forked from boostorg/smart_ptr
97 lines
1.6 KiB
C++
97 lines
1.6 KiB
C++
#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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//
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// Copyright (c) 2008 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See 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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//
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#include <boost/assert.hpp>
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#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
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#include <boost/config/pragma_message.hpp>
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BOOST_PRAGMA_MESSAGE("Using single-threaded spinlock emulation")
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#endif
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namespace boost
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{
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namespace detail
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{
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class spinlock
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{
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public:
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bool locked_;
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public:
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inline bool try_lock()
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{
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if( locked_ )
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{
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return false;
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}
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else
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{
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locked_ = true;
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return true;
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}
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}
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inline void lock()
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{
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BOOST_ASSERT( !locked_ );
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locked_ = true;
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}
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inline void unlock()
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{
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BOOST_ASSERT( locked_ );
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locked_ = false;
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}
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public:
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class scoped_lock
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{
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private:
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spinlock & sp_;
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scoped_lock( scoped_lock const & );
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scoped_lock & operator=( scoped_lock const & );
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public:
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explicit scoped_lock( spinlock & sp ): sp_( sp )
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{
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sp.lock();
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}
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~scoped_lock()
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{
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sp_.unlock();
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}
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};
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};
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} // namespace detail
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} // namespace boost
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#define BOOST_DETAIL_SPINLOCK_INIT { false }
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED
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