211     while (worker->status_ == OK) {   // wait in idling mode  in ThreadLoop()
214     if (worker->status_ == WORK) {  in ThreadLoop()
216       worker->status_ = OK;  in ThreadLoop()
217     } else if (worker->status_ == NOT_OK) {   // finish the worker  in ThreadLoop()
235   if (worker->status_ >= OK) {  in ChangeState()
237     while (worker->status_ != OK) {  in ChangeState()
242       worker->status_ = new_status;  in ChangeState()
255   worker->status_ = NOT_OK;  in Init()
262   assert(worker->status_ <= OK);  in Sync()
269   if (worker->status_ < OK) {  in Reset()
284     if (ok) worker->status_ = OK;  in Reset()
295     worker->status_ = OK;  in Reset()
297   } else if (worker->status_ > OK) {  in Reset()
300   assert(!ok || (worker->status_ == OK));  in Reset()
329   worker->status_ = NOT_OK;  in End()
332   assert(worker->status_ == NOT_OK);  in End()