| 1 | #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_ATOMIC_HPP_INCLUDED |
| 2 | #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_ATOMIC_HPP_INCLUDED |
| 3 | |
| 4 | // boost/detail/atomic_count_gcc_atomic.hpp |
| 5 | // |
| 6 | // atomic_count for g++ 4.7+ |
| 7 | // |
| 8 | // Copyright 2007, 2020 Peter Dimov |
| 9 | // |
| 10 | // Distributed under the Boost Software License, Version 1.0. |
| 11 | // https://www.boost.org/LICENSE_1_0.txt |
| 12 | |
| 13 | #include <boost/cstdint.hpp> |
| 14 | |
| 15 | #if defined(BOOST_SP_REPORT_IMPLEMENTATION) |
| 16 | |
| 17 | #include <boost/config/pragma_message.hpp> |
| 18 | BOOST_PRAGMA_MESSAGE("Using __atomic atomic_count" ) |
| 19 | |
| 20 | #endif |
| 21 | |
| 22 | namespace boost |
| 23 | { |
| 24 | |
| 25 | namespace detail |
| 26 | { |
| 27 | |
| 28 | class atomic_count |
| 29 | { |
| 30 | public: |
| 31 | |
| 32 | explicit atomic_count( long v ): value_( static_cast< boost::int_least32_t >( v ) ) |
| 33 | { |
| 34 | } |
| 35 | |
| 36 | long operator++() |
| 37 | { |
| 38 | return __atomic_add_fetch( &value_, +1, __ATOMIC_ACQ_REL ); |
| 39 | } |
| 40 | |
| 41 | long operator--() |
| 42 | { |
| 43 | return __atomic_add_fetch( &value_, -1, __ATOMIC_ACQ_REL ); |
| 44 | } |
| 45 | |
| 46 | operator long() const |
| 47 | { |
| 48 | return __atomic_load_n( &value_, __ATOMIC_ACQUIRE ); |
| 49 | } |
| 50 | |
| 51 | private: |
| 52 | |
| 53 | atomic_count(atomic_count const &); |
| 54 | atomic_count & operator=(atomic_count const &); |
| 55 | |
| 56 | boost::int_least32_t value_; |
| 57 | }; |
| 58 | |
| 59 | } // namespace detail |
| 60 | |
| 61 | } // namespace boost |
| 62 | |
| 63 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_ATOMIC_HPP_INCLUDED |
| 64 | |