LCOV - code coverage report
Current view: directory - nsprpub/pr/src/misc - prinrval.c (source / functions) Found Hit Coverage
Test: app.info Lines: 55 55 100.0 %
Date: 2012-06-02 Functions: 9 9 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is the Netscape Portable Runtime (NSPR).
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998-2000
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /*
      39                 :  * file:                        prinrval.c
      40                 :  * description:         implementation for the kernel interval timing functions
      41                 :  */
      42                 : 
      43                 : #include "primpl.h"
      44                 : 
      45                 : /*
      46                 :  *-----------------------------------------------------------------------
      47                 :  *
      48                 :  * _PR_InitClock --
      49                 :  *
      50                 :  *
      51                 :  *-----------------------------------------------------------------------
      52                 :  */
      53                 : 
      54           20034 : void _PR_InitClock(void)
      55                 : {
      56                 :     _PR_MD_INTERVAL_INIT();
      57                 : #ifdef DEBUG
      58                 :     {
      59           20034 :         PRIntervalTime ticksPerSec = PR_TicksPerSecond();
      60                 : 
      61           20034 :         PR_ASSERT(ticksPerSec >= PR_INTERVAL_MIN);
      62           20034 :         PR_ASSERT(ticksPerSec <= PR_INTERVAL_MAX);
      63                 :     }
      64                 : #endif /* DEBUG */
      65           20034 : }
      66                 : 
      67                 : /*
      68                 :  * This version of interval times is based on the time of day
      69                 :  * capability offered by system. This isn't valid for two reasons:
      70                 :  * 1) The time of day is neither linear nor montonically increasing
      71                 :  * 2) The units here are milliseconds. That's not appropriate for our use.
      72                 :  */
      73                 : 
      74          930201 : PR_IMPLEMENT(PRIntervalTime) PR_IntervalNow(void)
      75                 : {
      76          930201 :     if (!_pr_initialized) _PR_ImplicitInitialization();
      77          930201 :     return _PR_MD_GET_INTERVAL();
      78                 : }  /* PR_IntervalNow */
      79                 : 
      80          541774 : PR_EXTERN(PRUint32) PR_TicksPerSecond(void)
      81                 : {
      82          541774 :     if (!_pr_initialized) _PR_ImplicitInitialization();
      83          541774 :     return _PR_MD_INTERVAL_PER_SEC();
      84                 : }  /* PR_TicksPerSecond */
      85                 : 
      86           72129 : PR_IMPLEMENT(PRIntervalTime) PR_SecondsToInterval(PRUint32 seconds)
      87                 : {
      88           72129 :     return seconds * PR_TicksPerSecond();
      89                 : }  /* PR_SecondsToInterval */
      90                 : 
      91          203413 : PR_IMPLEMENT(PRIntervalTime) PR_MillisecondsToInterval(PRUint32 milli)
      92                 : {
      93                 :     PRIntervalTime ticks;
      94                 :     PRUint64 tock, tps, msecPerSec, rounding;
      95          203413 :     LL_UI2L(tock, milli);
      96          203413 :     LL_I2L(msecPerSec, PR_MSEC_PER_SEC);
      97          203413 :     LL_I2L(rounding, (PR_MSEC_PER_SEC >> 1));
      98          203413 :     LL_I2L(tps, PR_TicksPerSecond());
      99          203413 :     LL_MUL(tock, tock, tps);
     100          203413 :     LL_ADD(tock, tock, rounding);
     101          203413 :     LL_DIV(tock, tock, msecPerSec);
     102          203413 :     LL_L2UI(ticks, tock);
     103          203413 :     return ticks;
     104                 : }  /* PR_MillisecondsToInterval */
     105                 : 
     106           47469 : PR_IMPLEMENT(PRIntervalTime) PR_MicrosecondsToInterval(PRUint32 micro)
     107                 : {
     108                 :     PRIntervalTime ticks;
     109                 :     PRUint64 tock, tps, usecPerSec, rounding;
     110           47469 :     LL_UI2L(tock, micro);
     111           47469 :     LL_I2L(usecPerSec, PR_USEC_PER_SEC);
     112           47469 :     LL_I2L(rounding, (PR_USEC_PER_SEC >> 1));
     113           47469 :     LL_I2L(tps, PR_TicksPerSecond());
     114           47469 :     LL_MUL(tock, tock, tps);
     115           47469 :     LL_ADD(tock, tock, rounding);
     116           47469 :     LL_DIV(tock, tock, usecPerSec);
     117           47469 :     LL_L2UI(ticks, tock);
     118           47469 :     return ticks;
     119                 : }  /* PR_MicrosecondsToInterval */
     120                 : 
     121           61511 : PR_IMPLEMENT(PRUint32) PR_IntervalToSeconds(PRIntervalTime ticks)
     122                 : {
     123           61511 :     return ticks / PR_TicksPerSecond();
     124                 : }  /* PR_IntervalToSeconds */
     125                 : 
     126           61536 : PR_IMPLEMENT(PRUint32) PR_IntervalToMilliseconds(PRIntervalTime ticks)
     127                 : {
     128                 :     PRUint32 milli;
     129                 :     PRUint64 tock, tps, msecPerSec, rounding;
     130           61536 :     LL_UI2L(tock, ticks);
     131           61536 :     LL_I2L(msecPerSec, PR_MSEC_PER_SEC);
     132           61536 :     LL_I2L(tps, PR_TicksPerSecond());
     133           61536 :     LL_USHR(rounding, tps, 1);
     134           61536 :     LL_MUL(tock, tock, msecPerSec);
     135           61536 :     LL_ADD(tock, tock, rounding);
     136           61536 :     LL_DIV(tock, tock, tps);
     137           61536 :     LL_L2UI(milli, tock);
     138           61536 :     return milli;
     139                 : }  /* PR_IntervalToMilliseconds */
     140                 : 
     141           36642 : PR_IMPLEMENT(PRUint32) PR_IntervalToMicroseconds(PRIntervalTime ticks)
     142                 : {
     143                 :     PRUint32 micro;
     144                 :     PRUint64 tock, tps, usecPerSec, rounding;
     145           36642 :     LL_UI2L(tock, ticks);
     146           36642 :     LL_I2L(usecPerSec, PR_USEC_PER_SEC);
     147           36642 :     LL_I2L(tps, PR_TicksPerSecond());
     148           36642 :     LL_USHR(rounding, tps, 1);
     149           36642 :     LL_MUL(tock, tock, usecPerSec);
     150           36642 :     LL_ADD(tock, tock, rounding);
     151           36642 :     LL_DIV(tock, tock, tps);
     152           36642 :     LL_L2UI(micro, tock);
     153           36642 :     return micro;
     154                 : }  /* PR_IntervalToMicroseconds */
     155                 : 
     156                 : /* prinrval.c */
     157                 : 

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