mtx_trylock.c\thread\src - musl - musl - an implementation of the standard library for Linux-based systems

#include "pthread_impl.h"
#include <threads.h>
int mtx_trylock(mtx_t *m)
{
	if (m->_m_type == PTHREAD_MUTEX_NORMAL)
		return (a_cas(&m->_m_lock, 0, EBUSY) & EBUSY) ? thrd_busy : thrd_success;
	int ret = __pthread_mutex_trylock((pthread_mutex_t *)m);
	switch (ret) {
	default: return thrd_error;
	case 0: return thrd_success;
	case EBUSY: return thrd_busy;
	}
}