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author | Remko Tronçon <git@el-tramo.be> | 2010-03-28 15:46:49 (GMT) |
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committer | Remko Tronçon <git@el-tramo.be> | 2010-03-28 15:46:49 (GMT) |
commit | f53a1ef582494458301b97bf6e546be52d7ff7e8 (patch) | |
tree | 7571b5cbcbd8a8f1dd1c966c9045b6cb69f0e295 /3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp | |
parent | 638345680d72ca6acaf123f2c8c1c391f696e371 (diff) | |
download | swift-contrib-f53a1ef582494458301b97bf6e546be52d7ff7e8.zip swift-contrib-f53a1ef582494458301b97bf6e546be52d7ff7e8.tar.bz2 |
Moving submodule contents back.
Diffstat (limited to '3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp b/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp new file mode 100644 index 0000000..5c44d7c --- /dev/null +++ b/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp @@ -0,0 +1,77 @@ +#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_X86_HPP_INCLUDED +#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_X86_HPP_INCLUDED + +// +// boost/detail/atomic_count_gcc_x86.hpp +// +// atomic_count for g++ on 486+/AMD64 +// +// Copyright 2007 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) +// + +namespace boost +{ + +namespace detail +{ + +class atomic_count +{ +public: + + explicit atomic_count( long v ) : value_( static_cast< int >( v ) ) {} + + long operator++() + { + return atomic_exchange_and_add( &value_, +1 ) + 1; + } + + long operator--() + { + return atomic_exchange_and_add( &value_, -1 ) - 1; + } + + operator long() const + { + return atomic_exchange_and_add( &value_, 0 ); + } + +private: + + atomic_count(atomic_count const &); + atomic_count & operator=(atomic_count const &); + + mutable int value_; + +private: + + static int atomic_exchange_and_add( int * pw, int dv ) + { + // int r = *pw; + // *pw += dv; + // return r; + + int r; + + __asm__ __volatile__ + ( + "lock\n\t" + "xadd %1, %0": + "+m"( *pw ), "=r"( r ): // outputs (%0, %1) + "1"( dv ): // inputs (%2 == %1) + "memory", "cc" // clobbers + ); + + return r; + } +}; + +} // namespace detail + +} // namespace boost + +#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_X86_HPP_INCLUDED |