int pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock, const struct timespec *abs_timeout)
{
int thread_id, ret = 0;
if (rwlock == NULL)
return EINVAL;
pthread_mutex_lock(&rwlock->lock);
thread_id = __get_thread_id();
if (__unlikely(!read_precondition(rwlock, thread_id))) {
rwlock->pendingReaders += 1;
do {
ret = pthread_cond_timedwait(&rwlock->cond, &rwlock->lock, abs_timeout);
} while (ret == 0 && !read_precondition(rwlock, thread_id));
rwlock->pendingReaders -= 1;
if (ret != 0)
goto EXIT;
}
rwlock->numLocks ++;
EXIT:
pthread_mutex_unlock(&rwlock->lock);
return ret;
}
static int __pthread_rwlock_timedrdlock(pthread_rwlock_t* rwlock, const timespec* abs_timeout) {
int ret = 0;
if (rwlock == NULL) {
return EINVAL;
}
pthread_mutex_lock(&rwlock->lock);
int tid = __get_thread()->tid;
if (__predict_false(!read_precondition(rwlock, tid))) {
rwlock->pendingReaders += 1;
do {
ret = pthread_cond_timedwait(&rwlock->cond, &rwlock->lock, abs_timeout);
} while (ret == 0 && !read_precondition(rwlock, tid));
rwlock->pendingReaders -= 1;
if (ret != 0) {
goto EXIT;
}
}
++rwlock->numLocks;
EXIT:
pthread_mutex_unlock(&rwlock->lock);
return ret;
}
int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock)
{
int ret = 0;
if (rwlock == NULL)
return EINVAL;
pthread_mutex_lock(&rwlock->lock);
if (__predict_false(!read_precondition(rwlock, __get_thread()->tid)))
ret = EBUSY;
else
++rwlock->numLocks;
pthread_mutex_unlock(&rwlock->lock);
return ret;
}
int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock)
{
int ret = 0;
if (rwlock == NULL)
return EINVAL;
pthread_mutex_lock(&rwlock->lock);
if (__unlikely(!read_precondition(rwlock, __get_thread_id())))
ret = EBUSY;
else
rwlock->numLocks ++;
pthread_mutex_unlock(&rwlock->lock);
return ret;
}
