diff options
Diffstat (limited to 'src/thread/pthread_cond_broadcast.c')
| -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 bf6de048..9c6a462b 100644 --- a/src/thread/pthread_cond_broadcast.c +++ b/src/thread/pthread_cond_broadcast.c @@ -22,8 +22,12 @@ int pthread_cond_broadcast(pthread_cond_t *c) m = c->_c_mutex; /* Move waiter count to the mutex */ - a_fetch_add(&m->_m_waiters, c->_c_waiters); - a_store(&c->_c_waiters, 0); + for (;;) { + int w = c->_c_waiters2; + a_fetch_add(&m->_m_waiters, w); + if (a_cas(&c->_c_waiters2, 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. */ |