dolphin/Source/Core/DolphinQt2/QtUtils/RunOnObject.h

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2017-07-26 03:46:35 +00:00
// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#pragma once
#include <QThread>
2017-07-26 03:46:35 +00:00
#include <type_traits>
#include <utility>
#include "Common/Event.h"
#include "DolphinQt2/QtUtils/QueueOnObject.h"
class QObject;
// QWidget and subclasses are not thread-safe! This helper takes arbitrary code from any thread,
// safely runs it on the appropriate GUI thread, waits for it to finish, and returns the result.
template <typename F>
auto RunOnObject(QObject* object, F&& functor)
{
// If we queue up a functor on the current thread, it won't run until we return to the event loop,
// which means waiting for it to finish will never complete. Instead, run it immediately.
if (object->thread() == QThread::currentThread())
return functor();
Common::Event event;
std::result_of_t<F()> result;
QueueOnObject(object, [&event, &result, functor = std::forward<F>(functor) ] {
result = functor();
event.Set();
});
event.Wait();
return result;
}