diff options
| -rw-r--r-- | unix/tclUnixTime.c | 2 | ||||
| -rw-r--r-- | win/tclWinTime.c | 60 |
2 files changed, 40 insertions, 22 deletions
diff --git a/unix/tclUnixTime.c b/unix/tclUnixTime.c index df759d8..d634449 100644 --- a/unix/tclUnixTime.c +++ b/unix/tclUnixTime.c @@ -158,7 +158,7 @@ TclpGetWideClicks(void) Tcl_Time time; tclGetTimeProcPtr(&time, tclTimeClientData); - now = (Tcl_WideInt) (time.sec*1000000 + time.usec); + now = ((Tcl_WideInt)time.sec)*1000000 + time.usec; } else { #ifdef MAC_OSX_TCL now = (Tcl_WideInt) (mach_absolute_time() & INT64_MAX); diff --git a/win/tclWinTime.c b/win/tclWinTime.c index 71a0366..81d9458 100644 --- a/win/tclWinTime.c +++ b/win/tclWinTime.c @@ -281,8 +281,6 @@ NativeGetTime( ClientData clientData) { struct _timeb t; - int useFtime = 1; /* Flag == TRUE if we need to fall back on - * ftime rather than using the perf counter. */ /* * Initialize static storage on the first trip through. @@ -398,6 +396,10 @@ NativeGetTime( * time. */ + ULARGE_INTEGER fileTimeLastCall; + LARGE_INTEGER perfCounterLastCall, curCounterFreq; + /* Copy with current data of calibration cycle */ + LARGE_INTEGER curCounter; /* Current performance counter. */ Tcl_WideInt curFileTime;/* Current estimated time, expressed as 100-ns @@ -411,9 +413,29 @@ NativeGetTime( posixEpoch.LowPart = 0xD53E8000; posixEpoch.HighPart = 0x019DB1DE; + QueryPerformanceCounter(&curCounter); + + /* + * Hold time section locked as short as possible + */ EnterCriticalSection(&timeInfo.cs); - QueryPerformanceCounter(&curCounter); + fileTimeLastCall.QuadPart = timeInfo.fileTimeLastCall.QuadPart; + perfCounterLastCall.QuadPart = timeInfo.perfCounterLastCall.QuadPart; + curCounterFreq.QuadPart = timeInfo.curCounterFreq.QuadPart; + + LeaveCriticalSection(&timeInfo.cs); + + /* + * If calibration cycle occurred after we get curCounter + */ + if (curCounter.QuadPart <= perfCounterLastCall.QuadPart) { + usecSincePosixEpoch = + (fileTimeLastCall.QuadPart - posixEpoch.QuadPart) / 10; + timePtr->sec = (long) (usecSincePosixEpoch / 1000000); + timePtr->usec = (unsigned long) (usecSincePosixEpoch % 1000000); + return; + } /* * If it appears to be more than 1.1 seconds since the last trip @@ -425,31 +447,27 @@ NativeGetTime( * loop should recover. */ - if (curCounter.QuadPart - timeInfo.perfCounterLastCall.QuadPart < - 11 * timeInfo.curCounterFreq.QuadPart / 10) { - curFileTime = timeInfo.fileTimeLastCall.QuadPart + - ((curCounter.QuadPart - timeInfo.perfCounterLastCall.QuadPart) - * 10000000 / timeInfo.curCounterFreq.QuadPart); - timeInfo.fileTimeLastCall.QuadPart = curFileTime; - timeInfo.perfCounterLastCall.QuadPart = curCounter.QuadPart; + if (curCounter.QuadPart - perfCounterLastCall.QuadPart < + 11 * curCounterFreq.QuadPart / 10 + ) { + curFileTime = fileTimeLastCall.QuadPart + + ((curCounter.QuadPart - perfCounterLastCall.QuadPart) + * 10000000 / curCounterFreq.QuadPart); + usecSincePosixEpoch = (curFileTime - posixEpoch.QuadPart) / 10; timePtr->sec = (long) (usecSincePosixEpoch / 1000000); timePtr->usec = (unsigned long) (usecSincePosixEpoch % 1000000); - useFtime = 0; + return; } - - LeaveCriticalSection(&timeInfo.cs); } - if (useFtime) { - /* - * High resolution timer is not available. Just use ftime. - */ + /* + * High resolution timer is not available. Just use ftime. + */ - _ftime(&t); - timePtr->sec = (long)t.time; - timePtr->usec = t.millitm * 1000; - } + _ftime(&t); + timePtr->sec = (long)t.time; + timePtr->usec = t.millitm * 1000; } /* |