Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/*
* file: prinrval.c
* description: implementation for the kernel interval timing functions
*/
#include "primpl.h"
/*
*-----------------------------------------------------------------------
*
* _PR_InitClock --
*
*
*-----------------------------------------------------------------------
*/
void _PR_InitClock(void)
{
_PR_MD_INTERVAL_INIT();
#ifdef DEBUG
{
PRIntervalTime ticksPerSec = PR_TicksPerSecond();
PR_ASSERT(ticksPerSec >= PR_INTERVAL_MIN);
PR_ASSERT(ticksPerSec <= PR_INTERVAL_MAX);
}
#endif /* DEBUG */
}
PR_IMPLEMENT(PRIntervalTime) PR_IntervalNow(void)
{
if (!_pr_initialized) {
_PR_ImplicitInitialization();
}
return _PR_MD_GET_INTERVAL();
} /* PR_IntervalNow */
PR_EXTERN(PRUint32) PR_TicksPerSecond(void)
{
if (!_pr_initialized) {
_PR_ImplicitInitialization();
}
return _PR_MD_INTERVAL_PER_SEC();
} /* PR_TicksPerSecond */
PR_IMPLEMENT(PRIntervalTime) PR_SecondsToInterval(PRUint32 seconds)
{
return seconds * PR_TicksPerSecond();
} /* PR_SecondsToInterval */
PR_IMPLEMENT(PRIntervalTime) PR_MillisecondsToInterval(PRUint32 milli)
{
PRIntervalTime ticks;
PRUint64 tock, tps, msecPerSec, rounding;
LL_UI2L(tock, milli);
LL_I2L(msecPerSec, PR_MSEC_PER_SEC);
LL_I2L(rounding, (PR_MSEC_PER_SEC >> 1));
LL_I2L(tps, PR_TicksPerSecond());
LL_MUL(tock, tock, tps);
LL_ADD(tock, tock, rounding);
LL_DIV(tock, tock, msecPerSec);
LL_L2UI(ticks, tock);
return ticks;
} /* PR_MillisecondsToInterval */
PR_IMPLEMENT(PRIntervalTime) PR_MicrosecondsToInterval(PRUint32 micro)
{
PRIntervalTime ticks;
PRUint64 tock, tps, usecPerSec, rounding;
LL_UI2L(tock, micro);
LL_I2L(usecPerSec, PR_USEC_PER_SEC);
LL_I2L(rounding, (PR_USEC_PER_SEC >> 1));
LL_I2L(tps, PR_TicksPerSecond());
LL_MUL(tock, tock, tps);
LL_ADD(tock, tock, rounding);
LL_DIV(tock, tock, usecPerSec);
LL_L2UI(ticks, tock);
return ticks;
} /* PR_MicrosecondsToInterval */
PR_IMPLEMENT(PRUint32) PR_IntervalToSeconds(PRIntervalTime ticks)
{
return ticks / PR_TicksPerSecond();
} /* PR_IntervalToSeconds */
PR_IMPLEMENT(PRUint32) PR_IntervalToMilliseconds(PRIntervalTime ticks)
{
PRUint32 milli;
PRUint64 tock, tps, msecPerSec, rounding;
LL_UI2L(tock, ticks);
LL_I2L(msecPerSec, PR_MSEC_PER_SEC);
LL_I2L(tps, PR_TicksPerSecond());
LL_USHR(rounding, tps, 1);
LL_MUL(tock, tock, msecPerSec);
LL_ADD(tock, tock, rounding);
LL_DIV(tock, tock, tps);
LL_L2UI(milli, tock);
return milli;
} /* PR_IntervalToMilliseconds */
PR_IMPLEMENT(PRUint32) PR_IntervalToMicroseconds(PRIntervalTime ticks)
{
PRUint32 micro;
PRUint64 tock, tps, usecPerSec, rounding;
LL_UI2L(tock, ticks);
LL_I2L(usecPerSec, PR_USEC_PER_SEC);
LL_I2L(tps, PR_TicksPerSecond());
LL_USHR(rounding, tps, 1);
LL_MUL(tock, tock, usecPerSec);
LL_ADD(tock, tock, rounding);
LL_DIV(tock, tock, tps);
LL_L2UI(micro, tock);
return micro;
} /* PR_IntervalToMicroseconds */
/* prinrval.c */