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         volatile void *volatile *p;
   8         volatile void *volatile *prev;
   9         volatile void *volatile *next;
  10         pthread_mutex_t *m;
  11
  12         prev = &self->robust_list.head;
  13         for (p=self->robust_list.head; p&&p!=&self->robust_list.head; p=next) {
  14                 next = *p;
  15                 m = (void *)((char *)p - offsetof(pthread_mutex_t, _m_next));
  16                 if (!(m->_m_type & 128)) {
  17                         int waiters = m->_m_waiters;
  18                         *prev = next;
  19                         int cont = a_swap(&m->_m_lock, self->tid|0x40000000);
  20                         if (cont < 0 || waiters) __wake(&m->_m_lock, 1, 1);
  21                 } else {
  22                         prev = p;
  23                 }
  24         }
  25 }
  26
  27 int pthread_mutexattr_setrobust(pthread_mutexattr_t *a, int robust)
  28 {
  29         if (robust > 1U) return EINVAL;
  30         a->__attr &= ~4;
  31         a->__attr |= robust*4;
  32         return 0;
  33 }