Function qpid_proton_sys::pn_link_advance

pub unsafe extern "C" fn pn_link_advance(link: *mut pn_link_t) -> bool

Advance the current delivery of a link to the next delivery on the link. For sending links this operation is used to finish sending message data for the current outgoing delivery and move on to the next outgoing delivery (if any). For receiving links, this operation is used to finish accessing message data from the current incoming delivery and move on to the next incoming delivery (if any). Each link maintains a sequence of deliveries in the order they were created, along with a pointer to the current delivery. The pn_link_advance operation will modify the current delivery on the link to point to the next delivery in the sequence. If there is no next delivery in the sequence, the current delivery will be set to NULL. This operation will return true if invoking it caused the value of the current delivery to change, even if it was set to NULL.