Ted Ross updated PROTON-39:

    Attachment: proton-39.patch
> Implement pn_offer for sender links
> -----------------------------------
>                 Key: PROTON-39
>                 URL: https://issues.apache.org/jira/browse/PROTON-39
>             Project: Qpid Proton
>          Issue Type: New Feature
>          Components: proton-c
>            Reporter: Ted Ross
>         Attachments: proton-39.patch
> The proposed patch adds two functions to the engine API:
> void pn_offer(link, credit)
> bool pn_connection_links_writeable(conn)
> pn_offer is used by the attached node to indicate to the engine that it has 
> messages available for immediate transfer over the link.
> pn_connection_links_writable returns true if the connection has at least one 
> outgoing link with both receiver credit and offered credit.  This is used by 
> the driver to ensure that the connection's FD (or equivalent) is in the set 
> of writable FDs to be processed it the outgoing transport is writable.
> Note that pn_offer is absolute (not cumulative).  The attached node is 
> responsible for keeping the offer vaule up-to-date as messages are sent and 
> received.
> The patch does not make any changes to the protocol exchange.  Additional 
> work is needed to communicate the offer information to the remote receiver so 
> the receiver can intelligently manage its credits.
> The driving need for this change is for driver functionality.  pn_offer is 
> the cleanest mechanism for a node to tell the driver that an outbound link's 
> connection should be processed.

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