зеркало из https://github.com/mozilla/gecko-dev.git
Bug 164841: use high performance timers (again) on OS/2.
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443f251af3
Коммит
906d6413eb
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@ -39,22 +39,62 @@
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#include "primpl.h"
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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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void
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_PR_MD_INTERVAL_INIT()
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{
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ULONG timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
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APIRET rc = DosTmrQueryFreq(&timerFreq);
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if (NO_ERROR == rc) {
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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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timerFreq >>= 1;
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_os2_bitShift++;
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_os2_highMask = (_os2_highMask << 1)+1;
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}
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_os2_ticksPerSec = timerFreq;
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PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN);
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}
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}
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PRIntervalTime
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_PR_MD_GET_INTERVAL()
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{
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ULONG msCount = PR_FAILURE;
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DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount));
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return msCount;
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if (useHighResTimer) {
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QWORD timestamp;
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PRInt32 top;
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APIRET rc = DosTmrQueryTime(×tamp);
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if (NO_ERROR != rc) {
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return -1;
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}
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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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* high resolution...
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*/
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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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} else {
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ULONG msCount = -1;
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DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount));
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return msCount;
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}
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}
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PRIntervalTime
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_PR_MD_INTERVAL_PER_SEC()
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{
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return 1000;
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if (useHighResTimer) {
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return _os2_ticksPerSec;
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} else {
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return 1000;
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}
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}
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