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

#define WORK_SIZE 50000
float dest[WORK_SIZE];
int num_threads;

// naive exponentiation is useful because it requires a lot of compute
int power(int a, int b) {
  int i;
  int r = a;
  for (i = 1; i < b; i++) r = r * a;
  return r;
}

void* calc_powers(void* arg) {
  int start = *((int* )arg);
  int i = start*(WORK_SIZE/num_threads);
  for (int offset = 0 ; offset < WORK_SIZE/num_threads; offset++) {
    dest[i + offset] = power(i + offset, i + offset);
  }
}

int main(int argc, char** argv){
  num_threads = 4;

  pthread_t threads[num_threads];

  int starts[num_threads];

  for(int i = 0; i < num_threads; i++){
    starts[i] = i;
    pthread_create(&threads[i], NULL, &calc_powers, &starts[i]);
  }

  for(int i = 0; i < num_threads; i++)
    pthread_join(threads[i], NULL);

  printf("All done!\n");

}