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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/*
* 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 */
}
/*
* This version of interval times is based on the time of day
* capability offered by system. This isn't valid for two reasons:
* 1) The time of day is neither linear nor montonically increasing
* 2) The units here are milliseconds. That's not appropriate for our use.
*/
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 */
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