/*
* The Mana Client
* Copyright (C) 2008-2009 The Mana World Development Team
* Copyright (C) 2009-2012 The Mana Developers
*
* This file is part of The Mana Client.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#pragma once
#include "log.h"
#include
/**
* A mutex provides mutual exclusion of access to certain data that is
* accessed by multiple threads.
*/
class Mutex
{
public:
Mutex();
~Mutex();
Mutex(Mutex&&) = delete; // prevent moving
Mutex(const Mutex&) = delete; // prevent copying
Mutex& operator=(const Mutex&) = delete;
void lock();
void unlock();
private:
SDL_mutex *mMutex;
};
/**
* A convenience class for locking a mutex.
*/
class MutexLocker
{
public:
MutexLocker(Mutex *mutex);
MutexLocker(MutexLocker&&);
MutexLocker(const MutexLocker&) = delete; // prevent copying
MutexLocker& operator=(const MutexLocker&) = delete;
~MutexLocker();
private:
Mutex *mMutex;
};
inline Mutex::Mutex()
{
mMutex = SDL_CreateMutex();
}
inline Mutex::~Mutex()
{
SDL_DestroyMutex(mMutex);
}
inline void Mutex::lock()
{
if (SDL_mutexP(mMutex) == -1)
Log::info("Mutex locking failed: %s", SDL_GetError());
}
inline void Mutex::unlock()
{
if (SDL_mutexV(mMutex) == -1)
Log::info("Mutex unlocking failed: %s", SDL_GetError());
}
inline MutexLocker::MutexLocker(Mutex *mutex):
mMutex(mutex)
{
mMutex->lock();
}
inline MutexLocker::MutexLocker(MutexLocker&& rhs):
mMutex(rhs.mMutex)
{
rhs.mMutex = nullptr;
}
inline MutexLocker::~MutexLocker()
{
if (mMutex)
mMutex->unlock();
}
/**
* A template class for wrapping data that is accessed by multiple threads.
*/
template
class ThreadSafe
{
class Locked : private MutexLocker
{
public:
Locked(T &data, Mutex &mutex)
: MutexLocker(&mutex)
, mData(data)
{}
Locked(Locked&& rhs) = delete;
Locked(const Locked&) = delete;
Locked& operator=(const Locked&) = delete;
Locked& operator=(Locked&&) = delete;
T &operator*() const { return mData; }
T *operator->() const { return &mData; }
private:
T &mData;
};
public:
ThreadSafe() = default;
ThreadSafe(const T &data)
: mData(data)
{}
Locked lock() { return { mData, mMutex }; }
private:
T mData;
Mutex mMutex;
};