1 mike 1.2 //%2006////////////////////////////////////////////////////////////////////////
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.
11 // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
12 // EMC Corporation; Symantec Corporation; The Open Group.
13 //
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:
20 //
21 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
22 mike 1.2 // 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_ReadWriteSem_h
35 #define Pegasus_ReadWriteSem_h
36
37 #include <Pegasus/Common/Config.h>
38 #include <Pegasus/Common/Linkage.h>
39 #include <Pegasus/Common/Semaphore.h>
40 #include <Pegasus/Common/Mutex.h>
41 #include <Pegasus/Common/AtomicInt.h>
42
43 mike 1.2 #define PEG_SEM_READ 1
44 #define PEG_SEM_WRITE 2
45
46 PEGASUS_NAMESPACE_BEGIN
47
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85 mike 1.2 _rlock(10), _wlock(), _internal_lock(), _owner(Threads::self())
86 {
87 }
88 };
89 #endif /* PEGASUS_USE_POSIX_RWLOCK */
90
91 //==============================================================================
92 //
93 // ReadWriteSem
94 //
95 //==============================================================================
96
97 class PEGASUS_COMMON_LINKAGE ReadWriteSem
98 {
99 public:
100
101 ReadWriteSem();
102
103 ~ReadWriteSem();
104
105 // @exception Deadlock
106 mike 1.2 // @exception Permission
107 // @exception WaitFailed
108 inline void wait_read(ThreadType caller)
109 {
110 wait(PEG_SEM_READ, caller );
111 }
112
113 // @exception Deadlock
114 // @exception Permission
115 // @exception WaitFailed
116 inline void wait_write(ThreadType caller)
117 {
118 wait(PEG_SEM_WRITE, caller);
119 }
120
121 // @exception Permission
122 inline void unlock_read(ThreadType caller)
123 {
124 unlock(PEG_SEM_READ, caller);
125 }
126
127 mike 1.2 // @exception Permission
128 inline void unlock_write(ThreadType caller)
129 {
130 unlock(PEG_SEM_WRITE, caller);
131 }
132
133 int read_count() const;
134 int write_count() const;
135
136 // @exception Deadlock
137 // @exception Permission
138 // @exception WaitFailed
139 // @exception TooManyReaders
140 void wait(Uint32 mode, ThreadType caller);
141
142 // @exception Permission
143 void unlock(Uint32 mode, ThreadType caller);
144
145 private:
146 AtomicInt _readers;
147 AtomicInt _writers;
148 mike 1.2 ReadWriteSemRep _rwlock;
149 friend void extricate_read_write(void *);
150 };
151
152 //==============================================================================
153 //
154 // ReadLock
155 //
156 //==============================================================================
157
158 class ReadLock
159 {
160 public:
161
162 ReadLock(ReadWriteSem& rwsem) : _rwsem(rwsem)
163 {
164 _rwsem.wait_read(Threads::self());
165 }
166
167 ~ReadLock()
168 {
169 mike 1.2 _rwsem.unlock_read(Threads::self());
170 }
171
172 private:
173 ReadWriteSem & _rwsem;
174 };
175
176 //==============================================================================
177 //
178 // WriteLock
179 //
180 //==============================================================================
181
182 class WriteLock
183 {
184 public:
185
186 WriteLock(ReadWriteSem& rwsem) : _rwsem(rwsem)
187 {
188 _rwsem.wait_write(Threads::self());
189 }
190 mike 1.2
191 ~WriteLock()
192 {
193 _rwsem.unlock_write(Threads::self());
194 }
195
196 private:
197 ReadWriteSem & _rwsem;
198 };
199
200 PEGASUS_NAMESPACE_END
201
202 #endif /* Pegasus_ReadWriteSem_h */
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