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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qelapsedtimer.h"
#include <windows.h>
#include <private/qsystemlibrary_p.h>
typedef ULONGLONG (WINAPI *PtrGetTickCount64)(void);
static PtrGetTickCount64 ptrGetTickCount64 = 0;
QT_BEGIN_NAMESPACE
// Result of QueryPerformanceFrequency, 0 indicates that the high resolution timer is unavailable
static quint64 counterFrequency = 0;
static void resolveLibs()
{
static volatile bool done = false;
if (done)
return;
// try to get GetTickCount64 from the system
QSystemLibrary kernel32(QLatin1String("kernel32"));
if (!kernel32.load())
return;
// does this function exist on WinCE, or will ever exist?
ptrGetTickCount64 = (PtrGetTickCount64)kernel32.resolve("GetTickCount64");
// Retrieve the number of high-resolution performance counter ticks per second
LARGE_INTEGER frequency;
if (!QueryPerformanceFrequency(&frequency)) {
counterFrequency = 0;
} else {
counterFrequency = frequency.QuadPart;
}
done = true;
}
static inline qint64 ticksToNanoseconds(qint64 ticks)
{
if (counterFrequency > 0) {
// QueryPerformanceCounter uses an arbitrary frequency
qint64 seconds = ticks / counterFrequency;
qint64 nanoSeconds = (ticks - seconds * counterFrequency) * 1000000000 / counterFrequency;
return seconds * 1000000000 + nanoSeconds;
} else {
// GetTickCount(64) return milliseconds
return ticks * 1000000;
}
}
static quint64 getTickCount()
{
resolveLibs();
// This avoids a division by zero and disables the high performance counter if it's not available
if (counterFrequency > 0) {
LARGE_INTEGER counter;
if (QueryPerformanceCounter(&counter)) {
return counter.QuadPart;
} else {
qWarning("QueryPerformanceCounter failed, although QueryPerformanceFrequency succeeded.");
return 0;
}
}
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()
{
resolveLibs();
if (counterFrequency > 0)
return PerformanceCounter;
else
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 ticksToNanoseconds(t1 - oldt1) / 1000000;
}
qint64 QElapsedTimer::nsecsElapsed() const
{
qint64 elapsed = getTickCount() - t1;
return ticksToNanoseconds(elapsed);
}
qint64 QElapsedTimer::elapsed() const
{
qint64 elapsed = getTickCount() - t1;
return ticksToNanoseconds(elapsed) / 1000000;
}
qint64 QElapsedTimer::msecsSinceReference() const
{
return ticksToNanoseconds(t1) / 1000000;
}
qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
{
qint64 difference = other.t1 - t1;
return ticksToNanoseconds(difference) / 1000000;
}
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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