Function pthread_mutex_trylock

components/libc/posix/pthreads/pthread_mutex.c:513–541

* @brief Attempts to lock a mutex without blocking. * * This function attempts to lock the mutex object pointed to by `mutex`. If the mutex * is already locked by another thread, the function returns immediately with an error * code instead of blocking. * * @param[in,out] mutex Pointer to the mutex to be locked. * * @return * - 0 on success (the mutex was successfully locked). * - Non-ze

 * @see pthread_mutex_lock, pthread_mutex_unlock, pthread_mutex_init
 */
int pthread_mutex_trylock(pthread_mutex_t *mutex)
{
    rt_err_t result;
    int mtype;

    if (!mutex)
        return EINVAL;
    if (mutex->attr == -1)
    {
        /* init mutex */
        pthread_mutex_init(mutex, RT_NULL);
    }

    mtype = mutex->attr & MUTEXATTR_TYPE_MASK;
    rt_enter_critical();
    if (mutex->lock.owner == rt_thread_self() &&
        mtype != PTHREAD_MUTEX_RECURSIVE)
    {
        rt_exit_critical();

        return EDEADLK;
    }
    rt_exit_critical();

    result = rt_mutex_take(&(mutex->lock), 0);
    if (result == RT_EOK) return 0;

    return EBUSY;
}
RTM_EXPORT(pthread_mutex_trylock);

int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *attr, int *prioceiling)