_binop_done; } __pyx_t_20 = (((PyObject *)__pyx_v_self->__pyx_base.hub) == Py_None); __pyx_t_7 = (__pyx_t_20 != 0); __pyx_t_8 = __pyx_t_7; __pyx_L27_bool_binop_done:; if (__pyx_t_8) { /* … */ }
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290: # this notification to get run sometime in the future by
291: # scheduling a callback in the other thread. The algorithm
292: # that we use to handle cross-thread locking/unlocking was
293: # designed before the schedule-a-callback mechanism was
294: # implemented. If we allow this to be run as a callback, we
295: # can find ourself the victim of ``InvalidSwitchError`` (or
296: # worse, silent corruption) because the switch can come at an
297: # unexpected time: *after* the destination thread has already
298: # acquired the lock.
299: #
300: # This manifests in a fairly reliable test failure,
301: # ``gevent.tests.test__semaphore``
302: # ``TestSemaphoreMultiThread.test_dueling_threads_with_hub``,
303: # but ONLY when running in PURE_PYTHON mode.
304: #
305: # TODO: Maybe we can rewrite that part of the algorithm to be friendly to
306: # running the callbacks?
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473: """
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510:
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514:
515:
516: # By building the semaphore with Cython under PyPy, we get
517: # atomic operations (specifically, exiting/releasing), at the
518: # cost of some speed (one trivial semaphore micro-benchmark put the pure-python version
519: # at around 1s and the compiled version at around 4s). Some clever subclassing
520: # and having only the bare minimum be in cython might help reduce that penalty.
521: # NOTE: You must use version 0.23.4 or later to avoid a memory leak.
522: # https://mail.python.org/pipermail/cython-devel/2015-October/004571.html
523: # However, that's all for naught on up to and including PyPy 4.0.1 which
524: # have some serious crashing bugs with GC interacting with cython.
525: # It hasn't been tested since then, and PURE_PYTHON is assumed to be true
526: # for PyPy in all cases anyway, so this does nothing.
527:
+528: from gevent._util import import_c_accel
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