Generated by Cython 3.0a6
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
__pyx_t_1 = PyList_New(1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 17, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_INCREF(__pyx_n_s_sleep); __Pyx_GIVEREF(__pyx_n_s_sleep); PyList_SET_ITEM(__pyx_t_1, 0, __pyx_n_s_sleep); __pyx_t_2 = __Pyx_Import(__pyx_n_s_time, __pyx_t_1, 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 17, __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_sleep); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 17, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_INCREF(__pyx_t_1); __Pyx_XGOTREF(__pyx_v_6gevent_19_gevent_c_semaphore__native_sleep); __Pyx_DECREF_SET(__pyx_v_6gevent_19_gevent_c_semaphore__native_sleep, __pyx_t_1); __Pyx_GIVEREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
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')
__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
__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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044:
+045: 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;
046: """
047: Semaphore(value=1) -> Semaphore
048:
049: .. seealso:: :class:`BoundedSemaphore` for a safer version that prevents
050: some classes of bugs. If unsure, most users should opt for `BoundedSemaphore`.
051:
052: A semaphore manages a counter representing the number of `release`
053: calls minus the number of `acquire` calls, plus an initial value.
054: The `acquire` method blocks if necessary until it can return
055: without making the counter negative. A semaphore does not track ownership
056: by greenlets; any greenlet can call `release`, whether or not it has previously
057: called `acquire`.
058:
059: If not given, ``value`` defaults to 1.
060:
061: The semaphore is a context manager and can be used in ``with`` statements.
062:
063: This Semaphore's ``__exit__`` method does not call the trace function
064: on CPython, but does under PyPy.
065:
066: .. versionchanged:: 1.4.0
067: Document that the order in which waiters are awakened is not specified. It was not
068: specified previously, but due to CPython implementation quirks usually went in FIFO order.
069: .. versionchanged:: 1.5a3
070: Waiting greenlets are now awakened in the order in which they waited.
071: .. versionchanged:: 1.5a3
072: The low-level ``rawlink`` method (most users won't use this) now automatically
073: unlinks waiters before calling them.
074: .. versionchanged:: 20.12.0
075: Improved support for multi-threaded usage. When multi-threaded usage is detected,
076: instances will no longer create the thread's hub if it's not present.
077: """
078:
079: __slots__ = (
+080: 'counter',
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081: # Integer. Set to 0 initially. Set to the ident of the first
082: # thread that acquires us. If we later see a different thread
083: # ident, set to -1.
084: '_multithreaded',
085: )
086:
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176: """
177: acquire(blocking=True, timeout=None) -> bool
178:
179: Acquire the semaphore.
180:
181: .. note:: If this semaphore was initialized with a *value* of 0,
182: this method will block forever (unless a timeout is given or blocking is
183: set to false).
184:
185: :keyword bool blocking: If True (the default), this function will block
186: until the semaphore is acquired.
187: :keyword float timeout: If given, and *blocking* is true,
188: specifies the maximum amount of seconds
189: this method will block.
190: :return: A `bool` indicating whether the semaphore was acquired.
191: If ``blocking`` is True and ``timeout`` is None (the default), then
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196: """
197: # pylint:disable=too-many-return-statements,too-many-branches
198: # Sadly, the body of this method is rather complicated.
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213: # My hub belongs to some other thread. We didn't release the GIL/object lock
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__pyx_v_self->counter = (__pyx_v_self->counter - 1);
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224:
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349: # acquire() should succeed. But sometimes we get spurious notifications?
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467: """
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484:
485:
486: # By building the semaphore with Cython under PyPy, we get
487: # atomic operations (specifically, exiting/releasing), at the
488: # cost of some speed (one trivial semaphore micro-benchmark put the pure-python version
489: # at around 1s and the compiled version at around 4s). Some clever subclassing
490: # and having only the bare minimum be in cython might help reduce that penalty.
491: # NOTE: You must use version 0.23.4 or later to avoid a memory leak.
492: # https://mail.python.org/pipermail/cython-devel/2015-October/004571.html
493: # However, that's all for naught on up to and including PyPy 4.0.1 which
494: # have some serious crashing bugs with GC interacting with cython.
495: # It hasn't been tested since then, and PURE_PYTHON is assumed to be true
496: # for PyPy in all cases anyway, so this does nothing.
497:
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