1 /******************************************************************************* 2 * Copyright (C) 2004-2008 Intel Corp. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * - Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * - Neither the name of Intel Corp. nor the names of its 15 * contributors may be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL Intel Corp. OR THE CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 *******************************************************************************/ 30 31 ////////////////////////////////////////////////////////////////////////// 32 // Lock.h 33 // 34 // This file contains the definition and implementation of the Lock class 35 // and the TryLock class 36 ////////////////////////////////////////////////////////////////////////// 37 #ifndef _LAD_LOCK_H 38 #define _LAD_LOCK_H 39 #include "RWLock.h" 40 41 #ifndef NULL 42 #define NULL 0 43 #endif 44 45 class Lock 46 { 47 public: Lock(Semaphore & sem)48 Lock(Semaphore &sem) : _sem(&sem), _rw_lock(NULL) 49 { 50 _sem->acquire(); 51 } 52 53 Lock(RWLock &rw_lock, RWLock::RWMode mode = RWLock::READ_ONLY) : _sem(NULL)54 _sem(NULL), _rw_lock(&rw_lock) 55 { 56 _rw_lock->acquire(mode); 57 } 58 ~Lock()59 ~Lock() 60 { 61 if (_sem) { 62 _sem->release(); 63 } 64 if (_rw_lock) { 65 _rw_lock->release(); 66 } 67 68 } 69 70 private: 71 Semaphore *_sem; 72 RWLock *_rw_lock; 73 }; 74 75 class TryLock 76 { 77 public: TryLock(Semaphore & sem,bool & is_locked)78 TryLock(Semaphore &sem, bool &is_locked) : _sem(&sem) 79 { 80 _locked = _sem->acquireTry(); 81 is_locked = _locked; 82 } 83 ~TryLock()84 ~TryLock() 85 { 86 if (_locked) { 87 _sem->release(); 88 } 89 } 90 91 private: 92 bool _locked; 93 Semaphore *_sem; 94 }; 95 96 #endif //_LAD_LOCK_H 97 98