From c1ceb35c3d386e6bae5bc4dafd4e635805a97451 Mon Sep 17 00:00:00 2001
From: Andrew Stitcher <astitcher@apache.org>
Date: Tue, 12 Oct 2010 16:04:35 +0000
Subject: Make sure that Rdma::Listener can generate no more callbacks after it
 receives a disconnected event for a connection id.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1021818 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/sys/rdma/RdmaIO.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'cpp/src')

diff --git a/cpp/src/qpid/sys/rdma/RdmaIO.cpp b/cpp/src/qpid/sys/rdma/RdmaIO.cpp
index d5f2816818..fe7062d3ea 100644
--- a/cpp/src/qpid/sys/rdma/RdmaIO.cpp
+++ b/cpp/src/qpid/sys/rdma/RdmaIO.cpp
@@ -564,6 +564,10 @@ namespace Rdma {
         ci->listen();
     }
 
+    namespace {
+        const int64_t PoisonContext = -1;
+    }
+
     void Listener::connectionEvent(Connection::intrusive_ptr ci) {
         ConnectionEvent e(ci->getNextEvent());
 
@@ -578,6 +582,11 @@ namespace Rdma {
         ::rdma_conn_param conn_param = e.getConnectionParam();
         Rdma::Connection::intrusive_ptr id = e.getConnection();
 
+        // Check for previous disconnection (it appears that you actually can get connection
+        // request events after a disconnect event in rare circumstances)
+        if (reinterpret_cast<int64_t>(id->getContext<void*>())==PoisonContext)
+            return;
+
         switch (eventType) {
         case RDMA_CM_EVENT_CONNECT_REQUEST: {
             // Make sure peer has sent params we can use
@@ -612,6 +621,9 @@ namespace Rdma {
             break;
         case RDMA_CM_EVENT_DISCONNECTED:
             disconnectedCallback(id);
+            // Poison the id context so that we do no more callbacks on it
+            id->removeContext();
+            id->addContext(reinterpret_cast<void*>(PoisonContext));
             break;
         case RDMA_CM_EVENT_CONNECT_ERROR:
             errorCallback(id, CONNECT_ERROR);
-- 
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