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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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* The Original Code is the Netscape Portable Runtime (NSPR).
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998-2000 Netscape Communications Corporation. All
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* OS/2 interval timers
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static PRBool useHighResTimer = PR_FALSE;
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PRIntervalTime _os2_ticksPerSec = -1;
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PRIntn _os2_bitShift = 0;
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PRInt32 _os2_highMask = 0;
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_PR_MD_INTERVAL_INIT()
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if ((envp = getenv("NSPR_OS2_NO_HIRES_TIMER")) != NULL) {
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timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
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rc = DosTmrQueryFreq(&timerFreq);
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useHighResTimer = PR_TRUE;
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PR_ASSERT(timerFreq != 0);
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while (timerFreq > PR_INTERVAL_MAX) {
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_os2_highMask = (_os2_highMask << 1)+1;
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_os2_ticksPerSec = timerFreq;
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PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN);
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if (useHighResTimer) {
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APIRET rc = DosTmrQueryTime(×tamp);
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/* Sadly, nspr requires the interval to range from 1000 ticks per
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* second to only 100000 ticks per second. DosTmrQueryTime is too
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top = timestamp.ulHi & _os2_highMask;
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top = top << (32 - _os2_bitShift);
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timestamp.ulLo = timestamp.ulLo >> _os2_bitShift;
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timestamp.ulLo = timestamp.ulLo + top;
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return (PRUint32)timestamp.ulLo;
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DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount));
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_PR_MD_INTERVAL_PER_SEC()
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if (useHighResTimer) {
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return _os2_ticksPerSec;