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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
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