kgiusti commented on a change in pull request #693: DISPATCH-1579: open
dedicated inter-router sessions for data and control links
URL: https://github.com/apache/qpid-dispatch/pull/693#discussion_r389859457
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File path: src/router_node.c
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@@ -786,18 +786,47 @@ static int AMQP_link_attach_handler(void* context,
qd_link_t *link)
/**
- * Handler for flow events on links
+ * Handler for flow events on links. Flow updates include session window
+ * state, which needs to be checked for unblocking Q3.
*/
static int AMQP_link_flow_handler(void* context, qd_link_t *link)
{
- qd_router_t *router = (qd_router_t*) context;
- qdr_link_t *rlink = (qdr_link_t*) qd_link_get_context(link);
- pn_link_t *pnlink = qd_link_pn(link);
-
- if (!rlink)
- return 0;
+ qd_router_t *router = (qd_router_t*) context;
+ pn_link_t *pnlink = qd_link_pn(link);
+ pn_session_t *pn_ssn = pn_link_session(pnlink);
+
+ bool link_flowed = false;
+ if (pn_ssn) {
+ qd_session_t *qd_ssn = pn_session_get_context(pn_ssn);
+ if (qd_ssn && qd_session_is_q3_blocked(qd_ssn)) {
+ // Q3 blocked - have we drained enough outgoing bytes?
+ const size_t q3_lower = BUFFER_SIZE * QD_QLIMIT_Q3_LOWER;
Review comment:
This is tricky - BUFFER_SIZE is actually a variable not a constant. The
unit tests modify it to test various buffer sizes. I can compute it at startup
after the buffer code is done initializing.
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