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/**************************************************************************
*
* 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);
}
/*
* Thread-specific data.
*/
typedef struct {
tss_t key;
int initMagic;
} pipe_tsd;
#define PIPE_TSD_INIT_MAGIC 0xff8adc98
static inline void
pipe_tsd_init(pipe_tsd *tsd)
{
if (tss_create(&tsd->key, NULL/*free*/) != 0) {
exit(-1);
}
tsd->initMagic = PIPE_TSD_INIT_MAGIC;
}
static inline void *
pipe_tsd_get(pipe_tsd *tsd)
{
if (tsd->initMagic != (int) PIPE_TSD_INIT_MAGIC) {
pipe_tsd_init(tsd);
}
return tss_get(tsd->key);
}
static inline void
pipe_tsd_set(pipe_tsd *tsd, void *value)
{
if (tsd->initMagic != (int) PIPE_TSD_INIT_MAGIC) {
pipe_tsd_init(tsd);
}
if (tss_set(tsd->key, value) != 0) {
exit(-1);
}
}
/*
* Thread statistics.
*/
/* Return the time of the current thread's CPU time clock. */
static inline int64_t
pipe_current_thread_get_time_nano(void)
{
#if defined(HAVE_PTHREAD)
return u_thread_get_time_nano(pthread_self());
#else
return 0;
#endif
}
#endif /* OS_THREAD_H_ */
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