What's the difference between clock(), gettickcount(), QueryPerformanceCounter() and QueryPerformanceFrequency()?

Question

Do they all give millisecond resolution?

Answer 1

clock

A C++ function. It returns the number of CPU ticks since the application is started. To convert this into seconds divide it by CLOCKS_PER_SEC.

GetTickCount

A Win32 API function. Returns the number of milliseconds since the system was started.

QueryPerformanceCounter

A Win32 API function. The performance counter is a high-resolution counter which increases over time. To convert this into seconds divide it by QueryPerformanceFrequency.