util/system/hp_timer.h


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#pragma once

#include "defaults.h"

namespace NHPTimer {
    using STime = i64;
    // May delay for ~50ms to compute frequency
    double GetSeconds(const STime& a) noexcept;
    // Returns the current time
    void GetTime(STime* pTime) noexcept;
    // Returns the time passed since *pTime, and writes the current time into *pTime.
    double GetTimePassed(STime* pTime) noexcept;
    // Get TSC frequency, may delay for ~50ms to compute frequency
    double GetClockRate() noexcept;
    // same as GetClockRate, but in integer
    ui64 GetCyclesPerSecond() noexcept;
} 
 
struct THPTimer { 
    THPTimer() noexcept {
        Reset(); 
    } 
    void Reset() noexcept {
        NHPTimer::GetTime(&Start); 
    } 
    double Passed() const noexcept {
        NHPTimer::STime tmp = Start; 
        return NHPTimer::GetTimePassed(&tmp); 
    } 
    double PassedReset() noexcept {
        return NHPTimer::GetTimePassed(&Start); 
    } 

private: 
    NHPTimer::STime Start; 
};