// Copyright (C) 2014 The Android Open Source Project // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #ifndef EMUGL_MUTEX_H #define EMUGL_MUTEX_H #ifdef _WIN32 # define WIN32_LEAN_AND_MEAN 1 # include #else # include #endif namespace emugl { class ConditionVariable; // Simple wrapper class for mutexes. class Mutex { public: // Constructor. Mutex() { #ifdef _WIN32 ::InitializeCriticalSection(&mLock); #else ::pthread_mutex_init(&mLock, NULL); #endif } // Destructor. ~Mutex() { #ifdef _WIN32 ::DeleteCriticalSection(&mLock); #else ::pthread_mutex_destroy(&mLock); #endif } // Acquire the mutex. void lock() { #ifdef _WIN32 ::EnterCriticalSection(&mLock); #else ::pthread_mutex_lock(&mLock); #endif } // Release the mutex. void unlock() { #ifdef _WIN32 ::LeaveCriticalSection(&mLock); #else ::pthread_mutex_unlock(&mLock); #endif } // Helper class to lock / unlock a mutex automatically on scope // entry and exit. class AutoLock { public: AutoLock(Mutex& mutex) : mMutex(&mutex) { mMutex->lock(); } ~AutoLock() { mMutex->unlock(); } private: Mutex* mMutex; }; private: #ifdef _WIN32 CRITICAL_SECTION mLock; #else friend class ConditionVariable; pthread_mutex_t mLock; #endif }; } // namespace emugl #endif // EMUGL_MUTEX_H