33 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;  variable
45   pthread_mutex_lock (&lock);  in thr1()
55   pthread_mutex_unlock (&lock);  in thr1()
91   pthread_mutex_lock (&lock);  in thr2()
102   pthread_mutex_unlock (&lock);  in thr2()
386   pthread_mutex_lock (&lock);  in do_test()
388     pthread_cond_wait (&cond, &lock);  in do_test()
389   pthread_mutex_unlock (&lock);  in do_test()
398   pthread_mutex_lock (&lock);  in do_test()
442   pthread_mutex_unlock (&lock);  in do_test()
544   pthread_mutex_lock (&lock);  in do_test()
546     pthread_cond_wait (&cond, &lock);  in do_test()
547   pthread_mutex_unlock (&lock);  in do_test()
556   pthread_mutex_lock (&lock);  in do_test()
579   pthread_mutex_unlock (&lock);  in do_test()