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7c673cae | 1 | // |
b32b8144 FG |
2 | // detail/std_fenced_block.hpp |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7c673cae | 4 | // |
1e59de90 | 5 | // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
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 | ||
b32b8144 FG |
11 | #ifndef BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP |
12 | #define BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP | |
7c673cae FG |
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 | ||
b32b8144 | 20 | #if defined(BOOST_ASIO_HAS_STD_ATOMIC) |
7c673cae | 21 | |
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22 | #include <atomic> |
23 | #include <boost/asio/detail/noncopyable.hpp> | |
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24 | |
25 | #include <boost/asio/detail/push_options.hpp> | |
26 | ||
27 | namespace boost { | |
28 | namespace asio { | |
29 | namespace detail { | |
30 | ||
b32b8144 | 31 | class std_fenced_block |
7c673cae FG |
32 | : private noncopyable |
33 | { | |
34 | public: | |
35 | enum half_t { half }; | |
36 | enum full_t { full }; | |
37 | ||
38 | // Constructor for a half fenced block. | |
b32b8144 | 39 | explicit std_fenced_block(half_t) |
7c673cae FG |
40 | { |
41 | } | |
42 | ||
43 | // Constructor for a full fenced block. | |
b32b8144 | 44 | explicit std_fenced_block(full_t) |
7c673cae | 45 | { |
b32b8144 | 46 | std::atomic_thread_fence(std::memory_order_acquire); |
7c673cae FG |
47 | } |
48 | ||
49 | // Destructor. | |
b32b8144 | 50 | ~std_fenced_block() |
7c673cae | 51 | { |
b32b8144 | 52 | std::atomic_thread_fence(std::memory_order_release); |
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53 | } |
54 | }; | |
55 | ||
56 | } // namespace detail | |
57 | } // namespace asio | |
58 | } // namespace boost | |
59 | ||
60 | #include <boost/asio/detail/pop_options.hpp> | |
61 | ||
b32b8144 | 62 | #endif // defined(BOOST_ASIO_HAS_STD_ATOMIC) |
7c673cae | 63 | |
b32b8144 | 64 | #endif // BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP |