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/****************************************************************************
**
** Copyright (C) 2010 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qtimestamp.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();
return GetTickCount();
}
bool QTimestamp::isMonotonic()
{
return true;
}
void QTimestamp::start()
{
t1 = getTickCount();
t2 = 0;
}
qint64 QTimestamp::elapsed() const
{
return getTickCount() - t1;
}
qint64 QTimestamp::msecsTo(const QTimestamp &other) const
{
return other.t1 - t1;
}
void QTimestamp::addMSecs(int ms)
{
t1 += ms;
}
qint64 QTimestamp::secsTo(const QTimestamp &other) const
{
return msecsTo(other) / 1000;
}
void QTimestamp::addSecs(int secs)
{
t1 += secs * 1000;
}
bool operator<(const QTimestamp &v1, const QTimestamp &v2)
{
return v1.t1 < v2.t1;
}
QT_END_NAMESPACE
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