/*C
 *
 * Copyright (c) 1999-2001 Duke University --
 * Laura Toma and Rajiv Wickremesinghe
 *
 * 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.
 *C*/



#ifndef RTIMER_H
#define RTIMER_H

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


/* set the times to zero */
#define rt_init(rt) \
  rt.tw_usec = rt.ts_usec = rt.tu_usec = 0;



/* 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);								\
  }									
  /* rt.tw_usec = rt.ts_usec = rt.tu_usec = 0; */



/* updates end time value in rt2 and tv2 and sets  the total time;  */
#define rt_stop(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));



/* added so that the user can accumulate timings.  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));






/* print time */
#define rt_sprint(buf, rt) rt_sprint_safe(buf,rt)
char* rt_sprint_safe(char *buf, Rtimer rt);

/* prints  time/k */
#define rt_sprint_average(buf, rt, k) rt_sprint_safe_average(buf,rt,k)
char* rt_sprint_safe_average(char *buf, Rtimer rt, int k);





/* ************************************************** */
/* ***** now probably redundant ****** */


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


#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)

#endif /* RTIMER_H */