make sem_wait and sem_timedwait interruptible by signals

[musl] / src / thread / pthread_mutex_trylock.c

diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c
index e851517..783ca0c 100644 (file)
--- a/src/thread/pthread_mutex_trylock.c
+++ b/src/thread/pthread_mutex_trylock.c
@@ -7,12 +7,6 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
        pthread_t self = __pthread_self();
        int tid = self->tid;
 
-       if (!self->robust_list.off) {
-               __syscall(SYS_set_robust_list, &self->robust_list, 3*sizeof(long));
-               self->robust_list.head = &self->robust_list.head;
-               self->robust_list.off = (char*)&m->_m_lock-(char *)&m->_m_next;
-       }
-
        old = m->_m_lock;
        own = old & 0x7fffffff;
        if (own == tid && (type&3) == PTHREAD_MUTEX_RECURSIVE) {
@@ -20,15 +14,19 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
                m->_m_count++;
                return 0;
        }
-       if (own == 0x40000000) return ENOTRECOVERABLE;
+       if (own == 0x7fffffff) return ENOTRECOVERABLE;
+       if (own && (!(own & 0x40000000) || !(type & 4))) return EBUSY;
 
        if (m->_m_type & 128) {
+               if (!self->robust_list.off) {
+                       self->robust_list.off = (char*)&m->_m_lock-(char *)&m->_m_next;
+                       __syscall(SYS_set_robust_list, &self->robust_list, 3*sizeof(long));
+               }
                if (m->_m_waiters) tid |= 0x80000000;
                self->robust_list.pending = &m->_m_next;
        }
 
-       if ((own && (!(own & 0x40000000) || !(type & 4)))
-           || a_cas(&m->_m_lock, old, tid) != old) {
+       if (a_cas(&m->_m_lock, old, tid) != old) {
                self->robust_list.pending = 0;
                return EBUSY;
        }
@@ -50,9 +48,11 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
        return 0;
 }
 
-int pthread_mutex_trylock(pthread_mutex_t *m)
+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);
 }
+
+weak_alias(__pthread_mutex_trylock, pthread_mutex_trylock);