mirror of https://gitee.com/bigwinds/arangodb
101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#include "ThreadPool.h"
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#include "Basics/WorkerThread.h"
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using namespace arangodb::basics;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create a pool with the specified size of worker threads
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////////////////////////////////////////////////////////////////////////////////
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ThreadPool::ThreadPool(size_t size, std::string const& name)
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: _condition(), _threads(), _tasks(), _name(name), _stopping(false) {
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_threads.reserve(size);
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for (size_t i = 0; i < size; ++i) {
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auto workerThread = new WorkerThread(this);
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try {
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_threads.emplace_back(workerThread);
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} catch (...) {
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// clean up
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delete workerThread;
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for (auto& it : _threads) {
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delete it;
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}
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_threads.clear();
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throw;
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}
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}
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// now start them all
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for (auto& it : _threads) {
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it->start();
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the pool
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////////////////////////////////////////////////////////////////////////////////
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ThreadPool::~ThreadPool() {
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_stopping = true;
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_condition.broadcast();
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for (auto* it : _threads) {
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it->waitForDone();
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}
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for (auto* it : _threads) {
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delete it;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief dequeue a task
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////////////////////////////////////////////////////////////////////////////////
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bool ThreadPool::dequeue(std::function<void()>& result) {
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while (!_stopping) {
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CONDITION_LOCKER(guard, _condition);
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if (_tasks.empty()) {
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guard.wait(1000000);
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}
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if (_stopping) {
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break;
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}
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if (!_tasks.empty()) {
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result = _tasks.front();
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_tasks.pop_front();
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return true;
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}
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}
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return false;
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}
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