diff options
Diffstat (limited to 'src/thread')
| -rw-r--r-- | src/thread/pthread_mutex_trylock.c | 8 | ||||
| -rw-r--r-- | src/thread/pthread_mutex_unlock.c | 7 | ||||
| -rw-r--r-- | src/thread/pthread_mutexattr_setrobust.c | 10 |
3 files changed, 16 insertions, 9 deletions
diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c index 8d256614..31587e1f 100644 --- a/src/thread/pthread_mutex_trylock.c +++ b/src/thread/pthread_mutex_trylock.c @@ -9,6 +9,7 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m) 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; } @@ -29,10 +30,11 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m) return EBUSY; } - m->_m_next = self->robust_list.head; + volatile void *next = self->robust_list.head; + m->_m_next = next; m->_m_prev = &self->robust_list.head; - if (self->robust_list.head) - self->robust_list.head[-1] = &m->_m_next; + if (next != &self->robust_list.head) *(volatile void *volatile *) + ((char *)next - sizeof(void *)) = &m->_m_next; self->robust_list.head = &m->_m_next; self->robust_list.pending = 0; diff --git a/src/thread/pthread_mutex_unlock.c b/src/thread/pthread_mutex_unlock.c index 42837516..46761d9a 100644 --- a/src/thread/pthread_mutex_unlock.c +++ b/src/thread/pthread_mutex_unlock.c @@ -21,8 +21,11 @@ int pthread_mutex_unlock(pthread_mutex_t *m) self->robust_list.pending = &m->_m_next; __vm_lock_impl(+1); } - *(void **)m->_m_prev = m->_m_next; - if (m->_m_next) ((void **)m->_m_next)[-1] = m->_m_prev; + volatile void *prev = m->_m_prev; + volatile void *next = m->_m_next; + *(volatile void *volatile *)prev = next; + if (next != &self->robust_list.head) *(volatile void *volatile *) + ((char *)next - sizeof(void *)) = prev; } cont = a_swap(&m->_m_lock, (type & 8) ? 0x40000000 : 0); if (type != PTHREAD_MUTEX_NORMAL && !priv) { diff --git a/src/thread/pthread_mutexattr_setrobust.c b/src/thread/pthread_mutexattr_setrobust.c index 8948cbaf..d0627889 100644 --- a/src/thread/pthread_mutexattr_setrobust.c +++ b/src/thread/pthread_mutexattr_setrobust.c @@ -4,16 +4,18 @@ void __do_private_robust_list() { pthread_t self = __pthread_self(); - void **p, **prev, **next; + volatile void *volatile *p; + volatile void *volatile *prev; + volatile void *volatile *next; pthread_mutex_t *m; - for (prev=0, p=self->robust_list.head; p; p=next) { + prev = &self->robust_list.head; + for (p=self->robust_list.head; p&&p!=&self->robust_list.head; p=next) { next = *p; m = (void *)((char *)p - offsetof(pthread_mutex_t, _m_next)); if (!(m->_m_type & 128)) { int waiters = m->_m_waiters; - if (prev) *prev = next; - else self->robust_list.head = next; + *prev = next; int cont = a_swap(&m->_m_lock, self->tid|0x40000000); if (cont < 0 || waiters) __wake(&m->_m_lock, 1, 1); } else { |