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1 | /* |
2 | * | |
3 | * Copyright (c) 2004 | |
4 | * John Maddock | |
5 | * | |
6 | * Use, modification and distribution are subject to the | |
7 | * Boost Software License, Version 1.0. (See accompanying file | |
8 | * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | * | |
10 | */ | |
11 | ||
12 | /* | |
13 | * LOCATION: see http://www.boost.org for most recent version. | |
14 | * FILE static_mutex.hpp | |
15 | * VERSION see <boost/version.hpp> | |
16 | * DESCRIPTION: Declares static_mutex lock type, there are three different | |
17 | * implementations: POSIX pthreads, WIN32 threads, and portable, | |
18 | * these are described in more detail below. | |
19 | */ | |
20 | ||
21 | #ifndef BOOST_REGEX_STATIC_MUTEX_HPP | |
22 | #define BOOST_REGEX_STATIC_MUTEX_HPP | |
23 | ||
24 | #include <boost/config.hpp> | |
25 | #include <boost/regex/config.hpp> // dll import/export options. | |
26 | ||
27 | #ifdef BOOST_HAS_PTHREADS | |
28 | #include <pthread.h> | |
29 | #endif | |
30 | ||
31 | #if defined(BOOST_HAS_PTHREADS) && defined(PTHREAD_MUTEX_INITIALIZER) | |
32 | // | |
33 | // pthreads version: | |
34 | // simple wrap around a pthread_mutex_t initialized with | |
35 | // PTHREAD_MUTEX_INITIALIZER. | |
36 | // | |
37 | namespace boost{ | |
38 | ||
39 | class static_mutex; | |
40 | ||
41 | #define BOOST_STATIC_MUTEX_INIT { PTHREAD_MUTEX_INITIALIZER, } | |
42 | ||
43 | class BOOST_REGEX_DECL scoped_static_mutex_lock | |
44 | { | |
45 | public: | |
46 | scoped_static_mutex_lock(static_mutex& mut, bool lk = true); | |
47 | ~scoped_static_mutex_lock(); | |
48 | inline bool locked()const | |
49 | { | |
50 | return m_have_lock; | |
51 | } | |
52 | inline operator void const*()const | |
53 | { | |
54 | return locked() ? this : 0; | |
55 | } | |
56 | void lock(); | |
57 | void unlock(); | |
58 | private: | |
59 | static_mutex& m_mutex; | |
60 | bool m_have_lock; | |
61 | }; | |
62 | ||
63 | class static_mutex | |
64 | { | |
65 | public: | |
66 | typedef scoped_static_mutex_lock scoped_lock; | |
67 | pthread_mutex_t m_mutex; | |
68 | }; | |
69 | ||
70 | } // namespace boost | |
71 | #elif defined(BOOST_HAS_WINTHREADS) | |
72 | // | |
73 | // Win32 version: | |
74 | // Use a 32-bit int as a lock, along with a test-and-set | |
75 | // implementation using InterlockedCompareExchange. | |
76 | // | |
77 | ||
78 | #include <boost/cstdint.hpp> | |
79 | ||
80 | namespace boost{ | |
81 | ||
82 | class BOOST_REGEX_DECL scoped_static_mutex_lock; | |
83 | ||
84 | class static_mutex | |
85 | { | |
86 | public: | |
87 | typedef scoped_static_mutex_lock scoped_lock; | |
88 | boost::int32_t m_mutex; | |
89 | }; | |
90 | ||
91 | #define BOOST_STATIC_MUTEX_INIT { 0, } | |
92 | ||
93 | class BOOST_REGEX_DECL scoped_static_mutex_lock | |
94 | { | |
95 | public: | |
96 | scoped_static_mutex_lock(static_mutex& mut, bool lk = true); | |
97 | ~scoped_static_mutex_lock(); | |
98 | operator void const*()const | |
99 | { | |
100 | return locked() ? this : 0; | |
101 | } | |
102 | bool locked()const | |
103 | { | |
104 | return m_have_lock; | |
105 | } | |
106 | void lock(); | |
107 | void unlock(); | |
108 | private: | |
109 | static_mutex& m_mutex; | |
110 | bool m_have_lock; | |
111 | scoped_static_mutex_lock(const scoped_static_mutex_lock&); | |
112 | scoped_static_mutex_lock& operator=(const scoped_static_mutex_lock&); | |
113 | }; | |
114 | ||
115 | } // namespace | |
116 | ||
117 | #else | |
118 | // | |
119 | // Portable version of a static mutex based on Boost.Thread library: | |
120 | // This has to use a single mutex shared by all instances of static_mutex | |
121 | // because boost::call_once doesn't alow us to pass instance information | |
122 | // down to the initialisation proceedure. In fact the initialisation routine | |
123 | // may need to be called more than once - but only once per instance. | |
124 | // | |
125 | // Since this preprocessor path is almost never taken, we hide these header | |
126 | // dependencies so that build tools don't find them. | |
127 | // | |
128 | #define BOOST_REGEX_H1 <boost/thread/once.hpp> | |
129 | #define BOOST_REGEX_H2 <boost/thread/recursive_mutex.hpp> | |
130 | #define BOOST_REGEX_H3 <boost/thread/lock_types.hpp> | |
131 | #include BOOST_REGEX_H1 | |
132 | #include BOOST_REGEX_H2 | |
133 | #include BOOST_REGEX_H3 | |
134 | #undef BOOST_REGEX_H1 | |
135 | #undef BOOST_REGEX_H2 | |
136 | #undef BOOST_REGEX_H3 | |
137 | ||
138 | namespace boost{ | |
139 | ||
140 | class BOOST_REGEX_DECL scoped_static_mutex_lock; | |
141 | extern "C" BOOST_REGEX_DECL void boost_regex_free_static_mutex(); | |
142 | ||
143 | class BOOST_REGEX_DECL static_mutex | |
144 | { | |
145 | public: | |
146 | typedef scoped_static_mutex_lock scoped_lock; | |
147 | static void init(); | |
148 | static boost::recursive_mutex* m_pmutex; | |
149 | static boost::once_flag m_once; | |
150 | }; | |
151 | ||
152 | #define BOOST_STATIC_MUTEX_INIT { } | |
153 | ||
154 | class BOOST_REGEX_DECL scoped_static_mutex_lock | |
155 | { | |
156 | public: | |
157 | scoped_static_mutex_lock(static_mutex& mut, bool lk = true); | |
158 | ~scoped_static_mutex_lock(); | |
159 | operator void const*()const; | |
160 | bool locked()const; | |
161 | void lock(); | |
162 | void unlock(); | |
163 | private: | |
164 | boost::unique_lock<boost::recursive_mutex>* m_plock; | |
165 | bool m_have_lock; | |
166 | }; | |
167 | ||
168 | inline scoped_static_mutex_lock::operator void const*()const | |
169 | { | |
170 | return locked() ? this : 0; | |
171 | } | |
172 | ||
173 | inline bool scoped_static_mutex_lock::locked()const | |
174 | { | |
175 | return m_have_lock; | |
176 | } | |
177 | ||
178 | } // namespace | |
179 | ||
180 | #endif | |
181 | ||
182 | #endif |