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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2017 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QTHREAD_H
#define QTHREAD_H
#include <QtCore/qobject.h>
#include <QtCore/qdeadlinetimer.h>
// For QThread::create. The configure-time test just checks for the availability
// of std::future and std::async; for the C++17 codepath we perform some extra
// checks here (for std::invoke and C++14 lambdas).
#if QT_CONFIG(cxx11_future)
# include <future> // for std::async
# include <functional> // for std::invoke; no guard needed as it's a C++98 header
# if defined(__cpp_lib_invoke) && __cpp_lib_invoke >= 201411 \
&& defined(__cpp_init_captures) && __cpp_init_captures >= 201304 \
&& defined(__cpp_generic_lambdas) && __cpp_generic_lambdas >= 201304
# define QTHREAD_HAS_VARIADIC_CREATE
# endif
#endif
QT_BEGIN_NAMESPACE
class QThreadData;
class QThreadPrivate;
class QAbstractEventDispatcher;
class Q_CORE_EXPORT QThread : public QObject
{
Q_OBJECT
public:
static Qt::HANDLE currentThreadId() noexcept Q_DECL_PURE_FUNCTION;
static QThread *currentThread();
static int idealThreadCount() noexcept;
static void yieldCurrentThread();
explicit QThread(QObject *parent = nullptr);
~QThread();
enum Priority {
IdlePriority,
LowestPriority,
LowPriority,
NormalPriority,
HighPriority,
HighestPriority,
TimeCriticalPriority,
InheritPriority
};
void setPriority(Priority priority);
Priority priority() const;
bool isFinished() const;
bool isRunning() const;
void requestInterruption();
bool isInterruptionRequested() const;
void setStackSize(uint stackSize);
uint stackSize() const;
void exit(int retcode = 0);
QAbstractEventDispatcher *eventDispatcher() const;
void setEventDispatcher(QAbstractEventDispatcher *eventDispatcher);
bool event(QEvent *event) override;
int loopLevel() const;
#ifdef Q_CLANG_QDOC
template <typename Function, typename... Args>
static QThread *create(Function &&f, Args &&... args);
template <typename Function>
static QThread *create(Function &&f);
#else
# if QT_CONFIG(cxx11_future)
# ifdef QTHREAD_HAS_VARIADIC_CREATE
template <typename Function, typename... Args>
static QThread *create(Function &&f, Args &&... args);
# else
template <typename Function>
static QThread *create(Function &&f);
# endif // QTHREAD_HAS_VARIADIC_CREATE
# endif // QT_CONFIG(cxx11_future)
#endif // Q_CLANG_QDOC
public Q_SLOTS:
void start(Priority = InheritPriority);
void terminate();
void quit();
public:
bool wait(QDeadlineTimer deadline = QDeadlineTimer(QDeadlineTimer::Forever));
// ### Qt6 inline this function
bool wait(unsigned long time);
static void sleep(unsigned long);
static void msleep(unsigned long);
static void usleep(unsigned long);
Q_SIGNALS:
void started(QPrivateSignal);
void finished(QPrivateSignal);
protected:
virtual void run();
int exec();
static void setTerminationEnabled(bool enabled = true);
protected:
QThread(QThreadPrivate &dd, QObject *parent = nullptr);
private:
Q_DECLARE_PRIVATE(QThread)
#if QT_CONFIG(cxx11_future)
static QThread *createThreadImpl(std::future<void> &&future);
#endif
friend class QCoreApplication;
friend class QThreadData;
};
#if QT_CONFIG(cxx11_future)
#if defined(QTHREAD_HAS_VARIADIC_CREATE) || defined(Q_CLANG_QDOC)
// C++17: std::thread's constructor complying call
template <typename Function, typename... Args>
QThread *QThread::create(Function &&f, Args &&... args)
{
using DecayedFunction = typename std::decay<Function>::type;
auto threadFunction =
[f = static_cast<DecayedFunction>(std::forward<Function>(f))](auto &&... largs) mutable -> void
{
(void)std::invoke(std::move(f), std::forward<decltype(largs)>(largs)...);
};
return createThreadImpl(std::async(std::launch::deferred,
std::move(threadFunction),
std::forward<Args>(args)...));
}
#elif defined(__cpp_init_captures) && __cpp_init_captures >= 201304
// C++14: implementation for just one callable
template <typename Function>
QThread *QThread::create(Function &&f)
{
using DecayedFunction = typename std::decay<Function>::type;
auto threadFunction =
[f = static_cast<DecayedFunction>(std::forward<Function>(f))]() mutable -> void
{
(void)f();
};
return createThreadImpl(std::async(std::launch::deferred, std::move(threadFunction)));
}
#else
// C++11: same as C++14, but with a workaround for not having generalized lambda captures
namespace QtPrivate {
template <typename Function>
struct Callable
{
explicit Callable(Function &&f)
: m_function(std::forward<Function>(f))
{
}
// Apply the same semantics of a lambda closure type w.r.t. the special
// member functions, if possible: delete the copy assignment operator,
// bring back all the others as per the RO5 (cf. §8.1.5.1/11 [expr.prim.lambda.closure])
~Callable() = default;
Callable(const Callable &) = default;
Callable(Callable &&) = default;
Callable &operator=(const Callable &) = delete;
Callable &operator=(Callable &&) = default;
void operator()()
{
(void)m_function();
}
typename std::decay<Function>::type m_function;
};
} // namespace QtPrivate
template <typename Function>
QThread *QThread::create(Function &&f)
{
return createThreadImpl(std::async(std::launch::deferred, QtPrivate::Callable<Function>(std::forward<Function>(f))));
}
#endif // QTHREAD_HAS_VARIADIC_CREATE
#endif // QT_CONFIG(cxx11_future)
QT_END_NAMESPACE
#endif // QTHREAD_H
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