38 pthread_mutex_t mutex;  variable
46   int ret = pthread_mutex_trylock (&mutex);  in cleanup()
52   if (pthread_mutex_unlock (&mutex))  in cleanup()
64       if ((ret = pthread_mutex_lock (&mutex)) != 0)  in signaller()
76       if ((ret = pthread_mutex_unlock (&mutex)) != 0)  in signaller()
89   if ((ret = pthread_mutex_unlock (&mutex)) != 0)  in signaller()
103       if ((ret = pthread_mutex_lock (&mutex)) != 0)  in waiter()
111       if ((ret = pthread_cond_wait (&cond, &mutex)) != 0)  in waiter()
118       if ((ret = pthread_mutex_unlock (&mutex)) != 0)  in waiter()
132   if ((ret = pthread_mutex_unlock (&mutex)) != 0)  in waiter()
156       if ((ret = pthread_mutex_lock (&mutex)) != 0)  in timed_waiter()
165       if ((ret = pthread_cond_timedwait (&cond, &mutex, &ts)) != 0)  in timed_waiter()
171       if ((ret = pthread_mutex_unlock (&mutex)) != 0)  in timed_waiter()
185   if ((ret = pthread_mutex_unlock (&mutex)) != 0)  in timed_waiter()
220       if ((ret = pthread_mutex_init (&mutex, &attr)) != 0)  in do_test_wait()