Generated by Cython 3.0.0a11

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_2 = PyList_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 17, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_2);__Pyx_INCREF(__pyx_n_s_sleep);__Pyx_GIVEREF(__pyx_n_s_sleep);PyList_SET_ITEM(__pyx_t_2, 0, __pyx_n_s_sleep);__pyx_t_3 = __Pyx_Import(__pyx_n_s_time, __pyx_t_2, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 17, __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_sleep); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 17, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_2);__Pyx_INCREF(__pyx_t_2);__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_2);__Pyx_GIVEREF(__pyx_t_2);__Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;__Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 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);PyList_SET_ITEM(__pyx_t_3, 0, __pyx_n_s_monotonic);__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
__pyx_t_3 = PyList_New(1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 21, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);__Pyx_INCREF(__pyx_n_s_LoopExit);__Pyx_GIVEREF(__pyx_n_s_LoopExit);PyList_SET_ITEM(__pyx_t_3, 0, __pyx_n_s_LoopExit);__pyx_t_2 = __Pyx_Import(__pyx_n_s_gevent_exceptions, __pyx_t_3, 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 21, __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_LoopExit); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 21, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);__Pyx_INCREF(__pyx_t_3);__Pyx_XGOTREF(__pyx_v_6gevent_19_gevent_c_semaphore_LoopExit);__Pyx_DECREF_SET(__pyx_v_6gevent_19_gevent_c_semaphore_LoopExit, __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;
+022: from gevent.timeout import Timeout
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 023: 
+024: def _get_linkable():
/* Python wrapper */static PyObject *__pyx_pw_6gevent_19_gevent_c_semaphore_1_get_linkable(PyObject *__pyx_self, CYTHON_UNUSED PyObject *unused); /*proto*/PyDoc_STRVAR(__pyx_doc_6gevent_19_gevent_c_semaphore__get_linkable, "_get_linkable()");static PyMethodDef __pyx_mdef_6gevent_19_gevent_c_semaphore_1_get_linkable = {"_get_linkable", (PyCFunction)__pyx_pw_6gevent_19_gevent_c_semaphore_1_get_linkable, METH_NOARGS, __pyx_doc_6gevent_19_gevent_c_semaphore__get_linkable};static PyObject *__pyx_pw_6gevent_19_gevent_c_semaphore_1_get_linkable(PyObject *__pyx_self, CYTHON_UNUSED PyObject *unused) {CYTHON_UNUSED PyObject *const *__pyx_kwvalues = __Pyx_KwValues_VARARGS(__pyx_args, __pyx_nargs);PyObject *__pyx_r = 0;__Pyx_RefNannyDeclarations__Pyx_RefNannySetupContext("_get_linkable (wrapper)", 0);__pyx_r = __pyx_pf_6gevent_19_gevent_c_semaphore__get_linkable(__pyx_self);/* function exit code */__Pyx_RefNannyFinishContext();return __pyx_r;}static PyObject *__pyx_pf_6gevent_19_gevent_c_semaphore__get_linkable(CYTHON_UNUSED PyObject *__pyx_self) {PyObject *__pyx_v_x = NULL;PyObject *__pyx_r = NULL;__Pyx_RefNannyDeclarations__Pyx_RefNannySetupContext("_get_linkable", 0);/* function exit code */__pyx_L1_error:;__Pyx_XDECREF(__pyx_t_1);__Pyx_XDECREF(__pyx_t_2);__Pyx_AddTraceback("gevent._gevent_c_semaphore._get_linkable", __pyx_clineno, __pyx_lineno, __pyx_filename);__pyx_r = NULL;__pyx_L0:;__Pyx_XDECREF(__pyx_v_x);__Pyx_XGIVEREF(__pyx_r);__Pyx_RefNannyFinishContext();return __pyx_r;}__pyx_tuple__6 = PyTuple_Pack(1, __pyx_n_s_x); if (unlikely(!__pyx_tuple__6)) __PYX_ERR(0, 24, __pyx_L1_error)__Pyx_GOTREF(__pyx_tuple__6);__Pyx_GIVEREF(__pyx_tuple__6);__pyx_t_3 = __Pyx_CyFunction_New(&__pyx_mdef_6gevent_19_gevent_c_semaphore_1_get_linkable, 0, __pyx_n_s_get_linkable, NULL, __pyx_n_s_gevent__gevent_c_semaphore, __pyx_d, ((PyObject *)__pyx_codeobj__7)); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 24, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);if (PyDict_SetItem(__pyx_d, __pyx_n_s_get_linkable, __pyx_t_3) < 0) __PYX_ERR(0, 24, __pyx_L1_error)__Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;__pyx_codeobj__7 = (PyObject*)__Pyx_PyCode_New(0, 0, 0, 1, 0, CO_OPTIMIZED|CO_NEWLOCALS, __pyx_empty_bytes, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_tuple__6, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_kp_s_src_gevent__semaphore_py, __pyx_n_s_get_linkable, 24, __pyx_empty_bytes); if (unlikely(!__pyx_codeobj__7)) __PYX_ERR(0, 24, __pyx_L1_error)
+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_3, __pyx_n_s_get_linkable); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 27, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);__pyx_t_2 = __Pyx_PyObject_CallNoArg(__pyx_t_3); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 27, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_2);__Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;__pyx_t_3 = __Pyx_Globals(); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 27, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);if (unlikely((PyDict_SetItem(__pyx_t_3, __pyx_n_s_AbstractLinkable, __pyx_t_2) < 0))) __PYX_ERR(0, 27, __pyx_L1_error)__Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;__Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 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_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);PyList_SET_ITEM(__pyx_t_2, 0, __pyx_n_s_get_hub_if_exists);__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
