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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 (at your option) 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef POWERMAN_H
#define POWERMAN_H
#include <SDL/SDL_thread.h>
#include <SDL/SDL_mutex.h>
#include "common/singleton.h"
#include "common/list.h"
/*
* Implement this class (interface) if you want to use PowerManager's suspend callback functionality
*
*/
class Suspendable {
public:
virtual ~Suspendable() {}
virtual int suspend() = 0;
virtual int resume() = 0;
};
/******************************************************************************************************
*
* This class will call a Suspendable when the PSP goes to suspend/resumes. It also provides the ability to block
* a thread when the PSP is going to suspend/suspending, and to wake it up when the PSP is resumed.
* This ability is very useful for managing the PSPIoStream class, but may be found useful by other classes as well.
*
*******************************************************************************************************/
class PowerManager: public Common::Singleton<PowerManager> {
private:
friend class Common::Singleton<PowerManager>;
PowerManager();
~PowerManager();
Common::List<Suspendable *> _suspendList; /* list to register in */
bool _suspendFlag; /* protected variable */
SDL_mutex *_flagMutex; /* mutex to access access flag */
SDL_mutex *_listMutex; /* mutex to access Suspendable list */
SDL_cond *_condSuspendable; /* signal to synchronize accessing threads */
SDL_cond *_condPM; /* signal to wake up the PM from a critical section */
int _criticalCounter; /* Counter of how many threads are in a critical section */
public:
int blockOnSuspend(); /* block if suspending */
int beginCriticalSection(bool justBlock = false); /* Use a critical section to block (if suspend was already pressed) */
int endCriticalSection(); /* and to prevent the PSP from suspending in a particular section */
int registerSuspend(Suspendable *item); /* register to be called to suspend/resume */
int unregisterSuspend(Suspendable *item); /* remove from suspend/resume list */
int suspend(); /* callback to have all items in list suspend */
int resume(); /* callback to have all items in list resume */
enum {
Error = -1,
NotBlocked = 0,
Blocked = 1
};
};
// For easy access
#define PowerMan PowerManager::instance()
#endif /* POWERMAN_H */
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