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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.
*/
/*
* 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()
{
ULONG timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
APIRET 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(×tamp);
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;
}
}
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