// Pthreads example code
// compile with: gcc -Wall pthreads_example.c -o pthreads_example -lpthread
// execute with: ./pthreads_example (or "time ./pthreads_example")


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

void thread_func (int num)
{
  long long i,j;

  printf("Thread %d executing.\n", num);
  j = 0;
  for (i=0; i < 700000000U; ++i){
    ++j;
  }
  printf("Thread %d done (%lld).\n", num, j);
}

int main ()
{
  pthread_t thread1, thread2;
  pthread_t thread3, thread4;

  pthread_create(&thread1, NULL, (void *) &thread_func, (void *) 1);
  pthread_create(&thread2, NULL, (void *) &thread_func, (void *) 2);
  pthread_create(&thread3, NULL, (void *) &thread_func, (void *) 3);
  pthread_create(&thread4, NULL, (void *) &thread_func, (void *) 4);

  pthread_join(thread1, NULL);
  pthread_join(thread2, NULL);
  pthread_join(thread3, NULL);
  pthread_join(thread4, NULL);

  return 0;

}