48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*
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* Copyright (C) 2019 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS 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 3 of the License, or
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* (at your option) any later version.
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*
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* LMS 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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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <functional>
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#include <thread>
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#include <boost/asio/io_context.hpp>
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template <typename It, typename Func>
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void parallel_foreach(std::size_t nbWorkers, It begin, It end, Func&& func)
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{
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if (nbWorkers == 0)
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throw std::runtime_error("Invalid worker count");
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boost::asio::io_context ioContext;
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for (It it {begin}; it != end; ++it)
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{
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auto refValue {std::ref<typename It::value_type>(*it)};
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ioContext.post([refValue, &func]() { std::cout << "EXEC FROM WORKER" << std::endl; func(refValue); std::cout << "END EXEC FROM WORKER" << std::endl; });
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}
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std::vector<std::thread> threads;
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for (std::size_t i {}; i < nbWorkers - 1; ++i)
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threads.emplace_back([&]() { ioContext.run(); });
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ioContext.run();
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for (std::thread& t : threads)
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t.join();
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}
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