#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
void *thread_function1(void *arg){
		int i; double x;
		for( i=0; i<5; i++) {
			x=(((float)rand())/RAND_MAX)*1e6;	usleep(x);  
			printf(" Sono il thread1 con ID=%lu! \n", pthread_self());
		}
  		return NULL;
}
void *thread_function2(void *arg){
		int i; double x;
		for( i=0; i<5; i++) {
			x=(((float)rand())/RAND_MAX)*1e6;	usleep(x);
			printf("\tSono il thread2 con ID=%lu! \n", pthread_self());
    		}
  		return NULL;
}
int main(void) {
	srand(time(0));
  	pthread_t mythread1, mythread2;
  	if ( pthread_create( &mythread1, NULL, thread_function1, NULL) ) {
    		printf("errore di creazione thread.");    abort();
  	}
  	if ( pthread_create( &mythread2, NULL, thread_function2, NULL) ) {
    		printf("errore di creazione thread.");    abort();
  	}
  	if ( pthread_join ( mythread1, NULL ) ) {
    		printf("errore di sincronizzazione thread.");    abort();
  	}
  	if ( pthread_join ( mythread2, NULL ) ) {
    		printf("errore di sincronizzazione thread.");    abort();
  	}
  	exit(0);
}