1 #ifndef COIN_SBRWMUTEX_H
2 #define COIN_SBRWMUTEX_H
3 
4 /**************************************************************************\
5  * Copyright (c) Kongsberg Oil & Gas Technologies AS
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are
10  * met:
11  *
12  * Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in the
17  * documentation and/or other materials provided with the distribution.
18  *
19  * Neither the name of the copyright holder nor the names of its
20  * contributors may be used to endorse or promote products derived from
21  * this software without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 \**************************************************************************/
35 
36 #include <Inventor/C/threads/rwmutex.h>
37 
38 class SbRWMutex {
39 public:
40   enum Precedence {
41     READ_PRECEDENCE,
42     WRITE_PRECEDENCE
43   };
44 
SbRWMutex(Precedence policy)45   SbRWMutex(Precedence policy) {
46     this->rwmutex = cc_rwmutex_construct_etc(
47       (policy == WRITE_PRECEDENCE)? CC_WRITE_PRECEDENCE : CC_READ_PRECEDENCE);
48   }
~SbRWMutex(void)49   ~SbRWMutex(void) { cc_rwmutex_destruct(this->rwmutex); }
50 
writeLock(void)51   int writeLock(void) {
52     return cc_rwmutex_write_lock(this->rwmutex) == CC_OK ? 0 : 1;
53   }
tryWriteLock(void)54   SbBool tryWriteLock(void) {
55     return cc_rwmutex_write_try_lock(this->rwmutex) == CC_OK;
56   }
writeUnlock(void)57   int writeUnlock(void) {
58     return cc_rwmutex_write_unlock(this->rwmutex) == CC_OK ? 0 : 1;
59   }
60 
readLock(void)61   int readLock(void) {
62     return cc_rwmutex_read_lock(this->rwmutex) == CC_OK ? 0 : 1;
63   }
tryReadLock(void)64   int tryReadLock(void) {
65     return cc_rwmutex_read_try_lock(this->rwmutex) == CC_OK;
66   }
readUnlock(void)67   int readUnlock(void) {
68     return cc_rwmutex_read_unlock(this->rwmutex) == CC_OK ? 0 : 1;
69   }
70 
71 private:
72   cc_rwmutex * rwmutex;
73 };
74 
75 #endif // !COIN_SBRWMUTEX_H
76