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119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/******************************************************************************
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* Copyright (c) 2018, Connor Manning
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of the Martin Isenburg or Iowa Department
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* of Natural Resources nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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****************************************************************************/
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#include "ThreadPool.hpp"
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#include <iostream>
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namespace untwine
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{
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void ThreadPool::go()
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{
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std::lock_guard<std::mutex> lock(m_mutex);
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if (m_running)
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return;
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m_running = true;
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for (std::size_t i(0); i < m_numThreads; ++i)
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{
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m_threads.emplace_back([this]() { work(); });
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}
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}
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void ThreadPool::work()
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{
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while (true)
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{
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std::unique_lock<std::mutex> lock(m_mutex);
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m_consumeCv.wait(lock, [this]()
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{
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return m_tasks.size() || !m_running;
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});
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if (m_tasks.size())
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{
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++m_outstanding;
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auto task(std::move(m_tasks.front()));
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m_tasks.pop();
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lock.unlock();
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// Notify add(), which may be waiting for a spot in the queue.
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m_produceCv.notify_all();
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std::string err;
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if (m_trap)
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{
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try
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{
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task();
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}
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catch (std::exception& e)
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{
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err = e.what();
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}
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catch (...)
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{
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err = m_catchall;
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}
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}
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else
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task();
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lock.lock();
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--m_outstanding;
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if (err.size())
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{
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if (m_verbose)
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std::cout << "Exception in pool task: " << err << std::endl;
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m_errors.push_back(err);
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}
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lock.unlock();
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// Notify await(), which may be waiting for a running task.
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m_produceCv.notify_all();
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}
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else if (!m_running)
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{
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return;
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}
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}
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}
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} // namespace untwine
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