#include "pthread_impl.h"
-int pthread_mutex_trylock(pthread_mutex_t *m)
+int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
{
- int tid;
- int own;
- pthread_t self;
-
- if (m->_m_type == PTHREAD_MUTEX_NORMAL)
- return a_swap(&m->_m_lock, EBUSY);
+ int old, own;
+ int type = m->_m_type & 15;
+ pthread_t self = __pthread_self();
+ int tid = self->tid;
- self = pthread_self();
- tid = self->tid | 0x80000000;
-
- if (m->_m_type >= 4) {
+ if (type >= 4) {
if (!self->robust_list.off)
__syscall(SYS_set_robust_list,
&self->robust_list, 3*sizeof(long));
self->robust_list.pending = &m->_m_next;
}
- if (m->_m_lock == tid && (m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE) {
+ old = m->_m_lock;
+ own = old & 0x7fffffff;
+ if (own == tid && (type&3) == PTHREAD_MUTEX_RECURSIVE) {
if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
m->_m_count++;
return 0;
}
- own = m->_m_lock;
- if ((own && !(own & 0x40000000)) || a_cas(&m->_m_lock, own, tid)!=own)
+ if ((own && !(own & 0x40000000)) || a_cas(&m->_m_lock, old, tid)!=old)
return EBUSY;
- m->_m_count = 1;
-
- if (m->_m_type < 4) return 0;
+ if (type < 4) return 0;
- if (m->_m_type >= 8) {
+ if (type >= 8) {
m->_m_lock = 0;
return ENOTRECOVERABLE;
}
self->robust_list.head = &m->_m_next;
self->robust_list.pending = 0;
if (own) {
+ m->_m_count = 0;
m->_m_type += 8;
return EOWNERDEAD;
}
return 0;
}
+
+int pthread_mutex_trylock(pthread_mutex_t *m)
+{
+ if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL)
+ return a_cas(&m->_m_lock, 0, EBUSY) & EBUSY;
+ return __pthread_mutex_trylock_owner(m);
+}