Function QueryPerformanceFrequency [src]

Prototype

pub fn QueryPerformanceFrequency() u64

Source

  pub fn QueryPerformanceFrequency() u64 {
    // "On systems that run Windows XP or later, the function will always succeed"
    // https://docs.microsoft.com/en-us/windows/desktop/api/profileapi/nf-profileapi-queryperformancefrequency
    var result: LARGE_INTEGER = undefined;
    assert(ntdll.RtlQueryPerformanceFrequency(&result) != 0);
    // The kernel treats this integer as unsigned.
    return @as(u64, @bitCast(result));
}  