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1 | /* | |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * Copyright (c) 2014 Andrey Semashev | |
7 | */ | |
8 | /*! | |
9 | * \file atomic/detail/atomic_flag.hpp | |
10 | * | |
11 | * This header contains interface definition of \c atomic_flag. | |
12 | */ | |
13 | ||
14 | #ifndef BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_ | |
15 | #define BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_ | |
16 | ||
17 | #include <boost/assert.hpp> | |
18 | #include <boost/memory_order.hpp> | |
19 | #include <boost/atomic/detail/config.hpp> | |
20 | #include <boost/atomic/detail/operations_lockfree.hpp> | |
21 | ||
22 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
23 | #pragma once | |
24 | #endif | |
25 | ||
26 | /* | |
27 | * IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE, | |
28 | * see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp. | |
29 | */ | |
30 | ||
31 | namespace boost { | |
32 | namespace atomics { | |
33 | ||
34 | #if defined(BOOST_NO_CXX11_CONSTEXPR) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) | |
35 | #define BOOST_ATOMIC_NO_ATOMIC_FLAG_INIT | |
36 | #else | |
37 | #define BOOST_ATOMIC_FLAG_INIT {} | |
38 | #endif | |
39 | ||
40 | struct atomic_flag | |
41 | { | |
42 | typedef atomics::detail::operations< 1u, false > operations; | |
43 | typedef operations::storage_type storage_type; | |
44 | ||
45 | operations::aligned_storage_type m_storage; | |
46 | ||
47 | BOOST_FORCEINLINE BOOST_CONSTEXPR atomic_flag() BOOST_NOEXCEPT : m_storage(0) | |
48 | { | |
49 | } | |
50 | ||
51 | BOOST_FORCEINLINE bool test_and_set(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT | |
52 | { | |
53 | return operations::test_and_set(m_storage.value, order); | |
54 | } | |
55 | ||
56 | BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT | |
57 | { | |
58 | BOOST_ASSERT(order != memory_order_acquire); | |
59 | BOOST_ASSERT(order != memory_order_acq_rel); | |
60 | operations::clear(m_storage.value, order); | |
61 | } | |
62 | ||
63 | BOOST_DELETED_FUNCTION(atomic_flag(atomic_flag const&)) | |
64 | BOOST_DELETED_FUNCTION(atomic_flag& operator= (atomic_flag const&)) | |
65 | }; | |
66 | ||
67 | } // namespace atomics | |
68 | } // namespace boost | |
69 | ||
70 | #endif // BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_ |