__pyx_t_3 = PyList_New(1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 31, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);__Pyx_INCREF(__pyx_n_s_get_hub);__Pyx_GIVEREF(__pyx_n_s_get_hub);PyList_SET_ITEM(__pyx_t_3, 0, __pyx_n_s_get_hub);__pyx_t_2 = __Pyx_Import(__pyx_n_s_gevent__hub_local, __pyx_t_3, 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 31, __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_get_hub); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 31, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_3);if (PyDict_SetItem(__pyx_d, __pyx_n_s_get_hub_noargs, __pyx_t_3) < 0) __PYX_ERR(0, 31, __pyx_L1_error)__Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;__Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
+032: from gevent.hub import spawn_raw
__pyx_t_2 = PyList_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 32, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_2);__Pyx_INCREF(__pyx_n_s_spawn_raw);__Pyx_GIVEREF(__pyx_n_s_spawn_raw);PyList_SET_ITEM(__pyx_t_2, 0, __pyx_n_s_spawn_raw);__pyx_t_3 = __Pyx_Import(__pyx_n_s_gevent_hub, __pyx_t_2, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 32, __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_spawn_raw); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 32, __pyx_L1_error)__Pyx_GOTREF(__pyx_t_2);__Pyx_INCREF(__pyx_t_2);__Pyx_XGOTREF(__pyx_v_6gevent_19_gevent_c_semaphore_spawn_raw);__Pyx_DECREF_SET(__pyx_v_6gevent_19_gevent_c_semaphore_spawn_raw, __pyx_t_2);__Pyx_GIVEREF(__pyx_t_2);__Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;__Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 033: 
 034: class _LockReleaseLink(object):
 035:     __slots__ = (
+036:         'lock',
if (PyDict_SetItem((PyObject *)__pyx_ptype_6gevent_19_gevent_c_semaphore__LockReleaseLink->tp_dict, __pyx_n_s_slots, __pyx_tuple__8) < 0) __PYX_ERR(0, 35, __pyx_L1_error)PyType_Modified(__pyx_ptype_6gevent_19_gevent_c_semaphore__LockReleaseLink);__pyx_tuple__8 = PyTuple_Pack(1, __pyx_n_s_lock); if (unlikely(!__pyx_tuple__8)) __PYX_ERR(0, 36, __pyx_L1_error)__Pyx_GOTREF(__pyx_tuple__8);__Pyx_GIVEREF(__pyx_tuple__8);
 037:     )
 038: 
+039:     def __init__(self, lock):
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+040:         self.lock = lock
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+043:         self.lock.release()
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+045: _UNSET = object()
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+046: _MULTI = object()
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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: 
+092:     def __init__(self, value=1, hub=None):
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 181:         """
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 183: 
 184:         Acquire the semaphore.
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 186:         .. note:: If this semaphore was initialized with a *value* of 0,
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 209:         # We conceptually now belong to the hub of the thread that
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 285:         # If we fail to switch to a greenlet in another thread to send
 286:         # a notification, just re-queue it, in the hopes that the
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 288:         #
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 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,
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 302:         # ``TestSemaphoreMultiThread.test_dueling_threads_with_hub``,
 303:         # but ONLY when running in PURE_PYTHON mode.
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 318:         # up. In general, we can't use a Python-level ``Lock`` because
 319:         #
 320:         # (1) it doesn't support a timeout on all platforms; and
 321:         # (2) we don't want to block this hub from running.
 322:         #
 323:         # So we need to do so in a way that cooperates with *two*
 324:         # hubs. That's what an async watcher is built for.
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 342:             # to block and no reason to try to avoid blocking, so using a native
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 345: 
 346:         # We have a hub we don't want to block. Use an async watcher
 347:         # and ask the next releaser of this object to wake us up.
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 351: 
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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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