/*
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Duke University
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE TRUSTEES AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE TRUSTEES OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */



#ifndef RTIMER_H
#define RTIMER_H


#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>

typedef struct {
  struct rusage rut1, rut2; /* used to get user and system time */
  struct timeval tv1, tv2; /* used to get wall time */

  double tw_usec; /* total wall time in microseconds */
  double tu_usec; /* total user time */
  double ts_usec; /* total system time */
} Rtimer;


/* not required to be called, but makes values print as 0.
   obviously a hack */
#define rt_zero(rt) bzero(&(rt),sizeof(Rtimer));
	

/* update start time value in rt1 and tv1 */
#define rt_start(rt)				     \
  if((getrusage(RUSAGE_SELF, &rt.rut1) < 0)	     \
	 || (gettimeofday(&(rt.tv1), NULL) < 0)) {   \
	perror("rusage/gettimeofday");		     \
	exit(1);				     \
  }


/* updates end time value in rt2;  */
#define rt_stop(rt)                                     \
  if((getrusage(RUSAGE_SELF, &rt.rut2) < 0)		\
	 || (gettimeofday(&(rt.tv2), NULL) < 0)) {	\
    perror("rusage/gettimeofday");			\
    exit(1);						\
  }



/* updates end time value in rt2; add the current timings to the total times  */
#define rt_stop_and_accumulate(rt)                                     \
  if((getrusage(RUSAGE_SELF, &rt.rut2) < 0)			       \
     || (gettimeofday(&(rt.tv2), NULL) < 0)) {			       \
    perror("rusage/gettimeofday");				       \
    exit(1);							       \
  };								       \
  rt.tw_usec += (((double)rt.tv2.tv_usec +				\
		  (double)rt.tv2.tv_sec*1000000)			\
		 - ((double)rt.tv1.tv_usec +				\
		    (double)rt.tv1.tv_sec*1000000));			\
  rt.tu_usec +=  (((double)rt.rut2.ru_utime.tv_usec +			\
		   (double)rt.rut2.ru_utime.tv_sec*1000000)		\
		  - ((double)rt.rut1.ru_utime.tv_usec +			\
		     (double)rt.rut1.ru_utime.tv_sec*1000000));		\
  rt.ts_usec += (((double)rt.rut2.ru_stime.tv_usec +			\
		  (double)rt.rut2.ru_stime.tv_sec*1000000)		\
		 - ((double)rt.rut1.ru_stime.tv_usec +			\
		    (double)rt.rut1.ru_stime.tv_sec*1000000));





#define rt_u_useconds(rt)						\
  (((double)rt.rut2.ru_utime.tv_usec +					\
    (double)rt.rut2.ru_utime.tv_sec*1000000)				\
   - ((double)rt.rut1.ru_utime.tv_usec +				\
      (double)rt.rut1.ru_utime.tv_sec*1000000))

#define rt_s_useconds(rt)					\
  (((double)rt.rut2.ru_stime.tv_usec +				\
    (double)rt.rut2.ru_stime.tv_sec*1000000)			\
   - ((double)rt.rut1.ru_stime.tv_usec +			\
      (double)rt.rut1.ru_stime.tv_sec*1000000))

#define rt_w_useconds(rt)				\
  (((double)rt.tv2.tv_usec +				\
    (double)rt.tv2.tv_sec*1000000)			\
   - ((double)rt.tv1.tv_usec +				\
      (double)rt.tv1.tv_sec*1000000))

#define rt_seconds(rt) (rt_w_useconds(rt)/1000000)

#define rt_sprint(buf, rt) rt_sprint_safe(buf,rt)

#define rt_total(buf, rt) rt_sprint_total(buf, rt)


char* rt_sprint(char *buf, Rtimer rt);

char* rt_sprint_average(char *buf, Rtimer rt, int k);

/* to be called after rt_stop_and_accumulate to print the total time */
char* rt_sprint_total(char* buf, Rtimer rt);

#endif /* RTIMER_H */