/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MUTEX_H_
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#define MUTEX_H_
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#include "pthread.h"
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// Based on utils/threads.h, but tailored to build with the NDK and used unbundled.
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// This is a simple wrapper over the pthread_mutex_t type.
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class Mutex {
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public:
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Mutex() {
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pthread_mutex_init(&mMutex, NULL);
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}
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int lock() {
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return -pthread_mutex_lock(&mMutex);
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}
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void unlock() {
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pthread_mutex_unlock(&mMutex);
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}
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~Mutex() {
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pthread_mutex_destroy(&mMutex);
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}
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// A simple class that locks a given mutex on construction
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// and unlocks it when it goes out of scope.
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class Autolock {
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public:
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Autolock(Mutex &mutex) : lock(&mutex) {
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lock->lock();
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}
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~Autolock() {
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lock->unlock();
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}
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private:
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Mutex *lock;
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};
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private:
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pthread_mutex_t mMutex;
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// Disallow copy and assign.
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Mutex(const Mutex&);
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Mutex& operator=(const Mutex&);
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};
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#endif // MUTEX_H_
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