1 karl 1.3 //%2006////////////////////////////////////////////////////////////////////////
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2 mike 1.2 //
3 // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
4 // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
5 // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
6 // IBM Corp.; EMC Corporation, The Open Group.
7 // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
8 // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
9 // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
10 // EMC Corporation; VERITAS Software Corporation; The Open Group.
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11 karl 1.3 // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
12 // EMC Corporation; Symantec Corporation; The Open Group.
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13 mike 1.2 //
14 // Permission is hereby granted, free of charge, to any person obtaining a copy
15 // of this software and associated documentation files (the "Software"), to
16 // deal in the Software without restriction, including without limitation the
17 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
18 // sell copies of the Software, and to permit persons to whom the Software is
19 // furnished to do so, subject to the following conditions:
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20 karl 1.3 //
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21 mike 1.2 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
22 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
23 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
24 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
25 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
26 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
27 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 //
30 //==============================================================================
31 //
32 //%/////////////////////////////////////////////////////////////////////////////
33
34 #ifndef Pegasus_Mutex_h
35 #define Pegasus_Mutex_h
36
37 #include <Pegasus/Common/Config.h>
38 #include <Pegasus/Common/Linkage.h>
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39 mike 1.5 #include <Pegasus/Common/IPCExceptions.h>
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40 mike 1.4 #include <Pegasus/Common/Magic.h>
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41 mike 1.5 #include <Pegasus/Common/Threads.h>
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42 mike 1.2
43 PEGASUS_NAMESPACE_BEGIN
44
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45 mike 1.5 //==============================================================================
46 //
47 // MutexRep
48 //
49 //==============================================================================
50
51 #if defined(PEGASUS_HAVE_PTHREADS)
52 typedef pthread_mutex_t MutexType;
53 inline void mutex_lock(MutexType* mutex) { pthread_mutex_lock(mutex); }
54 inline void mutex_unlock(MutexType* mutex) { pthread_mutex_unlock(mutex); }
55 struct MutexRep
56 {
57 pthread_mutex_t mutex;
58 int count;
59 };
60 # define PEGASUS_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
61 #endif
62
63 #if defined(PEGASUS_HAVE_WINDOWS_THREADS)
64 typedef HANDLE MutexType;
65 inline void mutex_lock(MutexType* m) { WaitForSingleObject(*m, INFINITE); }
66 mike 1.5 inline void mutex_unlock(MutexType* m) { ReleaseMutex(*m); }
67 struct MutexRep
68 {
69 MutexType handle;
70 size_t count;
71 };
72 # define PEGASUS_MUTEX_INITIALIZER (CreateMutex(NULL, FALSE, NULL))
73 #endif
74
75 //==============================================================================
76 //
77 // Mutex
78 //
79 //==============================================================================
80
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81 mike 1.2 class PEGASUS_COMMON_LINKAGE Mutex
82 {
83 public:
84
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85 mike 1.6 enum RecursiveTag { RECURSIVE };
86 enum NonRecursiveTag { NON_RECURSIVE };
87
88 /** Default constructor creates a recursive mutex.
89 */
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90 mike 1.2 Mutex();
91
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92 mike 1.6 /** Call as Mutex(Mutex::RECURSIVE) to create a recursive mutex.
93 */
94 Mutex(RecursiveTag);
95
96 /** Call as Mutex(Mutex::NON_RECURSIVE) to create a non-recursive mutex.
97 */
98 Mutex(NonRecursiveTag);
99
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100 mike 1.2 ~Mutex();
101
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102 mike 1.5 void lock();
103
104 void try_lock();
105
106 void timed_lock(Uint32 milliseconds);
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107 mike 1.2
108 void unlock();
109
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110 thilo.boehm 1.11 #if defined(PEGASUS_OS_LINUX) || \
111 (defined(PEGASUS_OS_ZOS) && !(__TARGET_LIB__ < 0x41090000))
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112 kumpf 1.9 /**
113 This method must only be called after a fork() to reset the mutex
114 lock status in the new process. Any other use of this method is
115 unsafe.
116 */
117 void reinitialize();
118 #endif
119
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120 mike 1.5 private:
121 Mutex(const Mutex&);
122 Mutex& operator=(const Mutex&);
123
124 MutexRep _rep;
125 Magic<0x57D11485> _magic;
126
127 friend class Condition;
128 };
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129 mike 1.2
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130 mike 1.5 //==============================================================================
131 //
132 // AutoMutex
133 //
134 //==============================================================================
135
136 class PEGASUS_COMMON_LINKAGE AutoMutex
137 {
138 public:
139
140 AutoMutex(Mutex& mutex) : _mutex(mutex)
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141 mike 1.2 {
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142 mike 1.5 _mutex.lock();
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143 mike 1.2 }
144
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145 mike 1.5 ~AutoMutex()
146 {
147 _mutex.unlock();
148 }
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149 mike 1.2
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150 mike 1.5 private:
151 AutoMutex(); // Unimplemented
152 AutoMutex(const AutoMutex& x); // Unimplemented
153 AutoMutex& operator=(const AutoMutex& x); // Unimplemented
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154 mike 1.4
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155 mike 1.5 Mutex& _mutex;
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156 mike 1.2 };
157
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158 kumpf 1.9 //==============================================================================
159 //
160 // PEGASUS_FORK_SAFE_MUTEX
161 //
162 //==============================================================================
163
164 // Use of this macro ensures that a static Mutex is not locked across a fork().
165
166 #if !defined(PEGASUS_HAVE_PTHREADS) || \
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167 marek 1.10 (defined(PEGASUS_OS_ZOS) && (__TARGET_LIB__ < 0x41090000)) || \
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168 kumpf 1.9 defined(PEGASUS_OS_VMS)
169
170 # define PEGASUS_FORK_SAFE_MUTEX(mutex)
171
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172 thilo.boehm 1.11 #elif defined(PEGASUS_OS_LINUX) || \
173 (defined(PEGASUS_OS_ZOS) && !(__TARGET_LIB__ < 0x41090000))
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174 kumpf 1.9
175 # define PEGASUS_FORK_SAFE_MUTEX(mutex) \
176 class ForkSafeMutex ## mutex \
177 { \
178 public: \
179 ForkSafeMutex ## mutex() \
180 { \
181 pthread_atfork( \
182 0, \
183 0, \
184 _reinitializeMutex); \
185 } \
186 \
187 private: \
188 static void _reinitializeMutex() \
189 { \
190 mutex.reinitialize(); \
191 } \
192 }; \
193 \
194 static ForkSafeMutex ## mutex __forkSafeMutex ## mutex;
195 kumpf 1.9
196 #else
197
198 # define PEGASUS_FORK_SAFE_MUTEX(mutex) \
199 class ForkSafeMutex ## mutex \
200 { \
201 public: \
202 ForkSafeMutex ## mutex() \
203 { \
204 pthread_atfork( \
205 _lockMutex, \
206 _unlockMutex, \
207 _unlockMutex); \
208 } \
209 \
210 private: \
211 static void _lockMutex() \
212 { \
213 mutex.lock(); \
214 } \
215 \
216 kumpf 1.9 static void _unlockMutex() \
217 { \
218 mutex.unlock(); \
219 } \
220 }; \
221 \
222 static ForkSafeMutex ## mutex __forkSafeMutex ## mutex;
223
224 #endif
225
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226 mike 1.2 PEGASUS_NAMESPACE_END
227
228 #endif /* Pegasus_Mutex_h */
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