1 | // |
---|---|
2 | // RWLock_POSIX.h |
3 | // |
4 | // Library: Foundation |
5 | // Package: Threading |
6 | // Module: RWLock |
7 | // |
8 | // Definition of the RWLockImpl class for POSIX Threads. |
9 | // |
10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
11 | // and Contributors. |
12 | // |
13 | // SPDX-License-Identifier: BSL-1.0 |
14 | // |
15 | |
16 | |
17 | #ifndef Foundation_RWLock_POSIX_INCLUDED |
18 | #define Foundation_RWLock_POSIX_INCLUDED |
19 | |
20 | |
21 | #include "Poco/Foundation.h" |
22 | #include "Poco/Exception.h" |
23 | #include <pthread.h> |
24 | #include <errno.h> |
25 | |
26 | |
27 | namespace Poco { |
28 | |
29 | |
30 | class Foundation_API RWLockImpl |
31 | { |
32 | protected: |
33 | RWLockImpl(); |
34 | ~RWLockImpl(); |
35 | void readLockImpl(); |
36 | bool tryReadLockImpl(); |
37 | void writeLockImpl(); |
38 | bool tryWriteLockImpl(); |
39 | void unlockImpl(); |
40 | |
41 | private: |
42 | pthread_rwlock_t _rwl; |
43 | }; |
44 | |
45 | |
46 | // |
47 | // inlines |
48 | // |
49 | inline void RWLockImpl::readLockImpl() |
50 | { |
51 | if (pthread_rwlock_rdlock(&_rwl)) |
52 | throw SystemException("cannot lock reader/writer lock"); |
53 | } |
54 | |
55 | |
56 | inline bool RWLockImpl::tryReadLockImpl() |
57 | { |
58 | int rc = pthread_rwlock_tryrdlock(&_rwl); |
59 | if (rc == 0) |
60 | return true; |
61 | else if (rc == EBUSY) |
62 | return false; |
63 | else |
64 | throw SystemException("cannot lock reader/writer lock"); |
65 | |
66 | } |
67 | |
68 | |
69 | inline void RWLockImpl::writeLockImpl() |
70 | { |
71 | if (pthread_rwlock_wrlock(&_rwl)) |
72 | throw SystemException("cannot lock reader/writer lock"); |
73 | } |
74 | |
75 | |
76 | inline bool RWLockImpl::tryWriteLockImpl() |
77 | { |
78 | int rc = pthread_rwlock_trywrlock(&_rwl); |
79 | if (rc == 0) |
80 | return true; |
81 | else if (rc == EBUSY) |
82 | return false; |
83 | else |
84 | throw SystemException("cannot lock reader/writer lock"); |
85 | |
86 | } |
87 | |
88 | |
89 | inline void RWLockImpl::unlockImpl() |
90 | { |
91 | if (pthread_rwlock_unlock(&_rwl)) |
92 | throw SystemException("cannot unlock mutex"); |
93 | } |
94 | |
95 | |
96 | } // namespace Poco |
97 | |
98 | |
99 | #endif // Foundation_RWLock_POSIX_INCLUDED |
100 |