nsprpub/pr/src/md/os2/os2inrval.c@6474c204b198 (annotated)
nsprpub/pr/src/md/os2/os2inrval.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | /* |
| michael@0 | 7 | * OS/2 interval timers |
| michael@0 | 8 | * |
| michael@0 | 9 | */ |
| michael@0 | 10 | |
| michael@0 | 11 | #include "primpl.h" |
| michael@0 | 12 | |
| michael@0 | 13 | static PRBool useHighResTimer = PR_FALSE; |
| michael@0 | 14 | PRIntervalTime _os2_ticksPerSec = -1; |
| michael@0 | 15 | PRIntn _os2_bitShift = 0; |
| michael@0 | 16 | PRInt32 _os2_highMask = 0; |
| michael@0 | 17 | |
| michael@0 | 18 | void |
| michael@0 | 19 | _PR_MD_INTERVAL_INIT() |
| michael@0 | 20 | { |
| michael@0 | 21 | char *envp; |
| michael@0 | 22 | ULONG timerFreq; |
| michael@0 | 23 | APIRET rc; |
| michael@0 | 24 | |
| michael@0 | 25 | if ((envp = getenv("NSPR_OS2_NO_HIRES_TIMER")) != NULL) { |
| michael@0 | 26 | if (atoi(envp) == 1) |
| michael@0 | 27 | return; |
| michael@0 | 28 | } |
| michael@0 | 29 | |
| michael@0 | 30 | timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */ |
| michael@0 | 31 | rc = DosTmrQueryFreq(&timerFreq); |
| michael@0 | 32 | if (NO_ERROR == rc) { |
| michael@0 | 33 | useHighResTimer = PR_TRUE; |
| michael@0 | 34 | PR_ASSERT(timerFreq != 0); |
| michael@0 | 35 | while (timerFreq > PR_INTERVAL_MAX) { |
| michael@0 | 36 | timerFreq >>= 1; |
| michael@0 | 37 | _os2_bitShift++; |
| michael@0 | 38 | _os2_highMask = (_os2_highMask << 1)+1; |
| michael@0 | 39 | } |
| michael@0 | 40 | |
| michael@0 | 41 | _os2_ticksPerSec = timerFreq; |
| michael@0 | 42 | PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN); |
| michael@0 | 43 | } |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | PRIntervalTime |
| michael@0 | 47 | _PR_MD_GET_INTERVAL() |
| michael@0 | 48 | { |
| michael@0 | 49 | if (useHighResTimer) { |
| michael@0 | 50 | QWORD timestamp; |
| michael@0 | 51 | PRInt32 top; |
| michael@0 | 52 | APIRET rc = DosTmrQueryTime(×tamp); |
| michael@0 | 53 | if (NO_ERROR != rc) { |
| michael@0 | 54 | return -1; |
| michael@0 | 55 | } |
| michael@0 | 56 | /* Sadly, nspr requires the interval to range from 1000 ticks per |
| michael@0 | 57 | * second to only 100000 ticks per second. DosTmrQueryTime is too |
| michael@0 | 58 | * high resolution... |
| michael@0 | 59 | */ |
| michael@0 | 60 | top = timestamp.ulHi & _os2_highMask; |
| michael@0 | 61 | top = top << (32 - _os2_bitShift); |
| michael@0 | 62 | timestamp.ulLo = timestamp.ulLo >> _os2_bitShift; |
| michael@0 | 63 | timestamp.ulLo = timestamp.ulLo + top; |
| michael@0 | 64 | return (PRUint32)timestamp.ulLo; |
| michael@0 | 65 | } else { |
| michael@0 | 66 | ULONG msCount = -1; |
| michael@0 | 67 | DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount)); |
| michael@0 | 68 | return msCount; |
| michael@0 | 69 | } |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | PRIntervalTime |
| michael@0 | 73 | _PR_MD_INTERVAL_PER_SEC() |
| michael@0 | 74 | { |
| michael@0 | 75 | if (useHighResTimer) { |
| michael@0 | 76 | return _os2_ticksPerSec; |
| michael@0 | 77 | } else { |
| michael@0 | 78 | return 1000; |
| michael@0 | 79 | } |
| michael@0 | 80 | } |
