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87 lines
1.5 KiB
87 lines
1.5 KiB
#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_HPP_INCLUDED |
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#define BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_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/smart_ptr/detail/yield_k.hpp> |
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#if defined( __ia64__ ) && defined( __INTEL_COMPILER ) |
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# include <ia64intrin.h> |
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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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int v_; |
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public: |
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bool try_lock() |
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{ |
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int r = __sync_lock_test_and_set( &v_, 1 ); |
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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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__sync_lock_release( &v_ ); |
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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_SYNC_HPP_INCLUDED
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