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();
11 if (!self->robust_list.off)
12 __syscall(SYS_set_robust_list,
13 &self->robust_list, 3*sizeof(long));
14 self->robust_list.off = (char*)&m->_m_lock-(char *)&m->_m_next;
15 self->robust_list.pending = &m->_m_next;
19 own = old & 0x7fffffff;
20 if (own == tid && (type&3) == PTHREAD_MUTEX_RECURSIVE) {
21 if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
26 if ((own && !(own & 0x40000000)) || a_cas(&m->_m_lock, old, tid)!=old)
29 if (type < 4) return 0;
33 return ENOTRECOVERABLE;
35 m->_m_next = self->robust_list.head;
36 m->_m_prev = &self->robust_list.head;
37 if (self->robust_list.head)
38 self->robust_list.head[-1] = &m->_m_next;
39 self->robust_list.head = &m->_m_next;
40 self->robust_list.pending = 0;
50 int pthread_mutex_trylock(pthread_mutex_t *m)
52 if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL)
53 return a_cas(&m->_m_lock, 0, EBUSY) & EBUSY;
54 return __pthread_mutex_trylock_owner(m);