nsz Git - musl/blob - src/thread/pthread_mutexattr_setrobust.c

   1 #include "pthread_impl.h"
   2 #include <stddef.h>
   3
   4 void __do_private_robust_list()
   5 {
   6         pthread_t self = __pthread_self();
   7         void **p, **prev, **next;
   8         pthread_mutex_t *m;
   9
  10         for (prev=0, p=self->robust_list.head; p; p=next) {
  11                 next = *p;
  12                 m = (void *)((char *)p - offsetof(pthread_mutex_t, _m_next));
  13                 if (!(m->_m_type & 128)) {
  14                         int waiters = m->_m_waiters;
  15                         if (prev) *prev = next;
  16                         else self->robust_list.head = next;
  17                         int cont = a_swap(&m->_m_lock, self->tid|0x40000000);
  18                         if (cont < 0 || waiters) __wake(&m->_m_lock, 1, 1);
  19                 } else {
  20                         prev = p;
  21                 }
  22         }
  23 }
  24
  25 int pthread_mutexattr_setrobust(pthread_mutexattr_t *a, int robust)
  26 {
  27         if (robust > 1U) return EINVAL;
  28         a->__attr &= ~4;
  29         a->__attr |= robust*4;
  30         return 0;
  31 }