diff options
Diffstat (limited to 'pr/src/md/os2/os2inrval.c')
-rw-r--r-- | pr/src/md/os2/os2inrval.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/pr/src/md/os2/os2inrval.c b/pr/src/md/os2/os2inrval.c new file mode 100644 index 0000000..4006f5f --- /dev/null +++ b/pr/src/md/os2/os2inrval.c @@ -0,0 +1,112 @@ +/* -*- 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(×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; + } +} |