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

#define NUM_THREADS 10

// Exercise 2 variables
pthread_mutex_t counter_lock = PTHREAD_MUTEX_INITIALIZER;
int global_counter = 0;

// Exercise 3 variables
pthread_mutex_t print_order_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t evens_done_CV = PTHREAD_COND_INITIALIZER;
int number_evens_finished = 0;

void *sayHello(void *temp_id) {
  int i;
  int global_counter_copy;
  int id = (long) temp_id; // store a casted version to avoid some compiler warnings

  printf("Hello! I am thread id %d!\n",id);
  for(i=0; i < 1000000; i++) {
  }

  global_counter_copy = global_counter; 

  printf("Bye! I am thread id %d and I was #%d to print!\n",id,global_counter_copy);

  for(i=0; i < 1000000; i++) {
  }
  global_counter = global_counter_copy+1;
  pthread_exit(NULL);
}

int main(void) {
  int ii;
  pthread_t threads[NUM_THREADS];
  
  printf("Hello, I am the main thread just starting\n");
  // create threads  
  for(ii = 0; ii < NUM_THREADS; ii++) {
    // for the first part of Exercise 1
    // YOUR FIRST LINE OF CODE HERE
  }
    // for the second part of Exercise 1
    // JOIN THREADS HERE

  printf("Main thread saying goodbye!\n");
}