while (i < 1000) { FD_ZERO(&rfds); FD_SET(fd0, &rfds); FD_SET(fd1, &rfds); tv.tv_sec = 0; tv.tv_usec = 250000; retval = select(FD_SETSIZE, &rfds, NULL, NULL, &tv); if (retval > 0) { if (FD_ISSET(fd0, &rfds)) { n = read(fd0, buf, BUFSIZE - 1); buf[n] = 0; printf("FIFO 1: %s\n",buf); }if (FD_ISSET(fd1, &rfds)) { n = read(fd1, buf, BUFSIZE - 1); buf[n] = 0; printf("FIFO 2: %s\n",buf); }if (!(swap % 20)) { msg.task = hello_thread?0:1; msg.command = HELLO; write(ctl, &msg, sizeof(msg)); msg.task = hello_thread?1:0; msg.command = WORLD; write(ctl, &msg, sizeof(msg)); hello_thread = hello_thread?0:1; }swap++; i++; } }