1 // 2 // detail/macos_fenced_block.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2015 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_MACOS_FENCED_BLOCK_HPP 12 #define BOOST_ASIO_DETAIL_MACOS_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(__MACH__) && defined(__APPLE__) 21 22 #include <libkern/OSAtomic.h> 23 24 #include <boost/asio/detail/push_options.hpp> 25 26 namespace boost { 27 namespace asio { 28 namespace detail { 29 30 class macos_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. macos_fenced_block(half_t)38 explicit macos_fenced_block(half_t) 39 { 40 } 41 42 // Constructor for a full fenced block. macos_fenced_block(full_t)43 explicit macos_fenced_block(full_t) 44 { 45 OSMemoryBarrier(); 46 } 47 48 // Destructor. ~macos_fenced_block()49 ~macos_fenced_block() 50 { 51 OSMemoryBarrier(); 52 } 53 }; 54 55 } // namespace detail 56 } // namespace asio 57 } // namespace boost 58 59 #include <boost/asio/detail/pop_options.hpp> 60 61 #endif // defined(__MACH__) && defined(__APPLE__) 62 63 #endif // BOOST_ASIO_DETAIL_MACOS_FENCED_BLOCK_HPP 64