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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qelapsedtimer.h"
#include <windows.h>
typedef ULONGLONG (WINAPI *PtrGetTickCount64)(void);
static PtrGetTickCount64 ptrGetTickCount64 = 0;
QT_BEGIN_NAMESPACE
static void resolveLibs()
{
static bool done = false;
if (done)
return;
// try to get GetTickCount64 from the system
HMODULE kernel32 = GetModuleHandleW(L"kernel32");
if (!kernel32)
return;
#if defined(Q_OS_WINCE)
// does this function exist on WinCE, or will ever exist?
ptrGetTickCount64 = (PtrGetTickCount64)GetProcAddress(kernel32, L"GetTickCount64");
#else
ptrGetTickCount64 = (PtrGetTickCount64)GetProcAddress(kernel32, "GetTickCount64");
#endif
done = true;
}
static quint64 getTickCount()
{
resolveLibs();
if (ptrGetTickCount64)
return ptrGetTickCount64();
static quint32 highdword = 0;
static quint32 lastval = 0;
quint32 val = GetTickCount();
if (val < lastval)
++highdword;
lastval = val;
return val | (quint64(highdword) << 32);
}
QElapsedTimer::ClockType QElapsedTimer::clockType()
{
return TickCounter;
}
bool QElapsedTimer::isMonotonic()
{
return true;
}
void QElapsedTimer::start()
{
t1 = getTickCount();
t2 = 0;
}
qint64 QElapsedTimer::restart()
{
qint64 oldt1 = t1;
t1 = getTickCount();
t2 = 0;
return t1 - oldt1;
}
qint64 QElapsedTimer::elapsed() const
{
return getTickCount() - t1;
}
qint64 QElapsedTimer::msecsSinceReference() const
{
return t1;
}
qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
{
return other.t1 - t1;
}
qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
{
return msecsTo(other) / 1000;
}
bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
{
return (v1.t1 - v2.t1) < 0;
}
QT_END_NAMESPACE
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