/* 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, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*

 * 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 */