Function xcb::ffi::base::xcb_prefetch_maximum_request_length

pub unsafe extern "C" fn xcb_prefetch_maximum_request_length(
    c: *mut xcb_connection_t
)

Prefetch the maximum request length without blocking.

Without blocking, does as much work as possible toward computing the maximum request length accepted by the X server.

Invoking this function may cause a call to xcb_big_requests_enable, but will not block waiting for the reply. xcb_get_maximum_request_length will return the prefetched data after possibly blocking while the reply is retrieved.

Note that in order for this function to be fully non-blocking, the application must previously have called xcb_prefetch_extension_data(c, &xcb_big_requests_id) and the reply must have already arrived.