1 #include "pthread_impl.h" 2 #include <threads.h> 3 mtx_lock(mtx_t * m)4int mtx_lock(mtx_t *m) 5 { 6 if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_cas(&m->_m_lock, 0, EBUSY)) 7 return thrd_success; 8 /* Calling mtx_timedlock with a null pointer is an extension. 9 * It is convenient, here to avoid duplication of the logic 10 * for return values. */ 11 return mtx_timedlock(m, 0); 12 } 13