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/*
* 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_
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