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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.cpp | |
15 | * VERSION see <boost/version.hpp> | |
16 | * DESCRIPTION: Declares static_mutex lock type. | |
17 | */ | |
18 | ||
19 | #define BOOST_REGEX_SOURCE | |
20 | #include <boost/config.hpp> | |
21 | #include <boost/assert.hpp> | |
22 | ||
23 | #ifdef BOOST_HAS_THREADS | |
24 | ||
25 | #include <boost/regex/pending/static_mutex.hpp> | |
26 | ||
27 | #if defined(BOOST_HAS_WINTHREADS) | |
28 | #ifndef NOMINMAX | |
29 | # define NOMINMAX | |
30 | #endif | |
31 | #define WIN32_LEAN_AND_MEAN | |
32 | #include <windows.h> | |
33 | #include <boost/static_assert.hpp> | |
34 | #endif | |
35 | ||
36 | ||
37 | namespace boost{ | |
38 | ||
39 | #if defined(BOOST_HAS_PTHREADS) && defined(PTHREAD_MUTEX_INITIALIZER) | |
40 | ||
41 | scoped_static_mutex_lock::scoped_static_mutex_lock(static_mutex& m, bool lk) | |
42 | : m_mutex(m), m_have_lock(false) | |
43 | { | |
44 | if(lk) | |
45 | lock(); | |
46 | } | |
47 | ||
48 | scoped_static_mutex_lock::~scoped_static_mutex_lock() | |
49 | { | |
50 | if(m_have_lock) | |
51 | unlock(); | |
52 | } | |
53 | ||
54 | void scoped_static_mutex_lock::lock() | |
55 | { | |
56 | if(0 == m_have_lock) | |
57 | { | |
58 | // Client code will throw if this fails: | |
59 | m_have_lock = (pthread_mutex_lock(&(m_mutex.m_mutex)) == 0); | |
60 | } | |
61 | } | |
62 | ||
63 | void scoped_static_mutex_lock::unlock() | |
64 | { | |
65 | if(m_have_lock) | |
66 | { | |
67 | // If this fails there's nothing we can do except assert, | |
68 | // exceptions are out of the question as this code is called | |
69 | // from the lock's destructor: | |
70 | BOOST_VERIFY(pthread_mutex_unlock(&(m_mutex.m_mutex)) == 0); | |
71 | m_have_lock = false; | |
72 | } | |
73 | } | |
74 | ||
75 | #elif defined(BOOST_HAS_WINTHREADS) | |
76 | ||
77 | BOOST_STATIC_ASSERT(sizeof(LONG) == sizeof(boost::int32_t)); | |
78 | ||
79 | scoped_static_mutex_lock::scoped_static_mutex_lock(static_mutex& m, bool lk) | |
80 | : m_mutex(m), m_have_lock(false) | |
81 | { | |
82 | if(lk) | |
83 | lock(); | |
84 | } | |
85 | ||
86 | scoped_static_mutex_lock::~scoped_static_mutex_lock() | |
87 | { | |
88 | if(m_have_lock) | |
89 | unlock(); | |
90 | } | |
91 | ||
92 | void scoped_static_mutex_lock::lock() | |
93 | { | |
94 | if(0 == m_have_lock) | |
95 | { | |
96 | #if !defined(InterlockedCompareExchangePointer) | |
97 | while(0 != InterlockedCompareExchange(reinterpret_cast<void**>((boost::uint_least16_t*)&(m_mutex.m_mutex)), (void*)1, 0)) | |
98 | #else | |
99 | while(0 != InterlockedCompareExchange(reinterpret_cast<LONG*>(&(m_mutex.m_mutex)), 1, 0)) | |
100 | #endif | |
101 | { | |
102 | Sleep(0); | |
103 | } | |
104 | m_have_lock = true; | |
105 | } | |
106 | } | |
107 | ||
108 | void scoped_static_mutex_lock::unlock() | |
109 | { | |
110 | if(m_have_lock) | |
111 | { | |
112 | #if !defined(InterlockedCompareExchangePointer) | |
113 | InterlockedExchange((LONG*)&(m_mutex.m_mutex), 0); | |
114 | #else | |
115 | InterlockedExchange(reinterpret_cast<LONG*>(&(m_mutex.m_mutex)), 0); | |
116 | #endif | |
117 | m_have_lock = false; | |
118 | } | |
119 | } | |
120 | ||
121 | #else | |
122 | // | |
123 | // Portable version of a static mutex based on Boost.Thread library: | |
124 | // | |
125 | #include <stdlib.h> | |
126 | #include <boost/assert.hpp> | |
127 | ||
128 | boost::recursive_mutex* static_mutex::m_pmutex = 0; | |
129 | boost::once_flag static_mutex::m_once = BOOST_ONCE_INIT; | |
130 | ||
131 | extern "C" BOOST_REGEX_DECL void boost_regex_free_static_mutex() | |
132 | { | |
133 | delete static_mutex::m_pmutex; | |
134 | static_mutex::m_pmutex = 0; | |
135 | } | |
136 | ||
137 | void static_mutex::init() | |
138 | { | |
139 | m_pmutex = new boost::recursive_mutex(); | |
140 | int r = atexit(boost_regex_free_static_mutex); | |
141 | BOOST_ASSERT(0 == r); | |
142 | } | |
143 | ||
144 | scoped_static_mutex_lock::scoped_static_mutex_lock(static_mutex& , bool lk) | |
145 | : m_plock(0), m_have_lock(false) | |
146 | { | |
147 | if(lk) | |
148 | lock(); | |
149 | } | |
150 | ||
151 | scoped_static_mutex_lock::~scoped_static_mutex_lock() | |
152 | { | |
153 | if(m_have_lock) | |
154 | unlock(); | |
155 | delete m_plock; | |
156 | } | |
157 | ||
158 | void scoped_static_mutex_lock::lock() | |
159 | { | |
160 | if(0 == m_have_lock) | |
161 | { | |
162 | boost::call_once(static_mutex::m_once,&static_mutex::init); | |
163 | if(0 == m_plock) | |
164 | m_plock = new boost::unique_lock<boost::recursive_mutex>(*static_mutex::m_pmutex, boost::defer_lock); | |
165 | m_plock->lock(); | |
166 | m_have_lock = true; | |
167 | } | |
168 | } | |
169 | ||
170 | void scoped_static_mutex_lock::unlock() | |
171 | { | |
172 | if(m_have_lock) | |
173 | { | |
174 | m_plock->unlock(); | |
175 | m_have_lock = false; | |
176 | } | |
177 | } | |
178 | ||
179 | #endif | |
180 | ||
181 | } | |
182 | ||
183 | #endif // BOOST_HAS_THREADS |