1 // Copyright (C) 2014 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef EMUGL_MUTEX_H 16 #define EMUGL_MUTEX_H 17 18 #ifdef _WIN32 19 # define WIN32_LEAN_AND_MEAN 1 20 # include <windows.h> 21 #else 22 # include <pthread.h> 23 #endif 24 25 namespace emugl { 26 27 // Simple wrapper class for mutexes. 28 class Mutex { 29 public: 30 // Constructor. Mutex()31 Mutex() { 32 #ifdef _WIN32 33 ::InitializeCriticalSection(&mLock); 34 #else 35 ::pthread_mutex_init(&mLock, NULL); 36 #endif 37 } 38 39 // Destructor. ~Mutex()40 ~Mutex() { 41 #ifdef _WIN32 42 ::DeleteCriticalSection(&mLock); 43 #else 44 ::pthread_mutex_destroy(&mLock); 45 #endif 46 } 47 48 // Acquire the mutex. lock()49 void lock() { 50 #ifdef _WIN32 51 ::EnterCriticalSection(&mLock); 52 #else 53 ::pthread_mutex_lock(&mLock); 54 #endif 55 } 56 57 // Release the mutex. unlock()58 void unlock() { 59 #ifdef _WIN32 60 ::LeaveCriticalSection(&mLock); 61 #else 62 ::pthread_mutex_unlock(&mLock); 63 #endif 64 } 65 66 // Helper class to lock / unlock a mutex automatically on scope 67 // entry and exit. 68 class AutoLock { 69 public: AutoLock(Mutex & mutex)70 AutoLock(Mutex& mutex) : mMutex(&mutex) { 71 mMutex->lock(); 72 } 73 ~AutoLock()74 ~AutoLock() { 75 mMutex->unlock(); 76 } 77 private: 78 Mutex* mMutex; 79 }; 80 81 private: 82 #ifdef _WIN32 83 CRITICAL_SECTION mLock; 84 #else 85 pthread_mutex_t mLock; 86 #endif 87 88 }; 89 90 } // namespace emugl 91 92 #endif // EMUGL_MUTEX_H 93