Ted Ross created PROTON-39:
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             Summary: 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


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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