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83 lines
2.3 KiB
C
Vendored
83 lines
2.3 KiB
C
Vendored
/*
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Copyright (c) 2013 mingw-w64 project
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Copyright (c) 2015 Intel Corporation
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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/* public header files */
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#include "pthread.h"
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/* internal header files */
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#include "misc.h"
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/* We use the pthread_spinlock_t itself as a lock:
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-1 is free, 0 is locked.
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(This is dictated by PTHREAD_SPINLOCK_INITIALIZER, which we can't change
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without breaking binary compatibility.) */
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typedef intptr_t spinlock_word_t;
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int
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pthread_spin_init (pthread_spinlock_t *lock, int pshared)
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{
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spinlock_word_t *lk = (spinlock_word_t *)lock;
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*lk = -1;
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return 0;
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}
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int
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pthread_spin_destroy (pthread_spinlock_t *lock)
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{
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return 0;
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}
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int
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pthread_spin_lock (pthread_spinlock_t *lock)
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{
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volatile spinlock_word_t *lk = (volatile spinlock_word_t *)lock;
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while (unlikely(InterlockedExchangePointer((PVOID volatile *)lk, 0) == 0))
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do {
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YieldProcessor();
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} while (*lk == 0);
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return 0;
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}
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int
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pthread_spin_trylock (pthread_spinlock_t *lock)
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{
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spinlock_word_t *lk = (spinlock_word_t *)lock;
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return InterlockedExchangePointer((PVOID volatile *)lk, 0) == 0 ? EBUSY : 0;
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}
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int
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pthread_spin_unlock (pthread_spinlock_t *lock)
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{
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volatile spinlock_word_t *lk = (volatile spinlock_word_t *)lock;
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*lk = -1;
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return 0;
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}
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