#include <stdio.h>
#include <pthread.h>
pthread_t main_id, mythread_id;

void *body(void *arg)
{
  	int p = *(int *)arg;
  	printf("mythread: parameter=%d\n", p);  mythread_id = pthread_self();
  	printf("mythread: main_id==mythread_id:%d\n", pthread_equal(main_id,mythread_id) );
  	return (void *)5678;
}

int main()
{
  	pthread_t mythread;
  	pthread_attr_t myattr;
  	int err;
  	int parameter= 1234;
  	void *returnvalue;
  
  	pthread_attr_init(&myattr);     
	main_id = pthread_self();
 	puts("main: before pthread_create\n"); 
  	err = pthread_create(&mythread, &myattr, body, (void *)&parameter);
  	puts("main: dopo la creazione del thread\n");
  
  	pthread_attr_destroy(&myattr);
  
  	pthread_join(mythread, &returnvalue);
  	printf("main: ritorna %d\n", (int)returnvalue);
  	return 0;
}