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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qelapsedtimer.h"
#include "qdeadlinetimer.h"
#include "qdeadlinetimer_p.h"
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
// Result of QueryPerformanceFrequency, 0 indicates that the high resolution timer is unavailable
static quint64 counterFrequency = 0;
static void resolveCounterFrequency()
{
static bool done = false;
if (done)
return;
// Retrieve the number of high-resolution performance counter ticks per second
LARGE_INTEGER frequency;
if (!QueryPerformanceFrequency(&frequency)) {
qFatal("QueryPerformanceFrequency failed, even though Microsoft documentation promises it wouldn't.");
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;
}
// GetTickCount(64) returns milliseconds
return ticks * 1000000;
}
static inline qint64 nanosecondsToTicks(qint64 nsec)
{
if (counterFrequency > 0) {
// QueryPerformanceCounter uses an arbitrary frequency
return double(nsec) * counterFrequency / 1000000000.;
}
// GetTickCount(64) uses milliseconds
return nsec / 1000000;
}
static quint64 getTickCount()
{
resolveCounterFrequency();
// This avoids a division by zero and disables the high performance counter if it's not available
if (counterFrequency > 0) {
LARGE_INTEGER counter;
bool ok = QueryPerformanceCounter(&counter);
Q_ASSERT_X(ok, "QElapsedTimer::start()",
"QueryPerformanceCounter failed, although QueryPerformanceFrequency succeeded.");
Q_UNUSED(ok);
return counter.QuadPart;
}
return GetTickCount64();
}
quint64 qt_msectime()
{
return ticksToNanoseconds(getTickCount()) / 1000000;
}
QElapsedTimer::ClockType QElapsedTimer::clockType() noexcept
{
resolveCounterFrequency();
return counterFrequency > 0 ? PerformanceCounter : TickCounter;
}
bool QElapsedTimer::isMonotonic() noexcept
{
return true;
}
void QElapsedTimer::start() noexcept
{
t1 = getTickCount();
t2 = 0;
}
qint64 QElapsedTimer::restart() noexcept
{
qint64 oldt1 = t1;
t1 = getTickCount();
t2 = 0;
return ticksToNanoseconds(t1 - oldt1) / 1000000;
}
qint64 QElapsedTimer::nsecsElapsed() const noexcept
{
qint64 elapsed = getTickCount() - t1;
return ticksToNanoseconds(elapsed);
}
qint64 QElapsedTimer::elapsed() const noexcept
{
qint64 elapsed = getTickCount() - t1;
return ticksToNanoseconds(elapsed) / 1000000;
}
qint64 QElapsedTimer::msecsSinceReference() const noexcept
{
return ticksToNanoseconds(t1) / 1000000;
}
qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const noexcept
{
qint64 difference = other.t1 - t1;
return ticksToNanoseconds(difference) / 1000000;
}
qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const noexcept
{
return msecsTo(other) / 1000;
}
bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2) noexcept
{
return (v1.t1 - v2.t1) < 0;
}
QDeadlineTimer QDeadlineTimer::current(Qt::TimerType timerType) noexcept
{
Q_STATIC_ASSERT(!QDeadlineTimerNanosecondsInT2);
QDeadlineTimer result;
result.t1 = ticksToNanoseconds(getTickCount());
result.type = timerType;
return result;
}
QT_END_NAMESPACE
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