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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_REVERSE_LOCK_HPP
+#define BOOST_THREAD_REVERSE_LOCK_HPP
+#include <boost/thread/detail/config.hpp>
+#include <boost/thread/locks.hpp>
+#include <boost/thread/detail/delete.hpp>
+
+namespace boost
+{
+
+ template<typename Lock>
+ class reverse_lock
+ {
+
+ public:
+ typedef typename Lock::mutex_type mutex_type;
+ BOOST_THREAD_NO_COPYABLE(reverse_lock)
+
+ explicit reverse_lock(Lock& m_)
+ : m(m_), mtx(0)
+ {
+ if (m.owns_lock())
+ {
+ m.unlock();
+ }
+ mtx=m.release();
+ }
+ ~reverse_lock()
+ {
+ if (mtx) {
+ mtx->lock();
+ m = BOOST_THREAD_MAKE_RV_REF(Lock(*mtx, adopt_lock));
+ }
+ }
+
+ private:
+ Lock& m;
+ mutex_type* mtx;
+ };
+
+
+#ifdef BOOST_THREAD_NO_AUTO_DETECT_MUTEX_TYPES
+ template<typename T>
+ struct is_mutex_type<reverse_lock<T> >
+ {
+ BOOST_STATIC_CONSTANT(bool, value = true);
+ };
+
+#endif
+
+
+}
+
+#endif // header