1 // Copyright 2008 Google LLC 2 // 3 // Redistribution and use in source and binary forms, with or without 4 // modification, are permitted provided that the following conditions are 5 // met: 6 // 7 // * Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above 10 // copyright notice, this list of conditions and the following disclaimer 11 // in the documentation and/or other materials provided with the 12 // distribution. 13 // * Neither the name of Google LLC nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 #ifndef CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__ 30 #define CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__ 31 32 #include <windows.h> 33 34 namespace google_breakpad { 35 36 // Automatically enters the critical section in the constructor and leaves 37 // the critical section in the destructor. 38 class AutoCriticalSection { 39 public: 40 // Creates a new instance with the given critical section object 41 // and enters the critical section immediately. AutoCriticalSection(CRITICAL_SECTION * cs)42 explicit AutoCriticalSection(CRITICAL_SECTION* cs) : cs_(cs), taken_(false) { 43 assert(cs_); 44 Acquire(); 45 } 46 47 // Destructor: leaves the critical section. ~AutoCriticalSection()48 ~AutoCriticalSection() { 49 if (taken_) { 50 Release(); 51 } 52 } 53 54 // Enters the critical section. Recursive Acquire() calls are not allowed. Acquire()55 void Acquire() { 56 assert(!taken_); 57 EnterCriticalSection(cs_); 58 taken_ = true; 59 } 60 61 // Leaves the critical section. The caller should not call Release() unless 62 // the critical seciton has been entered already. Release()63 void Release() { 64 assert(taken_); 65 taken_ = false; 66 LeaveCriticalSection(cs_); 67 } 68 69 private: 70 // Disable copy ctor and operator=. 71 AutoCriticalSection(const AutoCriticalSection&); 72 AutoCriticalSection& operator=(const AutoCriticalSection&); 73 74 CRITICAL_SECTION* cs_; 75 bool taken_; 76 }; 77 78 } // namespace google_breakpad 79 80 #endif // CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__ 81