diff --git a/include/osg/OperationsThread b/include/osg/OperationsThread
index ad4b16b8b..154419d10 100644
--- a/include/osg/OperationsThread
+++ b/include/osg/OperationsThread
@@ -11,8 +11,8 @@
  * OpenSceneGraph Public License for more details.
 */
 
-#ifndef OSG_OPERATIONSTHREAD
-#define OSG_OPERATIONSTHREAD 1
+#ifndef OSG_OPERATIONTHREAD
+#define OSG_OPERATIONTHREAD 1
 
 #include <osg/observer_ptr>
 #include <osg/Object>
@@ -23,6 +23,7 @@
 #include <OpenThreads/Block>
 
 #include <list>
+#include <set>
 
 namespace osg {
 
@@ -71,6 +72,8 @@ class Operation : virtual public Referenced
         bool        _keep;
 };
 
+class OperationThread;
+
 class OSG_EXPORT OperationQueue : public Referenced
 {
     public:
@@ -103,25 +106,35 @@ class OSG_EXPORT OperationQueue : public Referenced
         /** Release operations block that is used to block threads that are waiting on an empty operations queue.*/
         void releaseOperationsBlock();
 
+        typedef std::set<OperationThread*> OperationThreads;
+        
+        /** Get the set of OperationThreads that are sharing this OperationQueue. */
+        const OperationThreads& getOperationThreads() const { return _operationThreads; }
 
     protected:
 
         virtual ~OperationQueue();
 
-        typedef std::list< ref_ptr<Operation> > Operations;
+        friend class OperationThread;
+        
+        void addOperationThread(OperationThread* thread);
+        void removeOperationThread(OperationThread* thread);
+        
+        typedef std::list< osg::ref_ptr<Operation> > Operations;
 
         OpenThreads::Mutex          _operationsMutex;
         osg::ref_ptr<osg::RefBlock> _operationsBlock;
         Operations                  _operations;
         Operations::iterator        _currentOperationIterator;
 
+        OperationThreads            _operationThreads;
 };
 
 /** GraphicsThread is a helper class for running OpenGL GraphicsOperation within a single thread assigned to a specific GraphicsContext.*/
-class OSG_EXPORT OperationsThread : public Referenced, public OpenThreads::Thread
+class OSG_EXPORT OperationThread : public Referenced, public OpenThreads::Thread
 {
     public:
-        OperationsThread();
+        OperationThread();
 
         void setParent(Object* parent) { _parent = parent; }
 
@@ -169,7 +182,7 @@ class OSG_EXPORT OperationsThread : public Referenced, public OpenThreads::Threa
 
     protected:
     
-        virtual ~OperationsThread();
+        virtual ~OperationThread();
         
         observer_ptr<Object>            _parent;
 
@@ -181,6 +194,8 @@ class OSG_EXPORT OperationsThread : public Referenced, public OpenThreads::Threa
 
 };
 
+typedef OperationThread OperationsThread;
+
 }
 
 #endif
diff --git a/src/osg/OperationsThread.cpp b/src/osg/OperationsThread.cpp
index 0b22b1ab3..c44048d45 100644
--- a/src/osg/OperationsThread.cpp
+++ b/src/osg/OperationsThread.cpp
@@ -199,20 +199,30 @@ void OperationQueue::releaseOperationsBlock()
 }
 
 
+void OperationQueue::addOperationThread(OperationThread* thread)
+{
+    _operationThreads.insert(thread);
+}
+
+void OperationQueue::removeOperationThread(OperationThread* thread)
+{
+    _operationThreads.erase(thread);
+}
+
 /////////////////////////////////////////////////////////////////////////////
 //
-//  OperationsThread
+//  OperationThread
 //
 
-OperationsThread::OperationsThread():
+OperationThread::OperationThread():
     osg::Referenced(true),
     _parent(0),
     _done(false)
 {
-    _operationQueue = new OperationQueue;
+    setOperationQueue(new OperationQueue);
 }
 
-OperationsThread::~OperationsThread()
+OperationThread::~OperationThread()
 {
     //osg::notify(osg::NOTICE)<<"Destructing graphics thread "<<this<<std::endl;
 
@@ -221,13 +231,20 @@ OperationsThread::~OperationsThread()
     //osg::notify(osg::NOTICE)<<"Done Destructing graphics thread "<<this<<std::endl;
 }
 
-void OperationsThread::setOperationQueue(OperationQueue* opq)
+void OperationThread::setOperationQueue(OperationQueue* opq)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_threadMutex);
+
+    if (_operationQueue == opq) return;
+
+    if (_operationQueue.valid()) _operationQueue->removeOperationThread(this);
+
     _operationQueue = opq;
+
+    if (_operationQueue.valid()) _operationQueue->addOperationThread(this);
 }
 
-void OperationsThread::setDone(bool done)
+void OperationThread::setDone(bool done)
 {
     if (_done==done) return;
 
@@ -250,9 +267,9 @@ void OperationsThread::setDone(bool done)
     }
 }
 
-int OperationsThread::cancel()
+int OperationThread::cancel()
 {
-    osg::notify(osg::INFO)<<"Cancelling OperationsThread "<<this<<" isRunning()="<<isRunning()<<std::endl;
+    osg::notify(osg::INFO)<<"Cancelling OperationThread "<<this<<" isRunning()="<<isRunning()<<std::endl;
 
     int result = 0;
     if( isRunning() )
@@ -293,42 +310,42 @@ int OperationsThread::cancel()
 #endif
             // commenting out debug info as it was cashing crash on exit, presumable
             // due to osg::notify or std::cout destructing earlier than this destructor.
-            osg::notify(osg::INFO)<<"   Waiting for OperationsThread to cancel "<<this<<std::endl;
+            osg::notify(osg::INFO)<<"   Waiting for OperationThread to cancel "<<this<<std::endl;
             OpenThreads::Thread::YieldCurrentThread();
         }
     }
 
-    osg::notify(osg::INFO)<<"  OperationsThread::cancel() thread cancelled "<<this<<" isRunning()="<<isRunning()<<std::endl;
+    osg::notify(osg::INFO)<<"  OperationThread::cancel() thread cancelled "<<this<<" isRunning()="<<isRunning()<<std::endl;
 
     return result;
 }
 
-void OperationsThread::add(Operation* operation)
+void OperationThread::add(Operation* operation)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_threadMutex);
     if (!_operationQueue) _operationQueue = new OperationQueue;
     _operationQueue->add(operation);
 }
 
-void OperationsThread::remove(Operation* operation)
+void OperationThread::remove(Operation* operation)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_threadMutex);
     if (_operationQueue.valid()) _operationQueue->remove(operation);
 }
 
-void OperationsThread::remove(const std::string& name)
+void OperationThread::remove(const std::string& name)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_threadMutex);
     if (_operationQueue.valid()) _operationQueue->remove(name);
 }
 
-void OperationsThread::removeAllOperations()
+void OperationThread::removeAllOperations()
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_threadMutex);
     if (_operationQueue.valid()) _operationQueue->removeAllOperations();
 }
 
-void OperationsThread::run()
+void OperationThread::run()
 {
     // make the graphics context current.
     GraphicsContext* graphicsContext = dynamic_cast<GraphicsContext*>(_parent.get());