diff options
Diffstat (limited to 'mozilla/nsprpub/pr/src/misc/prinrval.c')
| -rw-r--r-- | mozilla/nsprpub/pr/src/misc/prinrval.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/mozilla/nsprpub/pr/src/misc/prinrval.c b/mozilla/nsprpub/pr/src/misc/prinrval.c new file mode 100644 index 0000000..17229e8 --- /dev/null +++ b/mozilla/nsprpub/pr/src/misc/prinrval.c @@ -0,0 +1,157 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * 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 the Initial Developer are Copyright (C) 1998-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +/* + * 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 */ + |