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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQMLTHREAD_P_H
#define QQMLTHREAD_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#include <private/qintrusivelist_p.h>
QT_BEGIN_NAMESPACE
class QThread;
class QMutex;
class QQmlThreadPrivate;
class QQmlThread
{
public:
QQmlThread();
virtual ~QQmlThread();
void startup();
void shutdown();
bool isShutdown() const;
QMutex &mutex();
void lock();
void unlock();
void wakeOne();
void wait();
QThread *thread() const;
bool isThisThread() const;
// Synchronously invoke a method in the thread
template<typename Method, typename ...Args>
void callMethodInThread(Method &&method, Args &&...args);
// Synchronously invoke a method in the main thread. If the main thread is
// blocked in a callMethodInThread() call, the call is made from within that
// call.
template<typename Method, typename ...Args>
void callMethodInMain(Method &&method, Args &&...args);
// Asynchronously invoke a method in the thread.
template<typename Method, typename ...Args>
void postMethodToThread(Method &&method, Args &&...args);
// Asynchronously invoke a method in the main thread.
template<typename Method, typename ...Args>
void postMethodToMain(Method &&method, Args &&...args);
void waitForNextMessage();
void discardMessages();
private:
friend class QQmlThreadPrivate;
struct Message {
Message() : next(nullptr) {}
virtual ~Message() {}
Message *next;
virtual void call(QQmlThread *) = 0;
};
template<typename Method, typename ...Args>
Message *createMessageFromMethod(Method &&method, Args &&...args);
void internalCallMethodInThread(Message *);
void internalCallMethodInMain(Message *);
void internalPostMethodToThread(Message *);
void internalPostMethodToMain(Message *);
QQmlThreadPrivate *d;
};
namespace QtPrivate {
template <typename> struct member_function_traits;
template <typename Return, typename Object, typename... Args>
struct member_function_traits<Return (Object::*)(Args...)>
{
using class_type = Object;
};
}
template<typename Method, typename ...Args>
QQmlThread::Message *QQmlThread::createMessageFromMethod(Method &&method, Args &&...args)
{
struct I : public Message {
Method m;
std::tuple<std::decay_t<Args>...> arguments;
I(Method &&method, Args&& ...args) : m(std::forward<Method>(method)), arguments(std::forward<Args>(args)...) {}
void call(QQmlThread *thread) override {
using class_type = typename QtPrivate::member_function_traits<Method>::class_type;
class_type *me = static_cast<class_type *>(thread);
std::apply(m, std::tuple_cat(std::make_tuple(me), arguments));
}
};
return new I(std::forward<Method>(method), std::forward<Args>(args)...);
}
template<typename Method, typename ...Args>
void QQmlThread::callMethodInMain(Method &&method, Args&& ...args)
{
Message *m = createMessageFromMethod(std::forward<Method>(method), std::forward<Args>(args)...);
internalCallMethodInMain(m);
}
template<typename Method, typename ...Args>
void QQmlThread::callMethodInThread(Method &&method, Args&& ...args)
{
Message *m = createMessageFromMethod(std::forward<Method>(method), std::forward<Args>(args)...);
internalCallMethodInThread(m);
}
template<typename Method, typename ...Args>
void QQmlThread::postMethodToThread(Method &&method, Args&& ...args)
{
Message *m = createMessageFromMethod(std::forward<Method>(method), std::forward<Args>(args)...);
internalPostMethodToThread(m);
}
template<typename Method, typename ...Args>
void QQmlThread::postMethodToMain(Method &&method, Args&& ...args)
{
Message *m = createMessageFromMethod(std::forward<Method>(method), std::forward<Args>(args)...);
internalPostMethodToMain(m);
}
QT_END_NAMESPACE
#endif // QQMLTHREAD_P_H
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