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author | Remko Tronçon <git@el-tramo.be> | 2009-06-01 08:48:42 (GMT) |
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committer | Remko Tronçon <git@el-tramo.be> | 2009-06-01 09:24:28 (GMT) |
commit | 2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch) | |
tree | d46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/smart_ptr/detail/spinlock_gcc_arm.hpp | |
download | swift-2812bddd81f8a1b804c7460f4e14cd0aa393d129.zip swift-2812bddd81f8a1b804c7460f4e14cd0aa393d129.tar.bz2 |
Import.
Diffstat (limited to '3rdParty/Boost/boost/smart_ptr/detail/spinlock_gcc_arm.hpp')
-rw-r--r-- | 3rdParty/Boost/boost/smart_ptr/detail/spinlock_gcc_arm.hpp | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/3rdParty/Boost/boost/smart_ptr/detail/spinlock_gcc_arm.hpp b/3rdParty/Boost/boost/smart_ptr/detail/spinlock_gcc_arm.hpp new file mode 100644 index 0000000..ba6c511 --- /dev/null +++ b/3rdParty/Boost/boost/smart_ptr/detail/spinlock_gcc_arm.hpp @@ -0,0 +1,85 @@ +#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED +#define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED + +// +// 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> + +namespace boost +{ + +namespace detail +{ + +class spinlock +{ +public: + + int v_; + +public: + + bool try_lock() + { + int r; + + __asm__ __volatile__( + "swp %0, %1, [%2]": + "=&r"( r ): // outputs + "r"( 1 ), "r"( &v_ ): // inputs + "memory", "cc" ); + + return r == 0; + } + + void lock() + { + for( unsigned k = 0; !try_lock(); ++k ) + { + boost::detail::yield( k ); + } + } + + void unlock() + { + __asm__ __volatile__( "" ::: "memory" ); + *const_cast< int 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_GCC_ARM_HPP_INCLUDED |