/*       AAAA    CCCC   OOOO   TTTTTT   SSSSS  PPPPP      AA  AA  CC     OO  OO    TT    SS      PP  PP      AAAAAA  CC     OO  OO    TT     SSSS   PPPPP      AA  AA  CC     OO  OO    TT        SS  PP      AA  AA   CCCC   OOOO     TT    SSSSS   PP################################################################    ACO algorithms for the TSP    ################################################################      Version: 1.0      File:    times.c      Author:  Thomas Stuetzle      Purpose: routines for measuring elapsed time (CPU or real)      Check:   README.txt and legal.txt*/#include <stdio.h>//#include <sys/time.h>//#include <sys/resource.h>#include "timer.h"static struct rusage res;static struct timeval tp;static double virtual_time, real_time;void start_timers()/*          FUNCTION:       virtual and real time of day are computed and stored to                       allow at later time the computation of the elapsed time 		      (virtual or real)       INPUT:          none      OUTPUT:         none      (SIDE)EFFECTS:  virtual and real time are computed   */{    getrusage( RUSAGE_SELF, &res );    virtual_time = (double) res.ru_utime.tv_sec +		   (double) res.ru_stime.tv_sec +		   (double) res.ru_utime.tv_usec / 1000000.0 +		   (double) res.ru_stime.tv_usec / 1000000.0;    gettimeofday( &tp, NULL );    real_time =    (double) tp.tv_sec +		   (double) tp.tv_usec / 1000000.0;}double elapsed_time( type )	TIMER_TYPE type;/*          FUNCTION:       return the time used in seconds (virtual or real, depending on type)       INPUT:          TIMER_TYPE (virtual or real time)      OUTPUT:         seconds since last call to start_timers (virtual or real)      (SIDE)EFFECTS:  none*/{    if (type == REAL) {        gettimeofday( &tp, NULL );        return( (double) tp.tv_sec +		(double) tp.tv_usec / 1000000.0		- real_time );    }    else {        getrusage( RUSAGE_SELF, &res );        return( (double) res.ru_utime.tv_sec +		(double) res.ru_stime.tv_sec +		(double) res.ru_utime.tv_usec / 1000000.0 +		(double) res.ru_stime.tv_usec / 1000000.0		- virtual_time );    }}