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https://github.com/OPM/opm-simulators.git
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101 lines
3.0 KiB
C++
101 lines
3.0 KiB
C++
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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*
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* \brief This file serves as an example of how to use the tasklet mechanism for
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* asynchronous work.
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*/
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#include "config.h"
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#include <opm/models/parallel/tasklets.hh>
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#include <chrono>
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#include <iostream>
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std::mutex outputMutex;
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// The runner is created on the heap for the assertion and outputs in the run function of the tasklets.
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std::unique_ptr<Opm::TaskletRunner> runner{};
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class SleepTasklet : public Opm::TaskletInterface
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{
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public:
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SleepTasklet(int mseconds)
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: mseconds_(mseconds)
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{
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n_ = numInstantiated_;
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++ numInstantiated_;
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}
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void run()
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{
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assert(0 <= runner->workerThreadIndex() && runner->workerThreadIndex() < runner->numWorkerThreads());
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std::this_thread::sleep_for(std::chrono::milliseconds(mseconds_));
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std::lock_guard<std::mutex> guard(outputMutex);
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std::cout << "Sleep tasklet " << n_ << " of " << mseconds_ << " ms completed by worker thread " << runner->workerThreadIndex() << std::endl;
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}
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private:
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static int numInstantiated_;
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int n_;
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int mseconds_;
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};
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void sleepAndPrintFunction();
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void sleepAndPrintFunction()
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{
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int ms = 100;
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std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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std::lock_guard<std::mutex> guard(outputMutex);
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std::cout << "Sleep completed by worker thread " << runner->workerThreadIndex() << std::endl;
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}
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int SleepTasklet::numInstantiated_ = 0;
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int main()
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{
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int numWorkers = 2;
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runner = std::make_unique<Opm::TaskletRunner>(numWorkers);
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// the master thread is not a worker thread
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assert(runner->workerThreadIndex() < 0);
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assert(runner->numWorkerThreads() == numWorkers);
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for (int i = 0; i < 5; ++ i) {
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//auto st = std::make_shared<SleepTasklet>((i + 1)*1000);
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auto st = std::make_shared<SleepTasklet>(100);
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runner->dispatch(st);
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}
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std::cout << "before barrier" << std::endl;
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runner->barrier();
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std::cout << "after barrier" << std::endl;
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runner->dispatchFunction(sleepAndPrintFunction);
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runner->dispatchFunction(sleepAndPrintFunction, /*numInvokations=*/6);
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return 0;
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}
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