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diff --git a/src/corelib/thread/qmutexpool.cpp b/src/corelib/thread/qmutexpool.cpp
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--- a/src/corelib/thread/qmutexpool.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** 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.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qatomic.h"
-#include "qmutexpool_p.h"
-
-QT_BEGIN_NAMESPACE
-
-Q_GLOBAL_STATIC_WITH_ARGS(QMutexPool, globalMutexPool, (QMutex::Recursive))
-
-/*!
-    \class QMutexPool
-    \inmodule QtCore
-    \brief The QMutexPool class provides a pool of QMutex objects.
-
-    \internal
-
-    \ingroup thread
-
-    QMutexPool is a convenience class that provides access to a fixed
-    number of QMutex objects.
-
-    Typical use of a QMutexPool is in situations where it is not
-    possible or feasible to use one QMutex for every protected object.
-    The mutex pool will return a mutex based on the address of the
-    object that needs protection.
-
-    For example, consider this simple class:
-
-    \snippet code/src_corelib_thread_qmutexpool.cpp 0
-
-    Adding a QMutex member to the Number class does not make sense,
-    because it is so small. However, in order to ensure that access to
-    each Number is protected, you need to use a mutex. In this case, a
-    QMutexPool would be ideal.
-
-    Code to calculate the square of a number would then look something
-    like this:
-
-    \snippet code/src_corelib_thread_qmutexpool.cpp 1
-
-    This function will safely calculate the square of a number, since
-    it uses a mutex from a QMutexPool. The mutex is locked and
-    unlocked automatically by the QMutexLocker class. See the
-    QMutexLocker documentation for more details.
-*/
-
-/*!
-    Constructs  a QMutexPool, reserving space for \a size QMutexes. All
-    mutexes in the pool are created with \a recursionMode. By default,
-    all mutexes are non-recursive.
-
-    The QMutexes are created when needed, and deleted when the
-    QMutexPool is destructed.
-*/
-QMutexPool::QMutexPool(QMutex::RecursionMode recursionMode, int size)
-    : mutexes(size), recursionMode(recursionMode)
-{
-    for (int index = 0; index < mutexes.count(); ++index) {
-        mutexes[index].store(0);
-    }
-}
-
-/*!
-    Destructs a QMutexPool. All QMutexes that were created by the pool
-    are deleted.
-*/
-QMutexPool::~QMutexPool()
-{
-    for (int index = 0; index < mutexes.count(); ++index)
-        delete mutexes[index].loadAcquire();
-}
-
-/*!
-    Returns the global QMutexPool instance.
-*/
-QMutexPool *QMutexPool::instance()
-{
-    return globalMutexPool();
-}
-
-/*!
-    \fn QMutexPool::get(const void *address)
-    Returns a QMutex from the pool. QMutexPool uses the value \a address
-    to determine which mutex is returned from the pool.
-*/
-
-/*!
-    \internal
-  create the mutex for the given index
- */
-QMutex *QMutexPool::createMutex(int index)
-{
-    // mutex not created, create one
-    QMutex *newMutex = new QMutex(recursionMode);
-    if (!mutexes[index].testAndSetRelease(nullptr, newMutex)) {
-        delete newMutex;
-        return mutexes[index].loadAcquire();
-    } else {
-        return newMutex;
-    }
-}
-
-/*!
-    Returns a QMutex from the global mutex pool.
-*/
-QMutex *QMutexPool::globalInstanceGet(const void *address)
-{
-    QMutexPool * const globalInstance = globalMutexPool();
-    if (globalInstance == 0)
-        return 0;
-    return globalInstance->get(address);
-}
-
-QT_END_NAMESPACE