115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/**************************************************************************
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*
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* Copyright 1999-2006 Brian Paul
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* Copyright 2008 VMware, Inc.
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* All Rights Reserved.
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*
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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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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR 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
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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*
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* Thread, mutex, condition variable, barrier, semaphore and
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* thread-specific data functions.
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*/
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#ifndef OS_THREAD_H_
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#define OS_THREAD_H_
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#include "pipe/p_compiler.h"
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#include "util/u_debug.h" /* for assert */
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#include "util/u_thread.h"
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#define pipe_mutex_assert_locked(mutex) \
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__pipe_mutex_assert_locked(&(mutex))
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static inline void
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__pipe_mutex_assert_locked(mtx_t *mutex)
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{
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#ifdef DEBUG
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/* NOTE: this would not work for recursive mutexes, but
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* mtx_t doesn't support those
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*/
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int ret = mtx_trylock(mutex);
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assert(ret == thrd_busy);
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if (ret == thrd_success)
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mtx_unlock(mutex);
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#else
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(void)mutex;
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#endif
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}
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/*
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* Semaphores
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*/
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typedef struct
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{
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mtx_t mutex;
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cnd_t cond;
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int counter;
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} pipe_semaphore;
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static inline void
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pipe_semaphore_init(pipe_semaphore *sema, int init_val)
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{
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(void) mtx_init(&sema->mutex, mtx_plain);
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cnd_init(&sema->cond);
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sema->counter = init_val;
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}
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static inline void
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pipe_semaphore_destroy(pipe_semaphore *sema)
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{
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mtx_destroy(&sema->mutex);
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cnd_destroy(&sema->cond);
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}
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/** Signal/increment semaphore counter */
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static inline void
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pipe_semaphore_signal(pipe_semaphore *sema)
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{
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mtx_lock(&sema->mutex);
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sema->counter++;
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cnd_signal(&sema->cond);
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mtx_unlock(&sema->mutex);
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}
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/** Wait for semaphore counter to be greater than zero */
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static inline void
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pipe_semaphore_wait(pipe_semaphore *sema)
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{
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mtx_lock(&sema->mutex);
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while (sema->counter <= 0) {
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cnd_wait(&sema->cond, &sema->mutex);
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}
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sema->counter--;
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mtx_unlock(&sema->mutex);
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}
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#endif /* OS_THREAD_H_ */
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