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1 | /* |
2 | * Copyright Andrey Semashev 2007 - 2015. | |
3 | * Distributed under the Boost Software License, Version 1.0. | |
4 | * (See accompanying file LICENSE_1_0.txt or copy at | |
5 | * http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | /*! | |
8 | * \file thread_specific.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 01.03.2008 | |
11 | * | |
12 | * \brief This header is the Boost.Log library implementation, see the library documentation | |
13 | * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. | |
14 | */ | |
15 | ||
16 | #ifndef BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_ | |
17 | #define BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_ | |
18 | ||
19 | #include <boost/static_assert.hpp> | |
20 | #include <boost/type_traits/is_pod.hpp> | |
21 | #include <boost/log/detail/config.hpp> | |
22 | ||
23 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
24 | #pragma once | |
25 | #endif | |
26 | ||
27 | #if !defined(BOOST_LOG_NO_THREADS) | |
28 | ||
29 | #include <boost/log/detail/header.hpp> | |
30 | ||
31 | namespace boost { | |
32 | ||
33 | BOOST_LOG_OPEN_NAMESPACE | |
34 | ||
35 | namespace aux { | |
36 | ||
37 | //! Base class for TLS to hide platform-specific storage management | |
38 | class thread_specific_base | |
39 | { | |
40 | private: | |
41 | #if defined(BOOST_THREAD_PLATFORM_WIN32) | |
42 | typedef unsigned long key_storage; | |
43 | #else | |
44 | typedef void* key_storage; | |
45 | #endif | |
46 | ||
47 | key_storage m_Key; | |
48 | ||
49 | protected: | |
50 | BOOST_LOG_API thread_specific_base(); | |
51 | BOOST_LOG_API ~thread_specific_base(); | |
52 | BOOST_LOG_API void* get_content() const; | |
53 | BOOST_LOG_API void set_content(void* value) const; | |
54 | ||
55 | // Copying prohibited | |
56 | BOOST_DELETED_FUNCTION(thread_specific_base(thread_specific_base const&)) | |
57 | BOOST_DELETED_FUNCTION(thread_specific_base& operator= (thread_specific_base const&)) | |
58 | }; | |
59 | ||
60 | //! A TLS wrapper for small POD types with least possible overhead | |
61 | template< typename T > | |
62 | class thread_specific : | |
63 | public thread_specific_base | |
64 | { | |
65 | BOOST_STATIC_ASSERT_MSG(sizeof(T) <= sizeof(void*) && is_pod< T >::value, "Boost.Log: Thread-specific values must be PODs and must not exceed the size of a pointer"); | |
66 | ||
67 | //! Union to perform type casting | |
68 | union value_storage | |
69 | { | |
70 | void* as_pointer; | |
71 | T as_value; | |
72 | }; | |
73 | ||
74 | public: | |
75 | //! Default constructor | |
76 | BOOST_DEFAULTED_FUNCTION(thread_specific(), {}) | |
77 | //! Initializing constructor | |
78 | thread_specific(T const& value) | |
79 | { | |
80 | set(value); | |
81 | } | |
82 | //! Assignment | |
83 | thread_specific& operator= (T const& value) | |
84 | { | |
85 | set(value); | |
86 | return *this; | |
87 | } | |
88 | ||
89 | //! Accessor | |
90 | T get() const | |
91 | { | |
92 | value_storage cast = {}; | |
93 | cast.as_pointer = thread_specific_base::get_content(); | |
94 | return cast.as_value; | |
95 | } | |
96 | ||
97 | //! Setter | |
98 | void set(T const& value) | |
99 | { | |
100 | value_storage cast = {}; | |
101 | cast.as_value = value; | |
102 | thread_specific_base::set_content(cast.as_pointer); | |
103 | } | |
104 | }; | |
105 | ||
106 | } // namespace aux | |
107 | ||
108 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
109 | ||
110 | } // namespace boost | |
111 | ||
112 | #include <boost/log/detail/footer.hpp> | |
113 | ||
114 | #endif // !defined(BOOST_LOG_NO_THREADS) | |
115 | ||
116 | #endif // BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_ |