[80] | 1 | // |
---|
| 2 | // RWLock_POSIX.h |
---|
| 3 | // |
---|
| 4 | // $Id: //poco/1.3/Foundation/include/Poco/RWLock_POSIX.h#1 $ |
---|
| 5 | // |
---|
| 6 | // Library: Foundation |
---|
| 7 | // Package: Threading |
---|
| 8 | // Module: RWLock |
---|
| 9 | // |
---|
| 10 | // Definition of the RWLockImpl class for POSIX Threads. |
---|
| 11 | // |
---|
| 12 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
---|
| 13 | // and Contributors. |
---|
| 14 | // |
---|
| 15 | // Permission is hereby granted, free of charge, to any person or organization |
---|
| 16 | // obtaining a copy of the software and accompanying documentation covered by |
---|
| 17 | // this license (the "Software") to use, reproduce, display, distribute, |
---|
| 18 | // execute, and transmit the Software, and to prepare derivative works of the |
---|
| 19 | // Software, and to permit third-parties to whom the Software is furnished to |
---|
| 20 | // do so, all subject to the following: |
---|
| 21 | // |
---|
| 22 | // The copyright notices in the Software and this entire statement, including |
---|
| 23 | // the above license grant, this restriction and the following disclaimer, |
---|
| 24 | // must be included in all copies of the Software, in whole or in part, and |
---|
| 25 | // all derivative works of the Software, unless such copies or derivative |
---|
| 26 | // works are solely in the form of machine-executable object code generated by |
---|
| 27 | // a source language processor. |
---|
| 28 | // |
---|
| 29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
---|
| 30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
---|
| 31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
---|
| 32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
---|
| 33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
---|
| 34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
---|
| 35 | // DEALINGS IN THE SOFTWARE. |
---|
| 36 | // |
---|
| 37 | |
---|
| 38 | |
---|
| 39 | #ifndef Foundation_RWLock_POSIX_INCLUDED |
---|
| 40 | #define Foundation_RWLock_POSIX_INCLUDED |
---|
| 41 | |
---|
| 42 | |
---|
| 43 | #include "Poco/Foundation.h" |
---|
| 44 | #include "Poco/Exception.h" |
---|
| 45 | #include <pthread.h> |
---|
| 46 | #include <errno.h> |
---|
| 47 | |
---|
| 48 | |
---|
| 49 | namespace Poco { |
---|
| 50 | |
---|
| 51 | |
---|
| 52 | class Foundation_API RWLockImpl |
---|
| 53 | { |
---|
| 54 | protected: |
---|
| 55 | RWLockImpl(); |
---|
| 56 | ~RWLockImpl(); |
---|
| 57 | void readLockImpl(); |
---|
| 58 | bool tryReadLockImpl(); |
---|
| 59 | void writeLockImpl(); |
---|
| 60 | bool tryWriteLockImpl(); |
---|
| 61 | void unlockImpl(); |
---|
| 62 | |
---|
| 63 | private: |
---|
| 64 | pthread_rwlock_t _rwl; |
---|
| 65 | }; |
---|
| 66 | |
---|
| 67 | |
---|
| 68 | // |
---|
| 69 | // inlines |
---|
| 70 | // |
---|
| 71 | inline void RWLockImpl::readLockImpl() |
---|
| 72 | { |
---|
| 73 | if (pthread_rwlock_rdlock(&_rwl)) |
---|
| 74 | throw SystemException("cannot lock reader/writer lock"); |
---|
| 75 | } |
---|
| 76 | |
---|
| 77 | |
---|
| 78 | inline bool RWLockImpl::tryReadLockImpl() |
---|
| 79 | { |
---|
| 80 | int rc = pthread_rwlock_tryrdlock(&_rwl); |
---|
| 81 | if (rc == 0) |
---|
| 82 | return true; |
---|
| 83 | else if (rc == EBUSY) |
---|
| 84 | return false; |
---|
| 85 | else |
---|
| 86 | throw SystemException("cannot lock reader/writer lock"); |
---|
| 87 | |
---|
| 88 | } |
---|
| 89 | |
---|
| 90 | |
---|
| 91 | inline void RWLockImpl::writeLockImpl() |
---|
| 92 | { |
---|
| 93 | if (pthread_rwlock_wrlock(&_rwl)) |
---|
| 94 | throw SystemException("cannot lock reader/writer lock"); |
---|
| 95 | } |
---|
| 96 | |
---|
| 97 | |
---|
| 98 | inline bool RWLockImpl::tryWriteLockImpl() |
---|
| 99 | { |
---|
| 100 | int rc = pthread_rwlock_trywrlock(&_rwl); |
---|
| 101 | if (rc == 0) |
---|
| 102 | return true; |
---|
| 103 | else if (rc == EBUSY) |
---|
| 104 | return false; |
---|
| 105 | else |
---|
| 106 | throw SystemException("cannot lock reader/writer lock"); |
---|
| 107 | |
---|
| 108 | } |
---|
| 109 | |
---|
| 110 | |
---|
| 111 | inline void RWLockImpl::unlockImpl() |
---|
| 112 | { |
---|
| 113 | if (pthread_rwlock_unlock(&_rwl)) |
---|
| 114 | throw SystemException("cannot unlock mutex"); |
---|
| 115 | } |
---|
| 116 | |
---|
| 117 | |
---|
| 118 | } // namespace Poco |
---|
| 119 | |
---|
| 120 | |
---|
| 121 | #endif // Foundation_RWLock_POSIX_INCLUDED |
---|