Add some thread classes and fix SharedData with a simple mutex adapter

beast/thread/SharedLockGuard.h

@@ -0,0 +1,52 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_THREAD_SHAREDLOCKGUARD_H_INCLUDED
+#define BEAST_THREAD_SHAREDLOCKGUARD_H_INCLUDED
+
+#include "../Uncopyable.h"
+
+namespace beast
+{
+
+/** A scoped container that acquires a shared lock. */   
+template <typename Mutex>
+class SharedLockGuard : public Uncopyable
+{
+public:
+    typedef Mutex MutexType;
+
+    explicit SharedLockGuard (Mutex const& mutex)
+        : m_mutex (mutex)
+    {
+        m_mutex.lock_shared();
+    }
+
+    ~SharedLockGuard ()
+    {
+        m_mutex.unlock_shared();
+    }
+
+private:
+    Mutex const& m_mutex;
+};
+
+}
+
+#endif