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