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