69     int errorcode = pthread_mutexattr_init(&attr);  in MutexImpl()  local
70     assert(errorcode == 0);  in MutexImpl()
75     errorcode = pthread_mutexattr_settype(&attr, kind);  in MutexImpl()
76     assert(errorcode == 0);  in MutexImpl()
80     errorcode = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);  in MutexImpl()
81     assert(errorcode == 0);  in MutexImpl()
85     errorcode = pthread_mutex_init(mutex, &attr);  in MutexImpl()
86     assert(errorcode == 0);  in MutexImpl()
89     errorcode = pthread_mutexattr_destroy(&attr);  in MutexImpl()
90     assert(errorcode == 0);  in MutexImpl()
117     int errorcode = pthread_mutex_lock(mutex);  in acquire()  local
118     return errorcode == 0;  in acquire()
130     int errorcode = pthread_mutex_unlock(mutex);  in release()  local
131     return errorcode == 0;  in release()
143     int errorcode = pthread_mutex_trylock(mutex);  in tryacquire()  local
144     return errorcode == 0;  in tryacquire()