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113 lines
1.9 KiB
113 lines
1.9 KiB
#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_HPP_INCLUDED |
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#define BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_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/detail/interlocked.hpp> |
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#include <boost/smart_ptr/detail/yield_k.hpp> |
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// BOOST_COMPILER_FENCE |
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#if defined(__INTEL_COMPILER) |
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#define BOOST_COMPILER_FENCE __memory_barrier(); |
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#elif defined( _MSC_VER ) && _MSC_VER >= 1310 |
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extern "C" void _ReadWriteBarrier(); |
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#pragma intrinsic( _ReadWriteBarrier ) |
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#define BOOST_COMPILER_FENCE _ReadWriteBarrier(); |
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#elif defined(__GNUC__) |
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#define BOOST_COMPILER_FENCE __asm__ __volatile__( "" : : : "memory" ); |
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#else |
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#define BOOST_COMPILER_FENCE |
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#endif |
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// |
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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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long v_; |
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public: |
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bool try_lock() |
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{ |
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long r = BOOST_INTERLOCKED_EXCHANGE( &v_, 1 ); |
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BOOST_COMPILER_FENCE |
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return r == 0; |
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} |
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void lock() |
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{ |
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for( unsigned k = 0; !try_lock(); ++k ) |
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{ |
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boost::detail::yield( k ); |
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} |
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} |
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void unlock() |
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{ |
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BOOST_COMPILER_FENCE |
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*const_cast< long volatile* >( &v_ ) = 0; |
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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 {0} |
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_HPP_INCLUDED
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