timer.c

/*
 * Copyright (c) 2017, Los Alamos National Security, LLC.
 * All rights Reserved.
 * 
 * This is the code released under LANL Copyright Disclosure C17041/LA-CC-17-041
 * Copyright 2017.  Los Alamos National Security, LLC. This material was produced
 * under U.S. Government contract DE-AC52-06NA25396 for Los Alamos National
 * Laboratory (LANL), which is operated by Los Alamos National Security, LLC
 * for the U.S. Department of Energy. See LICENSE file for details.
 *
 * Released under the New BSD License
 *
 * Bob Robey brobey@lanl.gov and Rao Garimella rao@lanl.gov
 */

#include <sys/time.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>

#include "timer.h"

void cpu_timer_start(struct timeval *tstart_cpu){
   gettimeofday(tstart_cpu, NULL);
}

double cpu_timer_stop(struct timeval tstart_cpu){
   double result;
   struct timeval tstop_cpu, tresult;

   gettimeofday(&tstop_cpu, NULL);
   tresult.tv_sec = tstop_cpu.tv_sec - tstart_cpu.tv_sec;
   tresult.tv_usec = tstop_cpu.tv_usec - tstart_cpu.tv_usec;
   result = (double)tresult.tv_sec + (double)tresult.tv_usec*1.0e-6;
   return(result);
}