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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 "qelapsedtimer.h"
#include <sys/time.h>
#include <unistd.h>
#include <mach/mach_time.h>
QT_BEGIN_NAMESPACE
QElapsedTimer::ClockType QElapsedTimer::clockType()
{
return MachAbsoluteTime;
}
bool QElapsedTimer::isMonotonic()
{
return true;
}
static mach_timebase_info_data_t info = {0,0};
static qint64 absoluteToNSecs(qint64 cpuTime)
{
if (info.denom == 0)
mach_timebase_info(&info);
qint64 nsecs = cpuTime * info.numer / info.denom;
return nsecs;
}
static qint64 absoluteToMSecs(qint64 cpuTime)
{
return absoluteToNSecs(cpuTime) / 1000000;
}
timeval qt_gettime()
{
timeval tv;
uint64_t cpu_time = mach_absolute_time();
uint64_t nsecs = absoluteToNSecs(cpu_time);
tv.tv_sec = nsecs / 1000000000ull;
tv.tv_usec = (nsecs / 1000) - (tv.tv_sec * 1000000);
return tv;
}
void QElapsedTimer::start()
{
t1 = mach_absolute_time();
t2 = 0;
}
qint64 QElapsedTimer::restart()
{
qint64 old = t1;
t1 = mach_absolute_time();
t2 = 0;
return absoluteToMSecs(t1 - old);
}
qint64 QElapsedTimer::elapsed() const
{
uint64_t cpu_time = mach_absolute_time();
return absoluteToMSecs(cpu_time - t1);
}
qint64 QElapsedTimer::msecsSinceReference() const
{
return absoluteToMSecs(t1);
}
qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
{
return absoluteToMSecs(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;
}
QT_END_NAMESPACE
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