Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Is it safe to assume that the count returned from QueryPerformanceCounter relates to the time since the last system boot? Or could it be reset while the system is running? The MSDN article itself doesn’t guarantee this, however I’ve seen some 3rd party information (such as this) that says that this is the case.
It’s meant to be used for relative times. But I don’t think it can be used to measure time since boot.
From what I hear, it’s implemented using the
rdtscinstruction which measures “pseudo” CPU cycles since the CPU was powered on. In that case, yes, it probably does give the time since boot, but I don’t think this is specified.