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powerman.h

/* 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-0-0rc1/backends/platform/psp/powerman.h $
 * $Id: powerman.h 43493 2009-08-17 20:10:00Z joostp $
 *
 */

#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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