The Tor Browser / file comparison
comparison: nsprpub/pr/src/md/os2/os2inrval.c
nsprpub/pr/src/md/os2/os2inrval.c
- branch
- TOR_BUG_3246
- changeset 5
- 4ab42b5ab56c
equal
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replaced
| -1:000000000000 | 0:7c44b54ddb61 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* | |
| 7 * OS/2 interval timers | |
| 8 * | |
| 9 */ | |
| 10 | |
| 11 #include "primpl.h" | |
| 12 | |
| 13 static PRBool useHighResTimer = PR_FALSE; | |
| 14 PRIntervalTime _os2_ticksPerSec = -1; | |
| 15 PRIntn _os2_bitShift = 0; | |
| 16 PRInt32 _os2_highMask = 0; | |
| 17 | |
| 18 void | |
| 19 _PR_MD_INTERVAL_INIT() | |
| 20 { | |
| 21 char *envp; | |
| 22 ULONG timerFreq; | |
| 23 APIRET rc; | |
| 24 | |
| 25 if ((envp = getenv("NSPR_OS2_NO_HIRES_TIMER")) != NULL) { | |
| 26 if (atoi(envp) == 1) | |
| 27 return; | |
| 28 } | |
| 29 | |
| 30 timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */ | |
| 31 rc = DosTmrQueryFreq(&timerFreq); | |
| 32 if (NO_ERROR == rc) { | |
| 33 useHighResTimer = PR_TRUE; | |
| 34 PR_ASSERT(timerFreq != 0); | |
| 35 while (timerFreq > PR_INTERVAL_MAX) { | |
| 36 timerFreq >>= 1; | |
| 37 _os2_bitShift++; | |
| 38 _os2_highMask = (_os2_highMask << 1)+1; | |
| 39 } | |
| 40 | |
| 41 _os2_ticksPerSec = timerFreq; | |
| 42 PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN); | |
| 43 } | |
| 44 } | |
| 45 | |
| 46 PRIntervalTime | |
| 47 _PR_MD_GET_INTERVAL() | |
| 48 { | |
| 49 if (useHighResTimer) { | |
| 50 QWORD timestamp; | |
| 51 PRInt32 top; | |
| 52 APIRET rc = DosTmrQueryTime(×tamp); | |
| 53 if (NO_ERROR != rc) { | |
| 54 return -1; | |
| 55 } | |
| 56 /* Sadly, nspr requires the interval to range from 1000 ticks per | |
| 57 * second to only 100000 ticks per second. DosTmrQueryTime is too | |
| 58 * high resolution... | |
| 59 */ | |
| 60 top = timestamp.ulHi & _os2_highMask; | |
| 61 top = top << (32 - _os2_bitShift); | |
| 62 timestamp.ulLo = timestamp.ulLo >> _os2_bitShift; | |
| 63 timestamp.ulLo = timestamp.ulLo + top; | |
| 64 return (PRUint32)timestamp.ulLo; | |
| 65 } else { | |
| 66 ULONG msCount = -1; | |
| 67 DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount)); | |
| 68 return msCount; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 PRIntervalTime | |
| 73 _PR_MD_INTERVAL_PER_SEC() | |
| 74 { | |
| 75 if (useHighResTimer) { | |
| 76 return _os2_ticksPerSec; | |
| 77 } else { | |
| 78 return 1000; | |
| 79 } | |
| 80 } |
