blob: 4006f5f2b0aab48eb3893836e62444f5bf43ee46 [file] [log] [blame] [edit]
/* -*- 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 ***** */
/*
* OS/2 interval timers
*
*/
#include "primpl.h"
static PRBool useHighResTimer = PR_FALSE;
PRIntervalTime _os2_ticksPerSec = -1;
PRIntn _os2_bitShift = 0;
PRInt32 _os2_highMask = 0;
void
_PR_MD_INTERVAL_INIT()
{
char *envp;
ULONG timerFreq;
APIRET rc;
if ((envp = getenv("NSPR_OS2_NO_HIRES_TIMER")) != NULL) {
if (atoi(envp) == 1)
return;
}
timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
rc = DosTmrQueryFreq(&timerFreq);
if (NO_ERROR == rc) {
useHighResTimer = PR_TRUE;
PR_ASSERT(timerFreq != 0);
while (timerFreq > PR_INTERVAL_MAX) {
timerFreq >>= 1;
_os2_bitShift++;
_os2_highMask = (_os2_highMask << 1)+1;
}
_os2_ticksPerSec = timerFreq;
PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN);
}
}
PRIntervalTime
_PR_MD_GET_INTERVAL()
{
if (useHighResTimer) {
QWORD timestamp;
PRInt32 top;
APIRET rc = DosTmrQueryTime(&timestamp);
if (NO_ERROR != rc) {
return -1;
}
/* Sadly, nspr requires the interval to range from 1000 ticks per
* second to only 100000 ticks per second. DosTmrQueryTime is too
* high resolution...
*/
top = timestamp.ulHi & _os2_highMask;
top = top << (32 - _os2_bitShift);
timestamp.ulLo = timestamp.ulLo >> _os2_bitShift;
timestamp.ulLo = timestamp.ulLo + top;
return (PRUint32)timestamp.ulLo;
} else {
ULONG msCount = -1;
DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount));
return msCount;
}
}
PRIntervalTime
_PR_MD_INTERVAL_PER_SEC()
{
if (useHighResTimer) {
return _os2_ticksPerSec;
} else {
return 1000;
}
}