diff options
Diffstat (limited to 'src/thread/pthread_cond_timedwait.c')
| -rw-r--r-- | src/thread/pthread_cond_timedwait.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/src/thread/pthread_cond_timedwait.c b/src/thread/pthread_cond_timedwait.c index e3dc8147..db2744ba 100644 --- a/src/thread/pthread_cond_timedwait.c +++ b/src/thread/pthread_cond_timedwait.c @@ -7,8 +7,6 @@ struct cm { static void unwait(pthread_cond_t *c, pthread_mutex_t *m) { - int w; - /* Removing a waiter is non-trivial if we could be using requeue * based broadcast signals, due to mutex access issues, etc. */ @@ -20,10 +18,8 @@ static void unwait(pthread_cond_t *c, pthread_mutex_t *m) while (a_swap(&c->_c_lock, 1)) __wait(&c->_c_lock, &c->_c_lockwait, 1, 1); - /* Atomically decrement waiters2 if positive, else mutex waiters. */ - do w = c->_c_waiters2; - while (w && a_cas(&c->_c_waiters2, w, w-1)!=w); - if (!w) a_dec(&m->_m_waiters); + if (c->_c_waiters2) c->_c_waiters2--; + else a_dec(&m->_m_waiters); a_store(&c->_c_lock, 0); if (c->_c_lockwait) __wake(&c->_c_lock, 1, 1); @@ -46,10 +42,16 @@ int pthread_cond_timedwait(pthread_cond_t *c, pthread_mutex_t *m, const struct t pthread_testcancel(); - if (c->_c_mutex != (void *)-1) c->_c_mutex = m; - a_inc(&c->_c_waiters); - a_inc(&c->_c_waiters2); + + if (c->_c_mutex != (void *)-1) { + c->_c_mutex = m; + while (a_swap(&c->_c_lock, 1)) + __wait(&c->_c_lock, &c->_c_lockwait, 1, 1); + c->_c_waiters2++; + a_store(&c->_c_lock, 0); + if (c->_c_lockwait) __wake(&c->_c_lock, 1, 1); + } seq = c->_c_seq; |