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/*
* Copyright (C) 2012 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.
*/
/*
* Encapsulate a mutex for thread synchronization.
*/
#pragma once
#include <pthread.h>
class Mutex
{
public:
/*******************************************************************************
**
** Function: Mutex
**
** Description: Initialize member variables.
**
** Returns: None.
**
*******************************************************************************/
Mutex ();
/*******************************************************************************
**
** Function: ~Mutex
**
** Description: Cleanup all resources.
**
** Returns: None.
**
*******************************************************************************/
~Mutex ();
/*******************************************************************************
**
** Function: lock
**
** Description: Block the thread and try lock the mutex.
**
** Returns: None.
**
*******************************************************************************/
void lock ();
/*******************************************************************************
**
** Function: unlock
**
** Description: Unlock a mutex to unblock a thread.
**
** Returns: None.
**
*******************************************************************************/
void unlock ();
/*******************************************************************************
**
** Function: tryLock
**
** Description: Try to lock the mutex.
**
** Returns: True if the mutex is locked.
**
*******************************************************************************/
bool tryLock ();
/*******************************************************************************
**
** Function: nativeHandle
**
** Description: Get the handle of the mutex.
**
** Returns: Handle of the mutex.
**
*******************************************************************************/
pthread_mutex_t* nativeHandle ();
class Autolock {
public:
inline Autolock(Mutex& mutex) : mLock(mutex) { mLock.lock(); }
inline Autolock(Mutex* mutex) : mLock(*mutex) { mLock.lock(); }
inline ~Autolock() { mLock.unlock(); }
private:
Mutex& mLock;
};
private:
pthread_mutex_t mMutex;
};
typedef Mutex::Autolock AutoMutex;
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