private double Measure()
{
var systemTime = CpuUsageNativeApi.GetSystemTime();
var usedTime = getCurrentUsedTime();
if (isFirstMeasure)
{
sysTimePrev = systemTime;
usedTimePrev = usedTime;
isFirstMeasure = false;
return(0);
}
var sysDelta = systemTime - sysTimePrev;
var usedDelta = usedTime - usedTimePrev;
sysTimePrev = systemTime;
usedTimePrev = usedTime;
var usage = sysDelta <= 0
? 0
: Math.Max(0, Math.Min(1, usedDelta / (double)sysDelta));
return(usage);
}
/// <summary>
/// Creates <see cref="ProcessCpuUsageMeter"/> for specified process.
/// </summary>
public ProcessCpuUsageMeter(int pid)
{
handle = ProcessUtility.OpenLimitedQueryInformationProcessHandle(pid);
cpuUsageMeter = new CpuUsageMeter(() => CpuUsageNativeApi.GetProcessTime(handle));
}