| /************************************************************************** |
| * |
| * Copyright 1999-2006 Brian Paul |
| * Copyright 2008 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| **************************************************************************/ |
| |
| |
| /** |
| * @file |
| * |
| * Thread, mutex, condition variable, barrier, semaphore and |
| * thread-specific data functions. |
| */ |
| |
| |
| #ifndef OS_THREAD_H_ |
| #define OS_THREAD_H_ |
| |
| |
| #include "pipe/p_compiler.h" |
| #include "util/u_debug.h" /* for assert */ |
| #include "util/u_thread.h" |
| |
| |
| #define pipe_mutex_assert_locked(mutex) \ |
| __pipe_mutex_assert_locked(&(mutex)) |
| |
| static inline void |
| __pipe_mutex_assert_locked(mtx_t *mutex) |
| { |
| #ifdef DEBUG |
| /* NOTE: this would not work for recursive mutexes, but |
| * mtx_t doesn't support those |
| */ |
| int ret = mtx_trylock(mutex); |
| assert(ret == thrd_busy); |
| if (ret == thrd_success) |
| mtx_unlock(mutex); |
| #else |
| (void)mutex; |
| #endif |
| } |
| |
| |
| /* |
| * Semaphores |
| */ |
| |
| typedef struct |
| { |
| mtx_t mutex; |
| cnd_t cond; |
| int counter; |
| } pipe_semaphore; |
| |
| |
| static inline void |
| pipe_semaphore_init(pipe_semaphore *sema, int init_val) |
| { |
| (void) mtx_init(&sema->mutex, mtx_plain); |
| cnd_init(&sema->cond); |
| sema->counter = init_val; |
| } |
| |
| static inline void |
| pipe_semaphore_destroy(pipe_semaphore *sema) |
| { |
| mtx_destroy(&sema->mutex); |
| cnd_destroy(&sema->cond); |
| } |
| |
| /** Signal/increment semaphore counter */ |
| static inline void |
| pipe_semaphore_signal(pipe_semaphore *sema) |
| { |
| mtx_lock(&sema->mutex); |
| sema->counter++; |
| cnd_signal(&sema->cond); |
| mtx_unlock(&sema->mutex); |
| } |
| |
| /** Wait for semaphore counter to be greater than zero */ |
| static inline void |
| pipe_semaphore_wait(pipe_semaphore *sema) |
| { |
| mtx_lock(&sema->mutex); |
| while (sema->counter <= 0) { |
| cnd_wait(&sema->cond, &sema->mutex); |
| } |
| sema->counter--; |
| mtx_unlock(&sema->mutex); |
| } |
| |
| #endif /* OS_THREAD_H_ */ |