diff options
| -rw-r--r-- | src/thread/pthread_cond_broadcast.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/thread/pthread_cond_broadcast.c b/src/thread/pthread_cond_broadcast.c index 4fab9994..7e5ea91c 100644 --- a/src/thread/pthread_cond_broadcast.c +++ b/src/thread/pthread_cond_broadcast.c @@ -30,8 +30,12 @@ int pthread_cond_broadcast(pthread_cond_t *c) } /* Move waiter count to the mutex */ - w = a_swap(&c->_c_waiters, 0); - a_fetch_add(&m->_m_waiters, w); + for (;;) { + w = c->_c_waiters; + a_fetch_add(&m->_m_waiters, w); + if (a_cas(&c->_c_waiters, w, 0) == w) break; + a_fetch_add(&m->_m_waiters, -w); + } /* Perform the futex requeue, waking one waiter unless we know * that the calling thread holds the mutex. */ |