From 39f068763c649f63f2c42ab19e76d4f76d612ff5 Mon Sep 17 00:00:00 2001
From: Ted Ross <tross@apache.org>
Date: Fri, 13 Jan 2012 16:20:11 +0000
Subject: QPID-3755 - Concurrent queue bind on the same queue results in crash

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1231158 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/broker/QueueBindings.cpp | 10 ++++++++--
 cpp/src/qpid/broker/QueueBindings.h   | 11 ++++++++++-
 2 files changed, 18 insertions(+), 3 deletions(-)

(limited to 'cpp/src')

diff --git a/cpp/src/qpid/broker/QueueBindings.cpp b/cpp/src/qpid/broker/QueueBindings.cpp
index 60d315acfe..c6b3ddf9a9 100644
--- a/cpp/src/qpid/broker/QueueBindings.cpp
+++ b/cpp/src/qpid/broker/QueueBindings.cpp
@@ -30,16 +30,22 @@ using namespace qpid::broker;
 
 void QueueBindings::add(const string& exchange, const string& key, const FieldTable& args)
 {
+    sys::Mutex::ScopedLock l(lock);
     bindings.push_back(QueueBinding(exchange, key, args));
 }
 
 void QueueBindings::unbind(ExchangeRegistry& exchanges, Queue::shared_ptr queue)
 {
-    for (Bindings::iterator i = bindings.begin(); i != bindings.end(); i++) {
+    Bindings local;
+    {
+        sys::Mutex::ScopedLock l(lock);
+        local = bindings;
+    }
+
+    for (Bindings::iterator i = local.begin(); i != local.end(); i++)
         try {
             exchanges.get(i->exchange)->unbind(queue, i->key, &(i->args));
         } catch (const NotFoundException&) {}
-    }
 }
 
 QueueBinding::QueueBinding(const string& _exchange, const string& _key, const FieldTable& _args)
diff --git a/cpp/src/qpid/broker/QueueBindings.h b/cpp/src/qpid/broker/QueueBindings.h
index 1b90ba5540..f9b07e7431 100644
--- a/cpp/src/qpid/broker/QueueBindings.h
+++ b/cpp/src/qpid/broker/QueueBindings.h
@@ -22,6 +22,7 @@
 #define _QueueBindings_
 
 #include "qpid/framing/FieldTable.h"
+#include "qpid/sys/Mutex.h"
 #include <boost/ptr_container/ptr_list.hpp>
 #include <boost/shared_ptr.hpp>
 #include <algorithm>
@@ -44,12 +45,20 @@ class QueueBindings
   public:
     
     /** Apply f to each QueueBinding. */
-    template <class F> void eachBinding(F f) const { std::for_each(bindings.begin(), bindings.end(), f); }
+    template <class F> void eachBinding(F f) const {
+        Bindings local;
+        {
+            sys::Mutex::ScopedLock l(lock);
+            local = bindings;
+        }
+        std::for_each(local.begin(), local.end(), f);
+    }
 
     void add(const std::string& exchange, const std::string& key, const qpid::framing::FieldTable& args);
     void unbind(ExchangeRegistry& exchanges, boost::shared_ptr<Queue> queue);
 
   private:
+    mutable sys::Mutex lock;
     typedef std::vector<QueueBinding> Bindings;
     Bindings bindings;
 };
-- 
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