libc-top-half/musl/src/thread/mtx_lock.c

   1 #include "pthread_impl.h"
   2 #include <threads.h>
   3
   4 int 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 }