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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 QTHREADPOOL_H
#define QTHREADPOOL_H
#include <QtCore/qglobal.h>
#include <QtCore/qthread.h>
#include <QtCore/qrunnable.h>
#include <functional>
QT_REQUIRE_CONFIG(thread);
QT_BEGIN_NAMESPACE
class QThreadPoolPrivate;
class Q_CORE_EXPORT QThreadPool : public QObject
{
Q_OBJECT
Q_DECLARE_PRIVATE(QThreadPool)
Q_PROPERTY(int expiryTimeout READ expiryTimeout WRITE setExpiryTimeout)
Q_PROPERTY(int maxThreadCount READ maxThreadCount WRITE setMaxThreadCount)
Q_PROPERTY(int activeThreadCount READ activeThreadCount)
Q_PROPERTY(uint stackSize READ stackSize WRITE setStackSize)
Q_PROPERTY(QThread::Priority threadPriority READ threadPriority WRITE setThreadPriority)
friend class QFutureInterfaceBase;
public:
QThreadPool(QObject *parent = nullptr);
~QThreadPool();
static QThreadPool *globalInstance();
void start(QRunnable *runnable, int priority = 0);
bool tryStart(QRunnable *runnable);
#if QT_CORE_REMOVED_SINCE(6, 6)
void start(std::function<void()> functionToRun, int priority = 0);
bool tryStart(std::function<void()> functionToRun);
#endif
void startOnReservedThread(QRunnable *runnable);
#if QT_CORE_REMOVED_SINCE(6, 6)
void startOnReservedThread(std::function<void()> functionToRun);
#endif
template <typename Callable, QRunnable::if_callable<Callable> = true>
void start(Callable &&functionToRun, int priority = 0);
template <typename Callable, QRunnable::if_callable<Callable> = true>
bool tryStart(Callable &&functionToRun);
template <typename Callable, QRunnable::if_callable<Callable> = true>
void startOnReservedThread(Callable &&functionToRun);
int expiryTimeout() const;
void setExpiryTimeout(int expiryTimeout);
int maxThreadCount() const;
void setMaxThreadCount(int maxThreadCount);
int activeThreadCount() const;
void setStackSize(uint stackSize);
uint stackSize() const;
void setThreadPriority(QThread::Priority priority);
QThread::Priority threadPriority() const;
void reserveThread();
void releaseThread();
bool waitForDone(int msecs = -1);
void clear();
bool contains(const QThread *thread) const;
[[nodiscard]] bool tryTake(QRunnable *runnable);
};
template <typename Callable, QRunnable::if_callable<Callable>>
void QThreadPool::start(Callable &&functionToRun, int priority)
{
start(QRunnable::create(std::forward<Callable>(functionToRun)), priority);
}
template <typename Callable, QRunnable::if_callable<Callable>>
bool QThreadPool::tryStart(Callable &&functionToRun)
{
QRunnable *runnable = QRunnable::create(std::forward<Callable>(functionToRun));
if (tryStart(runnable))
return true;
delete runnable;
return false;
}
template <typename Callable, QRunnable::if_callable<Callable>>
void QThreadPool::startOnReservedThread(Callable &&functionToRun)
{
startOnReservedThread(QRunnable::create(std::forward<Callable>(functionToRun)));
}
QT_END_NAMESPACE
#endif
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