Linux get time sample, using CLOCK_MONOTONIC_RAW

linux clock.cpp

/**
* Created by Zaxuhe
**/
#include <iostream>
#include <time.h>

#define SEC2NANO 1000000000.0f

using namespace std;

int main()
{
    timespec ts;
    timespec ts2;
    cout << "Hello world!" << endl;

    clock_gettime(CLOCK_MONOTONIC_RAW,&ts);
    double v1 = ts.tv_nsec ;
    double v2 = ts.tv_sec ;
    std::cout << ts.tv_nsec << std::endl;
    std::cout << ts.tv_sec << std::endl;
    usleep(400000);
    clock_gettime(CLOCK_MONOTONIC_RAW,&ts2);
    std::cout << ts2.tv_nsec << std::endl;
    std::cout << ts2.tv_sec << std::endl;
    v1 = ts2.tv_nsec - v1;
    v2 = ts2.tv_sec - v2;
    //std::cout << v2*SEC2NANO+v1 << std::endl;

    long long totaltime = ((ts2.tv_sec*SEC2NANO + ts2.tv_nsec) - (ts.tv_sec*SEC2NANO + ts.tv_nsec));
    std::cout << totaltime/SEC2NANO << std::endl;


    return 0;
}

CLOCK_MONOTONIC_RAW is specified in linux, can use CLOCK_MONOTONIC instead in Windows or lower version linux.