[PySide] Please extract this C++ Qt6 code when compiling PySide6

Keith Kyzivat keith.kyzivat at qt.io
Fri Sep 3 17:42:20 CEST 2021

Shiboken does not support C++ Templates – that is likely the reason this is not included.

From: PySide <pyside-bounces at qt-project.org> On Behalf Of Boštjan Mejak
Sent: Friday, September 3, 2021 11:38 AM
To: pyside at qt-project.org
Subject: [PySide] Please extract this C++ Qt6 code when compiling PySide6

The start() method of PySide6.QtCore.QThreadPool should also extract this code that Qt6 has:

void QThreadPool::start(std::function<void()> functionToRun, int priority)


    if (!functionToRun)


    start(QRunnable::create(std::move(functionToRun)), priority);


and, of course

bool QThreadPool::tryStart(std::function<void()> functionToRun)


    if (!functionToRun)

        return false;


    QMutexLocker locker(&d->mutex);

    if (!d->allThreads.isEmpty() && d->activeThreadCount() >= d->maxThreadCount())

        return false;

    QRunnable *runnable = QRunnable::create(std::move(functionToRun));

    if (d->tryStart(runnable))

        return true;

    delete runnable;

    return false;


The declarations are there in the C++ header file (qthreadpool.h) for both. I don't understand why isn't this extracted at PySide6 compile time.

void start(std::function<void()> functionToRun, int priority = 0);

bool tryStart(std::function<void()> functionToRun);

So extract start() and tryStart(), please. This is so convenient. Not sure why you guys ignore this.

The qthreadpool.cpp source code is here: https://github.com/qt/qtbase/blob/dev/src/corelib/thread/qthreadpool.cpp
And the qthreadpool.h header file is here: https://github.com/qt/qtbase/blob/dev/src/corelib/thread/qthreadpool.h
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