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

void *thread_functionA(void *arg){
		int i; double x=(((float)rand())/RAND_MAX)*1e6; usleep(x);  
		printf("Sono il threadA ! \n");	return NULL;	}
void *thread_functionB(void *arg){
		int i; double x=(((float)rand())/RAND_MAX)*1e6; usleep(x);  
		printf("Sono il threadB ! \n");	return NULL;	}
void *thread_functionC(void *arg){
		int i; double x=(((float)rand())/RAND_MAX)*1e6; usleep(x);
		printf("Sono il threadC ! \n");	return NULL;	}
void *thread_functionD(void *arg){
		int i; double x=(((float)rand())/RAND_MAX)*1e6; usleep(x);  
		printf("Sono il threadD ! \n");	return NULL;	}
void *thread_functionE(void *arg){
		int i; double x=(((float)rand())/RAND_MAX)*1e6; usleep(x);
		printf("Sono il threadE ! \n");	return NULL;	}
void *thread_functionF(void *arg){
		int i; double x=(((float)rand())/RAND_MAX)*1e6; usleep(x);
		printf("Sono il threadF ! \n");	return NULL;	}

int main(void) {
	srand(time(0));
  	pthread_t mythreadA, mythreadB, mythreadC, mythreadD, mythreadE, mythreadF;

  	pthread_create( &mythreadA, NULL, thread_functionA, NULL); pthread_join ( mythreadA, NULL );
  	pthread_create( &mythreadB, NULL, thread_functionB, NULL);
  	pthread_create( &mythreadC, NULL, thread_functionC, NULL); pthread_join ( mythreadC, NULL );
   	pthread_create( &mythreadD, NULL, thread_functionD, NULL);
  	pthread_create( &mythreadE, NULL, thread_functionE, NULL);
	pthread_join ( mythreadB, NULL ); pthread_join ( mythreadD, NULL ); pthread_join ( mythreadE, NULL );
    	pthread_create( &mythreadF, NULL, thread_functionF, NULL); pthread_join ( mythreadF, NULL );
  	exit(0);
}