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[SIGAR-119] Use 64-bit performance counter for uptime

This commit is contained in:
Doug MacEachern 2008-09-08 23:15:56 +00:00
parent 0cbf1411d2
commit 5c905c8e64
1 changed files with 33 additions and 2 deletions
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33
src/os/win32/win32_sigar.c
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@ -29,6 +29,7 @@
#define PERFBUF_SIZE 8192
#define PERF_TITLE_PROC 230
#define PERF_TITLE_SYS_KEY "2"
#define PERF_TITLE_MEM_KEY "4"
#define PERF_TITLE_PROC_KEY "230"
#define PERF_TITLE_CPU_KEY "238"
@ -975,11 +976,41 @@ SIGAR_DECLARE(int) sigar_cpu_list_get(sigar_t *sigar,
}
}
#define PERF_TITLE_UPTIME_KEY 674 /* System Up Time */
SIGAR_DECLARE(int) sigar_uptime_get(sigar_t *sigar,
sigar_uptime_t *uptime)
{
uptime->uptime = GetTickCount() / 1000;
int status;
PERF_OBJECT_TYPE *object =
get_perf_object_inst(sigar, PERF_TITLE_SYS_KEY, 0, &status);
PERF_INSTANCE_DEFINITION *inst;
PERF_COUNTER_DEFINITION *counter;
BYTE *data;
DWORD i;
if (!object) {
return status;
}
data = (BYTE *)((BYTE *)object + object->DefinitionLength);
for (i=0, counter = PdhFirstCounter(object);
i<object->NumCounters;
i++, counter = PdhNextCounter(counter))
{
if (counter->CounterNameTitleIndex == PERF_TITLE_UPTIME_KEY) {
DWORD offset = counter->CounterOffset;
LONGLONG time = object->PerfTime.QuadPart;
LONGLONG freq = object->PerfFreq.QuadPart;
LONGLONG counter = *((LONGLONG *)(data + offset));
uptime->uptime = (time - counter) / freq;
return SIGAR_OK;
}
}
/* http://msdn.microsoft.com/en-us/library/ms724408.aspx */
return GetTickCount() / 1000;
}
/*