Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: // (C) Copyright 2012 Vicente J. Botet Escriba
Chris@16: 
Chris@16: #ifndef BOOST_THREAD_REVERSE_LOCK_HPP
Chris@16: #define BOOST_THREAD_REVERSE_LOCK_HPP
Chris@16: #include <boost/thread/detail/config.hpp>
Chris@16: #include <boost/thread/detail/move.hpp>
Chris@16: #include <boost/thread/lockable_traits.hpp>
Chris@16: #include <boost/thread/lock_options.hpp>
Chris@16: #include <boost/thread/detail/delete.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16:     template<typename Lock>
Chris@16:     class reverse_lock
Chris@16:     {
Chris@16:     public:
Chris@16:         typedef typename Lock::mutex_type mutex_type;
Chris@16:         BOOST_THREAD_NO_COPYABLE(reverse_lock)
Chris@16: 
Chris@16:         explicit reverse_lock(Lock& m_)
Chris@16:         : m(m_), mtx(0)
Chris@16:         {
Chris@16:             if (m.owns_lock())
Chris@16:             {
Chris@16:               m.unlock();
Chris@16:             }
Chris@16:             mtx=m.release();
Chris@16:         }
Chris@16:         ~reverse_lock()
Chris@16:         {
Chris@16:           if (mtx) {
Chris@16:             mtx->lock();
Chris@16:             m = BOOST_THREAD_MAKE_RV_REF(Lock(*mtx, adopt_lock));
Chris@16:           }
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:       Lock& m;
Chris@16:       mutex_type* mtx;
Chris@16:     };
Chris@16: 
Chris@16: 
Chris@16: #ifdef BOOST_THREAD_NO_AUTO_DETECT_MUTEX_TYPES
Chris@16:     template<typename T>
Chris@16:     struct is_mutex_type<reverse_lock<T> >
Chris@16:     {
Chris@16:         BOOST_STATIC_CONSTANT(bool, value = true);
Chris@16:     };
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: #endif // header