1 // Copyright (c) 2008, Google Inc. 2 // 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 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 #ifndef CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__ 31 #define CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__ 32 33 #include <windows.h> 34 35 namespace google_breakpad { 36 37 // Automatically enters the critical section in the constructor and leaves 38 // the critical section in the destructor. 39 class AutoCriticalSection { 40 public: 41 // Creates a new instance with the given critical section object 42 // and enters the critical section immediately. AutoCriticalSection(CRITICAL_SECTION * cs)43 explicit AutoCriticalSection(CRITICAL_SECTION* cs) : cs_(cs), taken_(false) { 44 assert(cs_); 45 Acquire(); 46 } 47 48 // Destructor: leaves the critical section. ~AutoCriticalSection()49 ~AutoCriticalSection() { 50 if (taken_) { 51 Release(); 52 } 53 } 54 55 // Enters the critical section. Recursive Acquire() calls are not allowed. Acquire()56 void Acquire() { 57 assert(!taken_); 58 EnterCriticalSection(cs_); 59 taken_ = true; 60 } 61 62 // Leaves the critical section. The caller should not call Release() unless 63 // the critical seciton has been entered already. Release()64 void Release() { 65 assert(taken_); 66 taken_ = false; 67 LeaveCriticalSection(cs_); 68 } 69 70 private: 71 // Disable copy ctor and operator=. 72 AutoCriticalSection(const AutoCriticalSection&); 73 AutoCriticalSection& operator=(const AutoCriticalSection&); 74 75 CRITICAL_SECTION* cs_; 76 bool taken_; 77 }; 78 79 } // namespace google_breakpad 80 81 #endif // CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__ 82