/**** This is a include file to be included as #include "timer.h" in
your code. it defines to procedural macros starttimer and stoptimer
to be used in code as explained in the handout ***/

#include<time.h>
#include<sys/time.h>
#include<sys/resource.h>


extern struct rusage timestuff;
extern double dtime;
extern long time1, time2;
extern double precondtime, conjgradtime;

#define starttimer getrusage(RUSAGE_SELF,&timestuff); \
time1 = timestuff.ru_utime.tv_sec; time2 = timestuff.ru_utime.tv_usec

#define stoptimer getrusage(RUSAGE_SELF,&timestuff); \
time1 -=timestuff.ru_utime.tv_sec; time2 -= timestuff.ru_utime.tv_usec; \
dtime -= (time2 + 1.0e6 * time1); \
dtime /= 1.0e6