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Diffstat (limited to '3rdParty/Boost/src/boost/smart_ptr/detail/spinlock_w32.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/smart_ptr/detail/spinlock_w32.hpp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/smart_ptr/detail/spinlock_w32.hpp b/3rdParty/Boost/src/boost/smart_ptr/detail/spinlock_w32.hpp new file mode 100644 index 0000000..fb97629 --- /dev/null +++ b/3rdParty/Boost/src/boost/smart_ptr/detail/spinlock_w32.hpp @@ -0,0 +1,113 @@ +#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_HPP_INCLUDED +#define BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_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/detail/interlocked.hpp> +#include <boost/smart_ptr/detail/yield_k.hpp> + +// BOOST_COMPILER_FENCE + +#if defined(__INTEL_COMPILER) + +#define BOOST_COMPILER_FENCE __memory_barrier(); + +#elif defined( _MSC_VER ) && _MSC_VER >= 1310 + +extern "C" void _ReadWriteBarrier(); +#pragma intrinsic( _ReadWriteBarrier ) + +#define BOOST_COMPILER_FENCE _ReadWriteBarrier(); + +#elif defined(__GNUC__) + +#define BOOST_COMPILER_FENCE __asm__ __volatile__( "" : : : "memory" ); + +#else + +#define BOOST_COMPILER_FENCE + +#endif + +// + +namespace boost +{ + +namespace detail +{ + +class spinlock +{ +public: + + long v_; + +public: + + bool try_lock() + { + long r = BOOST_INTERLOCKED_EXCHANGE( &v_, 1 ); + + BOOST_COMPILER_FENCE + + return r == 0; + } + + void lock() + { + for( unsigned k = 0; !try_lock(); ++k ) + { + boost::detail::yield( k ); + } + } + + void unlock() + { + BOOST_COMPILER_FENCE + *const_cast< long volatile* >( &v_ ) = 0; + } + +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_W32_HPP_INCLUDED |