Function soft_reset

backend/usb-libusb.c:2024–2087

 */

static void
soft_reset(void)
{
  fd_set	  input_set;		/* Input set for select() */
  struct timeval  tv;			/* Time value */
  char		  buffer[2048];		/* Buffer */
  struct timespec cond_timeout;		/* pthread condition timeout */


 /*
  * Send an abort once a second until the I/O lock is released by the main
  * thread...
  */

  pthread_mutex_lock(&g.readwrite_lock_mutex);
  while (g.readwrite_lock)
  {
    gettimeofday(&tv, NULL);
    cond_timeout.tv_sec  = tv.tv_sec + 1;
    cond_timeout.tv_nsec = tv.tv_usec * 1000;

    while (g.readwrite_lock)
    {
      if (pthread_cond_timedwait(&g.readwrite_lock_cond,
				 &g.readwrite_lock_mutex,
				 &cond_timeout) != 0)
	break;
    }
  }

  g.readwrite_lock = 1;
  pthread_mutex_unlock(&g.readwrite_lock_mutex);

 /*
  * Flush bytes waiting on print_fd...
  */

  g.print_bytes = 0;

  FD_ZERO(&input_set);
  FD_SET(g.print_fd, &input_set);

  tv.tv_sec  = 0;
  tv.tv_usec = 0;

  while (select(g.print_fd+1, &input_set, NULL, NULL, &tv) > 0)
    if (read(g.print_fd, buffer, sizeof(buffer)) <= 0)
      break;

 /*
  * Send the reset...
  */

  soft_reset_printer(g.printer);

 /*
  * Release the I/O lock...
  */