1 files changed, 74 insertions, 0 deletions
diff --git a/Final/cpp/lib/common/sys/AtomicCount.h b/Final/cpp/lib/common/sys/AtomicCount.h
new file mode 100644
index 0000000000..b3d099192f
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+++ b/Final/cpp/lib/common/sys/AtomicCount.h
@@ -0,0 +1,74 @@
+#ifndef _posix_AtomicCount_h
+#define _posix_AtomicCount_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 <boost/detail/atomic_count.hpp>
+#include <boost/noncopyable.hpp>
+
+namespace qpid {
+namespace sys {
+
+/**
+ * Atomic counter.
+ */
+class AtomicCount : boost::noncopyable {
+  public:
+    class ScopedDecrement : boost::noncopyable {
+      public:
+        /** Decrement counter in constructor and increment in destructor. */
+        ScopedDecrement(AtomicCount& c) : count(c) { value = --count; }
+        ~ScopedDecrement() { ++count; }
+        /** Return the value returned by the decrement. */
+        operator long() { return value; }
+      private:
+        AtomicCount& count;
+        long value;
+    };
+
+    class ScopedIncrement : boost::noncopyable {
+      public:
+        /** Increment counter in constructor and increment in destructor. */
+        ScopedIncrement(AtomicCount& c) : count(c) { ++count; }
+        ~ScopedIncrement() { --count; }
+      private:
+        AtomicCount& count;
+    };
+
+    AtomicCount(long value = 0) : count(value) {}
+    
+    void operator++() { ++count ; }
+    
+    long operator--() { return --count; }
+    
+    operator long() const { return count; }
+
+    
+  private:
+    boost::detail::atomic_count  count;
+};
+
+
+}}
+
+
+#endif // _posix_AtomicCount_h