53   int errorcode = pthread_mutexattr_init(&attr);  in MutexImpl()  local
54   assert(errorcode == 0); (void)errorcode;  in MutexImpl()
59   errorcode = pthread_mutexattr_settype(&attr, kind);  in MutexImpl()
60   assert(errorcode == 0);  in MutexImpl()
65   errorcode = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);  in MutexImpl()
66   assert(errorcode == 0);  in MutexImpl()
70   errorcode = pthread_mutex_init(mutex, &attr);  in MutexImpl()
71   assert(errorcode == 0);  in MutexImpl()
74   errorcode = pthread_mutexattr_destroy(&attr);  in MutexImpl()
75   assert(errorcode == 0);  in MutexImpl()
96   int errorcode = pthread_mutex_lock(mutex);  in acquire()  local
97   return errorcode == 0;  in acquire()
106   int errorcode = pthread_mutex_unlock(mutex);  in release()  local
107   return errorcode == 0;  in release()
116   int errorcode = pthread_mutex_trylock(mutex);  in tryacquire()  local
117   return errorcode == 0;  in tryacquire()