Method Cancel

library/cpp/par/par_exec.h:655–662

        };

        void Cancel() {
            if (AtomicCas(&IsCanceledFlag, (void*)this, (void*)nullptr)) {
                PAR_DEBUG_LOG << "SplitMRExec canceled" << Endl;
                if (CompleteNotify.Get())
                    CompleteNotify->MRCommandComplete(true, nullptr);
                CompleteNotify = nullptr;
            }
        }
        void StartNextBlock() {
            IUserContext::EDataDistrState ds = UserContext->UpdateDataDistrState(nullptr);
            if (ds == IUserContext::DATA_UNAVAILABLE) {