94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
/**
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* src/util/thread_pool_executor.cc
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*
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* Copyright (c) 2021-2022 Bartek Kryza <bkryza@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "thread_pool_executor.h"
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namespace clanguml::util {
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thread_pool_executor::thread_pool_executor()
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: thread_pool_executor{0}
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{
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}
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thread_pool_executor::thread_pool_executor(unsigned int pool_size)
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: done_{false}
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{
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if (pool_size == 0U)
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pool_size = std::thread::hardware_concurrency();
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for (auto i = 0U; i < pool_size; i++) {
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threads_.push_back(std::thread{&thread_pool_executor::worker, this});
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}
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}
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thread_pool_executor::~thread_pool_executor() { stop(); }
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std::future<void> thread_pool_executor::add(std::function<void()> &&task)
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{
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std::unique_lock<std::mutex> l(tasks_mutex_);
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std::packaged_task<void()> ptask{std::move(task)};
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auto res = ptask.get_future();
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tasks_.emplace_back(std::move(ptask));
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l.unlock();
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tasks_cond_.notify_one();
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return res;
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}
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void thread_pool_executor::stop()
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{
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done_ = true;
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for (auto &thread : threads_) {
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if (thread.joinable())
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thread.join();
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}
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}
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void thread_pool_executor::worker()
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{
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try {
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while (!done_) {
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auto task = get();
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task();
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}
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}
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catch (std::runtime_error &e) {
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}
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}
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std::packaged_task<void()> thread_pool_executor::get()
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{
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std::unique_lock<std::mutex> l(tasks_mutex_);
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while (tasks_.empty()) {
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if (done_)
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throw std::runtime_error("Thread pool closing...");
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tasks_cond_.wait_for(l, std::chrono::seconds(1));
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}
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auto res = std::move(tasks_.front());
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tasks_.pop_front();
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return res;
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}
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}
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