1 // 2 // detail/gcc_hppa_fenced_block.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) 6 // 7 // Distributed under the Boost Software License, Version 1.0. (See accompanying 8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 // 10 11 #ifndef BOOST_ASIO_DETAIL_GCC_HPPA_FENCED_BLOCK_HPP 12 #define BOOST_ASIO_DETAIL_GCC_HPPA_FENCED_BLOCK_HPP 13 14 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 15 # pragma once 16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 17 18 #include <boost/asio/detail/config.hpp> 19 20 #if defined(__GNUC__) && (defined(__hppa) || defined(__hppa__)) 21 22 #include <boost/asio/detail/noncopyable.hpp> 23 24 #include <boost/asio/detail/push_options.hpp> 25 26 namespace boost { 27 namespace asio { 28 namespace detail { 29 30 class gcc_hppa_fenced_block 31 : private noncopyable 32 { 33 public: 34 enum half_t { half }; 35 enum full_t { full }; 36 37 // Constructor for a half fenced block. gcc_hppa_fenced_block(half_t)38 explicit gcc_hppa_fenced_block(half_t) 39 { 40 } 41 42 // Constructor for a full fenced block. gcc_hppa_fenced_block(full_t)43 explicit gcc_hppa_fenced_block(full_t) 44 { 45 barrier(); 46 } 47 48 // Destructor. ~gcc_hppa_fenced_block()49 ~gcc_hppa_fenced_block() 50 { 51 barrier(); 52 } 53 54 private: barrier()55 static void barrier() 56 { 57 // This is just a placeholder and almost certainly not sufficient. 58 __asm__ __volatile__ ("" : : : "memory"); 59 } 60 }; 61 62 } // namespace detail 63 } // namespace asio 64 } // namespace boost 65 66 #include <boost/asio/detail/pop_options.hpp> 67 68 #endif // defined(__GNUC__) && (defined(__hppa) || defined(__hppa__)) 69 70 #endif // BOOST_ASIO_DETAIL_GCC_HPPA_FENCED_BLOCK_HPP 71