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

  #define MAX_NUM 5

int sum = 0;

pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;

void * f(void * a) {
  int k = * (int * ) a;

  srand(time(NULL));

  while (sum < 1000) {
    int n = rand() % 10;
    pthread_mutex_lock( & mtx);
    if (sum < 1000) {
      sum += n;
      if (sum >= 1000) {
        printf("Thread-ul %d a realizat trecerea", k);
      }
    }
    pthread_mutex_unlock( & mtx);
  }

  return NULL;
}

int main(int argc, char * argv[]) {
  pthread_t t[MAX_NUM];

  int index[MAX_NUM];
  for (int k = 0; k < MAX_NUM; k++) {
    index[k] = k;
  }
  int i;
  for (i = 0; i < MAX_NUM; i++) {
    pthread_create( & t[i], NULL, f, & index[i]);
  }

  for (i = 0; i < MAX_NUM; i++) {
    pthread_join(t[i], NULL);
  }

  return 0;
}