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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 "qpair.h"
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#if !defined(QT_NO_CLOCK_MONOTONIC)
# if defined(QT_BOOTSTRAPPED)
# define QT_NO_CLOCK_MONOTONIC
# endif
#endif
QT_BEGIN_NAMESPACE
static qint64 fractionAdjustment()
{
if (QElapsedTimer::isMonotonic()) {
// the monotonic timer is measured in nanoseconds
// 1 ms = 1000000 ns
return 1000*1000ull;
} else {
// gettimeofday is measured in microseconds
// 1 ms = 1000 us
return 1000;
}
}
bool QElapsedTimer::isMonotonic()
{
#if (_POSIX_MONOTONIC_CLOCK-0 > 0)
return true;
#else
static int returnValue = 0;
if (returnValue == 0) {
# if (_POSIX_MONOTONIC_CLOCK-0 < 0)
returnValue = -1;
# elif (_POSIX_MONOTONIC_CLOCK == 0)
// detect if the system support monotonic timers
long x = sysconf(_SC_MONOTONIC_CLOCK);
returnValue = (x >= 200112L) ? 1 : -1;
# endif
}
return returnValue != -1;
#endif
}
static inline QPair<long, long> do_gettime()
{
#if (_POSIX_MONOTONIC_CLOCK-0 > 0)
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return qMakePair(ts.tv_sec, ts.tv_nsec);
#else
# if !defined(QT_NO_CLOCK_MONOTONIC) && !defined(QT_BOOTSTRAPPED)
if (QElapsedTimer::isMonotonic()) {
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return qMakePair(ts.tv_sec, ts.tv_nsec);
}
# endif
// use gettimeofday
timeval tv;
::gettimeofday(&tv, 0);
return qMakePair(tv.tv_sec, tv.tv_usec);
#endif
}
// used in qcore_unix.cpp and qeventdispatcher_unix.cpp
timeval qt_gettime()
{
QPair<long, long> r = do_gettime();
timeval tv;
tv.tv_sec = r.first;
tv.tv_usec = r.second;
if (QElapsedTimer::isMonotonic())
tv.tv_usec /= 1000;
return tv;
}
void QElapsedTimer::start()
{
QPair<long, long> r = do_gettime();
t1 = r.first;
t2 = r.second;
}
qint64 QElapsedTimer::restart()
{
QPair<long, long> r = do_gettime();
qint64 oldt1 = t1;
qint64 oldt2 = t2;
t1 = r.first;
t2 = r.second;
r.first -= oldt1;
r.second -= oldt2;
return r.first * 1000 + r.second / fractionAdjustment();
}
qint64 QElapsedTimer::elapsed() const
{
QElapsedTimer now;
now.start();
return msecsTo(now);
}
qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
{
qint64 secs = other.t1 - t1;
qint64 fraction = other.t2 - t2;
return secs * 1000 + fraction / fractionAdjustment();
}
qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
{
return other.t1 - t1;
}
bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
{
return v1.t1 < v2.t1 || (v1.t1 == v2.t1 && v1.t2 < v2.t2);
}
QT_END_NAMESPACE
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