source: src/benchmark/ThrdCtxSwitch.c @ e2ef6bf

#include <fstream>
#include <stdlib>
#include <thread>

#include <unistd.h>                                     // sysconf
#include <sys/times.h>                                  // times
#include <time.h>

inline unsigned long long int Time() {
    timespec ts;
    clock_gettime(
#if defined( __linux__ )
         CLOCK_THREAD_CPUTIME_ID,
#elif defined( __freebsd__ )
         CLOCK_PROF,
#elif defined( __solaris__ )
         CLOCK_HIGHRES,
#else
    #error uC++ : internal error, unsupported architecture
#endif
         &ts );
    return 1000000000LL * ts.tv_sec + ts.tv_nsec;
} // Time
 
#ifndef N
#define N 100000000
#endif

int main() {
        const unsigned int NoOfTimes = N;
        long long int StartTime, EndTime;

        StartTime = Time();
        for ( volatile unsigned int i = 0; i < NoOfTimes; i += 1 ) {
                yield();
        }
        EndTime = Time();

        sout | ( EndTime - StartTime ) / NoOfTimes | endl;
}