suite/tests/client-interface/pcache.c

/* **********************************************************
 * Copyright (c) 2012 Google, Inc.  All rights reserved.
 * **********************************************************/

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#include "tools.h"

/* adapted from suite/tests/pthreads/pthreads.c just to do some work */

#include <stdio.h>
#include <stdlib.h>

double pi = 0.0;  /* Approximation to pi (shared) */
double intervals; /* How many intervals? */

void
do_some_work(int start)
{
    register double width, localsum;
    register int i;

    /* Set width */
    width = 1.0 / intervals;

    /* Do the local computation */
    localsum = 0;
    for (i=start; i<intervals; i+=2) {
        register double x = (i + 0.5) * width;
        localsum += 4.0 / (1.0 + x * x);
    }
    localsum *= width;

    pi += localsum;

    return;
}

int
main(int argc, char **argv)
{
    intervals = 10;
    do_some_work(0);
    do_some_work(1);
    print("Estimation of pi is %16.15f\n", pi);
    return 0;
}