the begginning

utils/boost_idb/boost/thread/shared_lock_guard.hpp

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+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+// (C) Copyright 2012 Vicente J. Botet Escriba
+
+#ifndef BOOST_THREAD_SHARED_LOCK_GUARD_HPP
+#define BOOST_THREAD_SHARED_LOCK_GUARD_HPP
+#include <boost/thread/detail/config.hpp>
+//#include <boost/thread/locks.hpp>
+#include <boost/thread/lock_options.hpp>
+#include <boost/thread/detail/delete.hpp>
+
+namespace boost
+{
+
+    template<typename SharedMutex>
+    class shared_lock_guard
+    {
+    private:
+        SharedMutex& m;
+
+    public:
+        typedef SharedMutex mutex_type;
+        BOOST_THREAD_NO_COPYABLE(shared_lock_guard)
+        explicit shared_lock_guard(SharedMutex& m_):
+            m(m_)
+        {
+            m.lock_shared();
+        }
+        shared_lock_guard(SharedMutex& m_,adopt_lock_t):
+            m(m_)
+        {}
+        ~shared_lock_guard()
+        {
+            m.unlock_shared();
+        }
+    };
+
+#ifdef BOOST_THREAD_NO_AUTO_DETECT_MUTEX_TYPES
+
+    template<typename T>
+    struct is_mutex_type<shared_lock_guard<T> >
+    {
+        BOOST_STATIC_CONSTANT(bool, value = true);
+    };
+
+
+#endif
+
+
+}
+
+#endif // header