qelapsedtimer_mac.cpp File Reference

#include "qelapsedtimer.h"
#include <sys/time.h>
#include <unistd.h>
#include <mach/mach_time.h>

Go to the source code of this file.

Functions
static qint64	absoluteToMSecs (qint64 cpuTime)
static qint64	absoluteToNSecs (qint64 cpuTime)
bool	operator< (const QElapsedTimer &v1, const QElapsedTimer &v2)
timeval	qt_gettime ()

Variables
static mach_timebase_info_data_t	info = {0,0}

Function Documentation

absoluteToMSecs()

static qint64 absoluteToMSecs ( qint64  cpuTime )

static

Definition at line 69 of file qelapsedtimer_mac.cpp.

Referenced by qt_gettime().

{
    return absoluteToNSecs(cpuTime) / 1000000;
}

absoluteToNSecs()

static qint64 absoluteToNSecs ( qint64  cpuTime )

static

Definition at line 61 of file qelapsedtimer_mac.cpp.

Referenced by absoluteToMSecs(), and qt_gettime().

{
    if (info.denom == 0)
        mach_timebase_info(&info);
    qint64 nsecs = cpuTime * info.numer / info.denom;
    return nsecs;
}

operator<()

bool operator<	(	const QElapsedTimer &	v1,
		const QElapsedTimer &	v2
	)

Definition at line 127 of file qelapsedtimer_mac.cpp.

{
    return v1.t1 < v2.t1;
}

qt_gettime()

timeval qt_gettime

(

)

Definition at line 74 of file qelapsedtimer_mac.cpp.

{
    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;
}

Variable Documentation

info

mach_timebase_info_data_t info = {0,0}

static

Definition at line 60 of file qelapsedtimer_mac.cpp.

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