107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
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#ifndef OSMIUM_THREAD_CHECKED_TASK_HPP
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#define OSMIUM_THREAD_CHECKED_TASK_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013,2014 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <chrono>
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#include <future>
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#include <thread>
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#include <utility>
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namespace osmium {
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namespace thread {
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template <class T>
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class CheckedTask {
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std::thread m_thread;
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std::future<bool> m_future;
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public:
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template <class... TArgs>
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explicit CheckedTask(TArgs&&... args) {
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std::packaged_task<bool()> pack_task(T(std::forward<TArgs>(args)...));
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m_future = pack_task.get_future();
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m_thread = std::thread(std::move(pack_task));
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}
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~CheckedTask() {
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// Make sure task is done.
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if (m_thread.joinable()) {
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m_thread.join();
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}
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}
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CheckedTask(const CheckedTask&) = delete;
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CheckedTask& operator=(const CheckedTask&) = delete;
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/**
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* Check task for exceptions.
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*
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* If an exception happened in the task, re-throw it in this
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* thread. This will not do anything if there was no exception.
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*/
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void check_for_exception() {
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if (m_future.valid() && m_future.wait_for(std::chrono::seconds(0)) == std::future_status::ready) {
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m_future.get();
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}
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}
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/**
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* Close the task. This will raise in this thread any exception the
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* task generated in the other thread.
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*/
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void close() {
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// If an exception happened in the task, re-throw
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// it in this thread. This will block if the task
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// isn't finished.
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if (m_future.valid()) {
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m_future.get();
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}
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// Make sure task is done.
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if (m_thread.joinable()) {
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m_thread.join();
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}
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}
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}; // class CheckedTask
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} // namespace thread
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} // namespace osmium
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#endif // OSMIUM_THREAD_CHECKED_TASK_HPP
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