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win: use performance counter instead of GetTickCount for uptime

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Brian White 2012-02-24 11:56:15 -05:00 committed by Bert Belder
parent b309f2e2e6
commit 442aa1f469
1 changed files with 64 additions and 2 deletions
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66
src/win/util.c
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@ -385,8 +385,70 @@ uv_err_t uv_resident_set_memory(size_t* rss) {
uv_err_t uv_uptime(double* uptime) {
*uptime = (double)GetTickCount()/1000.0;
return uv_ok_;
uv_err_t err;
PERF_DATA_BLOCK *dataBlock = NULL;
PERF_OBJECT_TYPE *objType;
PERF_COUNTER_DEFINITION *counterDef;
PERF_COUNTER_DEFINITION *counterDefUptime = NULL;
DWORD dataSize = 4096;
DWORD getSize;
LONG lError = ERROR_MORE_DATA;
uint64_t upsec;
unsigned int i;
BYTE *counterData;
*uptime = 0;
while (lError == ERROR_MORE_DATA) {
if (dataBlock) {
free(dataBlock);
}
dataBlock = (PERF_DATA_BLOCK*)malloc(dataSize);
if (!dataBlock) {
uv_fatal_error(ERROR_OUTOFMEMORY, "malloc");
}
getSize = dataSize;
lError = RegQueryValueExW(HKEY_PERFORMANCE_DATA, "2", NULL, NULL,
(BYTE*)dataBlock, &getSize);
if (lError != ERROR_SUCCESS && getSize > 0) {
if (wcsncmp(dataBlock->Signature, "PERF", 4) == 0) {
break;
}
} else if (lError != ERROR_SUCCESS && lError != ERROR_MORE_DATA) {
err = uv__new_sys_error(GetLastError());
goto done;
}
dataSize += 1024;
}
RegCloseKey(HKEY_PERFORMANCE_DATA);
objType = (PERF_OBJECT_TYPE*)((BYTE*)dataBlock + dataBlock->HeaderLength);
counterDef = (PERF_COUNTER_DEFINITION*)((BYTE*)objType + objType->HeaderLength);
for (i = 0; i < objType->NumCounters; ++i) {
if (counterDef->CounterNameTitleIndex == 674) {
counterDefUptime = counterDef;
break;
}
counterDef = (PERF_COUNTER_DEFINITION*)((BYTE*)counterDef + counterDef->ByteLength);
}
counterData = (BYTE*)objType + objType->DefinitionLength;
counterData += counterDefUptime->CounterOffset;
upsec = *((uint64_t*)counterData);
*uptime = ((objType->PerfTime.QuadPart - upsec) / objType->PerfFreq.QuadPart);
err = uv_ok_;
done:
if (dataBlock) {
free(dataBlock);
}
return err;
}