CS471/571 - Operating Systems

Displaying exercises/e5/files/e5.c

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

#define DATASIZE 100 * 1024 * 1024

long value;
unsigned char *data;

/**
 * Compile with gcc -o e5 e5.c -lm
 */

void compute_value(void)
{
  for(int i=0; i < DATASIZE; i++)
    value += (long)cos(sqrt((double)data[i]));
}

int main(int argc, char *argv[])
{
  /* Leave the following unmodified: */
  if (argc > 1) srand(atoi(argv[1]));
  value = 0;
  data = malloc(sizeof(unsigned char) * DATASIZE);

  printf("Generating data...\n");
  for(int i=0; i < DATASIZE; i++) {
    data[i] = (unsigned char)(rand() % 100);
  }

  /* Add thread support from here: */
  printf("Computing...\n");
  compute_value();

  printf("%ld\n", value);
  return 0;
}