timing.c

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#ifndef _WIN32
 
#include        <sys/types.h>
#include        <sys/times.h>
#include        <sys/param.h>
 
 
 
#ifndef HZ
#define HZ 60
#endif
typedef struct tms mytime_t;
#define GET_TIME(S) times(&(S))
#define DIFF_IN_SECS(S,T) ((S.tms_utime + S.tms_stime - T.tms_utime - T.tms_stime)/(double)HZ)
 
#else
 
#include        <time.h>
 
typedef clock_t mytime_t;
#define GET_TIME(S) S = clock()
#define DIFF_IN_SECS(S,T) ((S - T) / (double)CLOCKS_PER_SEC)
 
#endif
 
#include <common/types.h>
#include <common/utils.h>
 
static mytime_t T;
 
void start_timer(void)
{
    GET_TIME(T);
}
 
double elapsed_sec(void)
{
    mytime_t S;
    double rv;
 
    GET_TIME(S);
    rv = DIFF_IN_SECS(S, T);
    return rv;
}