Function apr_queue_push 

pub unsafe extern "C" fn apr_queue_push(
    queue: *mut apr_queue_t,
    data: *mut c_void,
) -> apr_status_t

push/add an object to the queue, blocking if the queue is already full

@param queue the queue @param data the data @returns APR_EINTR the blocking was interrupted (try again) @returns APR_EOF the queue has been terminated @returns APR_SUCCESS on a successful push