/**************************************************************************** | |
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** This file is part of the QtCore module of the Qt Toolkit. | |
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** $QT_BEGIN_LICENSE:LGPL$ | |
** GNU Lesser General Public License Usage | |
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** | |
** GNU General Public License Usage | |
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****************************************************************************/ | |
#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 |