Recursive lock Ruby

thread_pthread.c

/**
 * Line 227
 */
static void
native_mutex_initialize(pthread_mutex_t *lock)
{
        /*
	 * Creating mutex attribute with Mutex Recursive
	 * option, to allow self lock.
	 */
    pthread_mutexattr_t attribute;
    pthread_mutexattr_init(&attribute);
    pthread_mutexattr_settype(&attribute, PTHREAD_MUTEX_RECURSIVE);
    int r = pthread_mutex_init(lock, &attribute);
    mutex_debug("init", lock);
    if (r != 0) {
	rb_bug_errno("pthread_mutex_init", r);
    }
}