HW12/timerhelper.h

#ifndef _TIMERHELPER_H_
#define _TIMERHELPER_H_
#include <sys/time.h>

#ifndef __always_inline
#define __always_inline
#endif

__always_inline struct timespec timespec_sub(struct timespec a,struct timespec b){
    struct timespec ret;
    ret.tv_sec = a.tv_sec - b.tv_sec;
    ret.tv_nsec = a.tv_nsec - b.tv_nsec;
    if (ret.tv_nsec < 0){
        ret.tv_sec--;
        ret.tv_nsec += 1000000000L;
    }
    return ret;
}

#endif