유닉스 작업 시간 측정 (마이크로세컨드)

struct timeval fstart_time, fend_time;

char ftime[10];

long fstime, fetime, frtime, fsec, fusec;

gettimeofday(&fstart_time, NULL);

memset(ftime,0,sizeof(ftime));

===========================작업=============================

 gettimeofday(&fend_time, NULL);
 

    fstime = fstart_time. tv_sec * 1000000 + fstart_time.tv_usec;

    fetime = fend_time.tv_sec* 1000000 + fend_time.tv_usec;

    frtime = fetime - fstime;

    if(frtime>=1000000)

    {

    fsec = frtime / 1000000;

    fusec = frtime - ((frtime / 1000000)*1000000);

    }

    else

    {

    fsec = 0;

    fusec = frtime;

    }

    sprintf(ftime,"%ld.%06ld",fsec, fusec);