1 #include "pthread_impl.h"
3 int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
6 int type = m->_m_type & 15;
7 pthread_t self = __pthread_self();
10 if (!self->robust_list.off) {
11 __syscall(SYS_set_robust_list, &self->robust_list, 3*sizeof(long));
12 self->robust_list.head = &self->robust_list.head;
13 self->robust_list.off = (char*)&m->_m_lock-(char *)&m->_m_next;
17 own = old & 0x7fffffff;
18 if (own == tid && (type&3) == PTHREAD_MUTEX_RECURSIVE) {
19 if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
23 if (own == 0x40000000) return ENOTRECOVERABLE;
25 if (m->_m_type & 128) {
26 if (m->_m_waiters) tid |= 0x80000000;
27 self->robust_list.pending = &m->_m_next;
30 if ((own && (!(own & 0x40000000) || !(type & 4)))
31 || a_cas(&m->_m_lock, old, tid) != old) {
32 self->robust_list.pending = 0;
36 volatile void *next = self->robust_list.head;
38 m->_m_prev = &self->robust_list.head;
39 if (next != &self->robust_list.head) *(volatile void *volatile *)
40 ((char *)next - sizeof(void *)) = &m->_m_next;
41 self->robust_list.head = &m->_m_next;
42 self->robust_list.pending = 0;
53 int __pthread_mutex_trylock(pthread_mutex_t *m)
55 if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL)
56 return a_cas(&m->_m_lock, 0, EBUSY) & EBUSY;
57 return __pthread_mutex_trylock_owner(m);
60 weak_alias(__pthread_mutex_trylock, pthread_mutex_trylock);