124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
/* This file is part of Strawberry.
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Copyright 2012, David Sansome <me@davidsansome.com>
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Strawberry 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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Strawberry 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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You should have received a copy of the GNU General Public License
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along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CONCURRENTRUN_H
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#define CONCURRENTRUN_H
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#include <functional>
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#include <QFuture>
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#include <QRunnable>
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#include <QThreadPool>
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/*
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The aim of ThreadFunctor classes and ConcurrentRun::Run() functions is to
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complete QtConcurrentRun, which lack support for using a particular
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QThreadPool, as it always uses QThreadPool::globalInstance().
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This is problematic when we do not want to share the same thread pool over
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all the application, but want to keep the convenient QtConcurrent::run()
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functor syntax.
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With ConcurrentRun::Run(), time critical changes can be performed in their
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own pool, which is not empty by other actions (as it happens when using
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QtConcurrentRun::run()).
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ThreadFunctor classes are used to store a functor and its arguments, and
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Run() functions are used for convenience: to directly create a new
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ThreadFunctor object and start it.
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*/
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/*
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Base abstract classes ThreadFunctorBase and ThreadFunctor (for void and
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non-void result):
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*/
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template<typename ReturnType>
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class ThreadFunctorBase : public QFutureInterface<ReturnType>, public QRunnable {
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public:
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ThreadFunctorBase() {}
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QFuture<ReturnType> Start(QThreadPool* thread_pool) {
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this->setRunnable(this);
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this->reportStarted();
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Q_ASSERT(thread_pool);
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QFuture<ReturnType> future = this->future();
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thread_pool->start(this, 0 /* priority: currently we do not support changing the priority. Might be added later if needed */);
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return future;
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}
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virtual void run() = 0;
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};
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template <typename ReturnType, typename... Args>
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class ThreadFunctor : public ThreadFunctorBase<ReturnType> {
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public:
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ThreadFunctor(std::function<ReturnType (Args...)> function, Args... args)
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: function_(std::bind(function, args...)) {
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}
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virtual void run() {
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this->reportResult(function_());
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this->reportFinished();
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}
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private:
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std::function<ReturnType()> function_;
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};
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// Partial specialisation for void return type.
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template <typename... Args>
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class ThreadFunctor <void, Args...> : public ThreadFunctorBase<void> {
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public:
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ThreadFunctor(std::function<void (Args...)> function, Args... args)
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: function_(std::bind(function, args...)) {
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}
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virtual void run() {
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function_();
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this->reportFinished();
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}
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private:
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std::function<void()> function_;
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};
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/*
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Run functions
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*/
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namespace ConcurrentRun {
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// Empty argument form.
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template <typename ReturnType>
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QFuture<ReturnType> Run(QThreadPool* threadpool, std::function<ReturnType ()> function) {
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return (new ThreadFunctor<ReturnType>(function))->Start(threadpool);
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}
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// Function object with arguments form.
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template <typename ReturnType, typename... Args>
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QFuture<ReturnType> Run(QThreadPool* threadpool, std::function<ReturnType (Args...)> function, const Args&... args) {
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return (new ThreadFunctor<ReturnType, Args...>(function, args...))->Start(threadpool);
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}
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// Support passing C function pointers instead of function objects.
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template <typename ReturnType, typename... Args>
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QFuture<ReturnType> Run(QThreadPool* threadpool, ReturnType (*function) (Args...), const Args&... args) {
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return Run(threadpool, std::function<ReturnType (Args...)>(function), args...);
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}
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}
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#endif // CONCURRENTRUN_H
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