Preparation for session thread safety overhaul:

 - simplified SessionState, responsibility for protocol states now in Handlers
 - qpid::RefCounted, qpid::intrusive_ptr reference counting support.
 - build boost unit tests as single exe, speeds up testing.
 - fixed leak in AsynchIOAcceptor.cpp


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@590869 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 73 insertions, 0 deletions

diff --git a/cpp/src/qpid/RefCounted.h b/cpp/src/qpid/RefCounted.h
new file mode 100644
index 0000000000..790076b463
--- /dev/null
+++ b/cpp/src/qpid/RefCounted.h
@@ -0,0 +1,73 @@
+#ifndef QPID_REFCOUNTED_H
+#define QPID_REFCOUNTED_H
+
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+#include "qpid/sys/AtomicCount.h"
+
+#include <boost/intrusive_ptr.hpp>
+
+
+namespace qpid {
+
+/** Abstract interface for reference counted objects */
+class AbstractRefCounted {
+  public:
+    virtual void addRef() const=0;
+    virtual void release() const=0;
+  protected:
+    virtual ~AbstractRefCounted() {}
+};
+
+/**
+ * Reference-counted virtual base class.
+ */
+class RefCounted : public AbstractRefCounted
+{
+  public:
+    RefCounted() {}
+    virtual void addRef() const { ++count; }
+    virtual void release() const { if (--count==0) released(); }
+
+  protected:
+    virtual ~RefCounted() {};
+    // Copy/assign do not copy refcounts. 
+    RefCounted(const RefCounted&) : AbstractRefCounted() {}
+    RefCounted& operator=(const RefCounted&) { return *this; }
+    virtual void released() const { delete this; }
+
+  private:
+    mutable sys::AtomicCount count;
+};
+
+using boost::intrusive_ptr;
+
+} // namespace qpid
+
+// intrusive_ptr support.
+namespace boost {
+void intrusive_ptr_add_ref(const qpid::AbstractRefCounted* p) { p->addRef(); }
+void intrusive_ptr_release(const qpid::AbstractRefCounted* p) { p->release(); }
+}
+
+
+#endif  /*!QPID_REFCOUNTED_H*/