#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <limits.h>
#include <stdbool.h>

#define N 50
//#define SHOW_DETAILS

pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;

void* access_res(void* args) {
  int id = *(int*)args;
  *(int*)args = 0;

  for (int i=0; i < INT_MAX; i++) {
    pthread_mutex_lock(&lock);
    *(int*)args += 1;
    pthread_mutex_unlock(&lock);
  }
  *(int*)args = -1;

  return NULL;
}

int main() {
  pthread_t tid[N];
  int args[N]; // Reuse it for the number of accesses

  for (int i=0; i < N; i++) {
    args[i] = i;
    pthread_create(&(tid[i]), NULL, &access_res, (void*)&(args[i]));
  }

  bool is_end = false;
  while (!is_end) {
    #ifdef SHOW_DETAILS
      printf("Accesses:\n");
    #endif
    int max, min, avg;
    max = avg = 0;
    min = INT_MAX;
    for (int i=0; i < N; i++) {
      #ifdef SHOW_DETAILS
        printf("%d ", args[i]);
      #endif
      if (args[i] == -1)
        is_end = true;

      if (args[i] > max)
        max = args[i];
  
      if (args[i] < min)
        min = args[i];

      avg += args[i]/N;
    }
    #ifdef SHOW_DETAILS
      printf("\n");
    #endif
    printf("min max avg : %d %d %d\n", min, max, avg);
    sleep(1);
  }

  for (int i=0; i < N; i++) {
    pthread_join(tid[i], NULL);
  }
}