/* This function must be called with the IOLock held. */
unsigned int xcb_get_request_sent(xcb_connection_t *c);
-pthread_mutex_t *xcb_get_io_lock(xcb_connection_t *c);
-
void xcb_xlib_lock(xcb_connection_t *c);
void xcb_xlib_unlock(xcb_connection_t *c);