| /* |
| * Copyright (C) 2015 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 MUTEX_H_ |
| #define MUTEX_H_ |
| |
| #include "pthread.h" |
| |
| // Based on utils/threads.h, but tailored to build with the NDK and used unbundled. |
| // This is a simple wrapper over the pthread_mutex_t type. |
| class Mutex { |
| public: |
| Mutex() { |
| pthread_mutex_init(&mMutex, NULL); |
| } |
| int lock() { |
| return -pthread_mutex_lock(&mMutex); |
| } |
| void unlock() { |
| pthread_mutex_unlock(&mMutex); |
| } |
| ~Mutex() { |
| pthread_mutex_destroy(&mMutex); |
| } |
| |
| // A simple class that locks a given mutex on construction |
| // and unlocks it when it goes out of scope. |
| class Autolock { |
| public: |
| Autolock(Mutex &mutex) : lock(&mutex) { |
| lock->lock(); |
| } |
| ~Autolock() { |
| lock->unlock(); |
| } |
| private: |
| Mutex *lock; |
| }; |
| |
| private: |
| pthread_mutex_t mMutex; |
| |
| // Disallow copy and assign. |
| Mutex(const Mutex&); |
| Mutex& operator=(const Mutex&); |
| }; |
| |
| #endif // MUTEX_H_ |