| #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_HPP_INCLUDED |
| #define BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_HPP_INCLUDED |
| |
| // MS compatible compilers support #pragma once |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| # pragma once |
| #endif |
| |
| // |
| // Copyright (c) 2008 Peter Dimov |
| // |
| // 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) |
| // |
| |
| #include <boost/smart_ptr/detail/yield_k.hpp> |
| |
| #if defined( __ia64__ ) && defined( __INTEL_COMPILER ) |
| # include <ia64intrin.h> |
| #endif |
| |
| namespace boost |
| { |
| |
| namespace detail |
| { |
| |
| class spinlock |
| { |
| public: |
| |
| int v_; |
| |
| public: |
| |
| bool try_lock() |
| { |
| int r = __sync_lock_test_and_set( &v_, 1 ); |
| return r == 0; |
| } |
| |
| void lock() |
| { |
| for( unsigned k = 0; !try_lock(); ++k ) |
| { |
| boost::detail::yield( k ); |
| } |
| } |
| |
| void unlock() |
| { |
| __sync_lock_release( &v_ ); |
| } |
| |
| public: |
| |
| class scoped_lock |
| { |
| private: |
| |
| spinlock & sp_; |
| |
| scoped_lock( scoped_lock const & ); |
| scoped_lock & operator=( scoped_lock const & ); |
| |
| public: |
| |
| explicit scoped_lock( spinlock & sp ): sp_( sp ) |
| { |
| sp.lock(); |
| } |
| |
| ~scoped_lock() |
| { |
| sp_.unlock(); |
| } |
| }; |
| }; |
| |
| } // namespace detail |
| } // namespace boost |
| |
| #define BOOST_DETAIL_SPINLOCK_INIT {0} |
| |
| #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_HPP_INCLUDED |