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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/*
* 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(×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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