tread

#include <stdio.h>
#include <curses.h>
#include <stdlib.h>
#include <unistd.h>
#define MAXX 80 /* Numero di colonne dello schermo */
#define MAXY 24 /* Numero di righe dello schermo */
#define PASSO 1
#define SPEED 500000
#define N 2

struct pos {
    char c;
    int x; /* coordinata x */
    int y; /* coordinata y */
};

void* print_xs (void* parameters){
    int r;
    int dx, dy;
    struct pos* p;

    p = (struct pos*) parameters;

    while (1){
        r=random();
        if(r<RAND_MAX/2)
            dx=PASSO;
        else
            dx=-PASSO;
        if(p->x+dx<1 || p->x+dx>=MAXX)
            dx=-dx;
        p->x+=dx;

        r=random();
        if(r<RAND_MAX/2)
            dy=PASSO;
        else
            dy=-PASSO;
        if(p->y+dy<1 || p->y+dy>=MAXY)
            dy=-dy;
        p->y+=dy;

        mvaddch(p->y,p->x,p->c);
        refresh();
        usleep(SPEED);
        mvaddch(p->y,p->x,' ');
    }

    return NULL;
}

int main () {
        pthread_t thread1_id;
        struct pos thread1_args;

        initscr();
        noecho();
        curs_set(0);

        thread1_args.c = random();
        thread1_args.x = random()%MAXX;
        thread1_args.y = random()%MAXY;

        pthread_create (&thread1_id, NULL, &print_xs, &thread1_args);
        pthread_join (thread1_id, NULL);

        endwin();
        return 0;

}