55   int errorcode = pthread_rwlock_init(rwlock, nullptr);  in RWMutexImpl()  local
56   (void)errorcode;  in RWMutexImpl()
57   assert(errorcode == 0);  in RWMutexImpl()
78   int errorcode = pthread_rwlock_rdlock(rwlock);  in lock_shared()  local
79   return errorcode == 0;  in lock_shared()
88   int errorcode = pthread_rwlock_unlock(rwlock);  in unlock_shared()  local
89   return errorcode == 0;  in unlock_shared()
96   int errorcode = pthread_rwlock_tryrdlock(rwlock);  in try_lock_shared()  local
97   return errorcode == 0;  in try_lock_shared()
106   int errorcode = pthread_rwlock_wrlock(rwlock);  in lock()  local
107   return errorcode == 0;  in lock()
116   int errorcode = pthread_rwlock_unlock(rwlock);  in unlock()  local
117   return errorcode == 0;  in unlock()
124   int errorcode = pthread_rwlock_trywrlock(rwlock);  in try_lock()  local
125   return errorcode == 0;  in try_lock()