From c04659aff9662296e2fa4ce58b03a926acaf493a Mon Sep 17 00:00:00 2001
From: Gordon Sim <gsim@apache.org>
Date: Thu, 18 Aug 2011 16:09:03 +0000
Subject: QPID-3435: Revised strategy for closing senders/receivers to prevent
 possible infinite loop

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1159293 13f79535-47bb-0310-9956-ffa450edef68
---
 qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.cpp | 38 +++++++++++++----------
 1 file changed, 21 insertions(+), 17 deletions(-)

(limited to 'qpid/cpp')

diff --git a/qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.cpp b/qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.cpp
index e6255dcd6f..be5eab1f2b 100644
--- a/qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.cpp
+++ b/qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.cpp
@@ -60,12 +60,14 @@ SessionImpl::SessionImpl(ConnectionImpl& c, bool t) : connection(&c), transactio
 
 void SessionImpl::checkError()
 {
+    ScopedLock l(lock);
     qpid::client::SessionBase_0_10Access s(session);
     s.get()->assertOpen();
 }
 
 bool SessionImpl::hasError()
 {
+    ScopedLock l(lock);
     qpid::client::SessionBase_0_10Access s(session);
     return s.get()->hasError();
 }
@@ -129,27 +131,29 @@ void SessionImpl::close()
         senders.clear();
         receivers.clear();
     } else {
-        while (true) {
-            Sender s;
-            {
-                ScopedLock l(lock);
-                if (senders.empty()) break;
-                s = senders.begin()->second;
-            }
-            s.close();  // outside the lock, will call senderCancelled
+        Senders sCopy;
+        Receivers rCopy;
+        {
+            ScopedLock l(lock);
+            senders.swap(sCopy);
+            receivers.swap(rCopy);
         }
-        while (true) {
-            Receiver r;
-            {
-                ScopedLock l(lock);
-                if (receivers.empty()) break;
-                r = receivers.begin()->second;
-            }
-            r.close();  // outside the lock, will call receiverCancelled
+        for (Senders::iterator i = sCopy.begin(); i != sCopy.end(); ++i)
+        {
+            // outside the lock, will call senderCancelled
+            i->second.close();
+        }
+        for (Receivers::iterator i = rCopy.begin(); i != rCopy.end(); ++i)
+        {
+            // outside the lock, will call receiverCancelled
+            i->second.close();
         }
     }
     connection->closed(*this);
-    if (!hasError()) session.close();
+    if (!hasError()) {
+        ScopedLock l(lock);
+        session.close();
+    }
 }
 
 template <class T, class S> boost::intrusive_ptr<S> getImplPtr(T& t)
-- 
cgit v1.2.1