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powerman.cpp

/* 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.cpp $
 * $Id: powerman.cpp 43493 2009-08-17 20:10:00Z joostp $
 *
 */

#include "./powerman.h"
#include "./trace.h"

DECLARE_SINGLETON(PowerManager);

 /*******************************************
*
*     Constructor
*
********************************************/ 
PowerManager::PowerManager() {
      _flagMutex = NULL;                              /* Init mutex handle */
      _listMutex = NULL;                              /* Init mutex handle */
      _condSuspendable = NULL;                  /* Init condition variable */
      _condPM = NULL;
      
      _condSuspendable = SDL_CreateCond();
      if (_condSuspendable <= 0) {
            PSPDebugTrace("PowerManager::PowerManager(): Couldn't create condSuspendable\n");
      }
      
      _condPM = SDL_CreateCond();
      if (_condPM <= 0) {
            PSPDebugTrace("PowerManager::PowerManager(): Couldn't create condPM\n");
      }

      _flagMutex = SDL_CreateMutex();
      if (_flagMutex <= 0) {
            PSPDebugTrace("PowerManager::PowerManager(): Couldn't create flagMutex\n");
      }

      _listMutex = SDL_CreateMutex();
      if (_listMutex <= 0) {
            PSPDebugTrace("PowerManager::PowerManager(): Couldn't create listMutex\n");
      }

      _suspendFlag = false;
      _criticalCounter = 0;
 }
 
/*******************************************
*
*     Function to register to be notified when suspend/resume time comes
*
********************************************/ 
int PowerManager::registerSuspend(Suspendable *item) {
      // Register in list
      PSPDebugTrace("In registerSuspend\n");

      if (SDL_mutexP(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::registerSuspend(): Couldn't lock _listMutex %d\n", _listMutex);
      }

      _suspendList.push_front(item);

      if (SDL_mutexV(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::registerSuspend(): Couldn't unlock _listMutex %d\n", _listMutex);
      }

      PSPDebugTrace("Out of registerSuspend\n");

      return 0;
}

/*******************************************
*
*     Function to unregister to be notified when suspend/resume time comes
*
********************************************/  
int PowerManager::unregisterSuspend(Suspendable *item) {

      PSPDebugTrace("In unregisterSuspend\n");

       // Unregister from stream list
      if (SDL_mutexP(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::unregisterSuspend(): Couldn't unlock _listMutex %d\n", _listMutex);
      }

      _suspendList.remove(item);

      if (SDL_mutexV(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::unregisterSuspend(): Couldn't unlock _listMutex %d\n", _listMutex);
      }

      PSPDebugTrace("Out of unregisterSuspend\n");

      return 0;
 }
 
 /*******************************************
*
*     Destructor
*
********************************************/ 
 PowerManager::~PowerManager() {
      SDL_DestroyCond(_condSuspendable);
      _condSuspendable = 0;
      
      SDL_DestroyCond(_condPM);
      _condPM = 0;

      SDL_DestroyMutex(_flagMutex);
      _flagMutex = 0;

      SDL_DestroyMutex(_listMutex);
      _listMutex = 0;
 }
 
 
 /*******************************************
*
*     Function to be called by threads wanting to block on the PSP entering suspend
*
********************************************/  
 int PowerManager::blockOnSuspend()  {
      return beginCriticalSection(true);
}

 /*
  * Function to block on a suspend, then start a non-suspendable critical section
  */
int PowerManager::beginCriticalSection(bool justBlock) {
      int ret = PowerManager::NotBlocked;

      if (SDL_mutexP(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::blockOnSuspend(): Couldn't lock flagMutex %d\n", _flagMutex);
            ret = PowerManager::Error;
      }

      // Check the access flag
      if (_suspendFlag == true) {
            PSPDebugTrace("Blocking!!\n");
            ret = PowerManager::Blocked;

            // If it's true, we wait for a signal to continue
            if( SDL_CondWait(_condSuspendable, _flagMutex) != 0) {
                  PSPDebugTrace("PowerManager::blockOnSuspend(): Couldn't wait on cond %d\n", _condSuspendable);
            }

            PSPDebugTrace("We got blocked!!\n");
      }
      
      // Now put the pm to sleep
      if (justBlock == false)
            _criticalCounter++;

      if (SDL_mutexV(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::blockOnSuspend(): Couldn't unlock flagMutex %d\n", _flagMutex);
            ret = PowerManager::Error;
      }

      return ret;
}

int PowerManager::endCriticalSection() {
      int ret = 0;

      if (SDL_mutexP(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::endCriticalSection(): Couldn't lock flagMutex %d\n", _flagMutex);
            ret = PowerManager::Error;
      }

      // We're done with our critical section
      _criticalCounter--;
      
      if (_criticalCounter <= 0) {
            if(_suspendFlag == true) PSPDebugTrace("Waking up the PM and suspendFlag is true\n");

            SDL_CondBroadcast(_condPM);

            if (_criticalCounter < 0) {
                  PSPDebugTrace("PowerManager::endCriticalSection(): Error! Critical counter is %d\n", _criticalCounter);
            }
      }

      if (SDL_mutexV(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::endCriticalSection(): Couldn't unlock flagMutex %d\n", _flagMutex);
            ret = PowerManager::Error;
      }

      return ret;
}

 /*******************************************
*
*     Callback function to be called to put every Suspendable to suspend
*
********************************************/  
int PowerManager::suspend() {
      int ret = 0;

      // First we set the suspend flag to true
      if (SDL_mutexP(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::suspend(): Couldn't lock flagMutex %d\n", _flagMutex);
            ret = -1;
      }

      _suspendFlag = true;
      
      if (_criticalCounter > 0)
            SDL_CondWait(_condPM, _flagMutex);

      if (SDL_mutexV(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::suspend(): Couldn't unlock flagMutex %d\n", _flagMutex);
            ret = -1;
      }

      // Loop over list, calling suspend()
      if (SDL_mutexP(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::suspend(): Couldn't lock listMutex %d\n", _listMutex);
            ret = -1;
      }

      Common::List<Suspendable *>::iterator i = _suspendList.begin();

      for (; i != _suspendList.end(); i++) {
            (*i)->suspend();
      }

      if (SDL_mutexV(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::suspend(): Couldn't unlock listMutex %d\n", _listMutex);
            ret = -1;
      }

      return ret;
}

/*******************************************
*
*     Callback function to resume every Suspendable
*
********************************************/  
int PowerManager::resume() {
      int ret = 0;

      // First we notify our Suspendables. Loop over list, calling resume()
      if (SDL_mutexP(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::resume(): Couldn't lock listMutex %d\n", _listMutex);
            ret = -1;
      }

      Common::List<Suspendable *>::iterator i = _suspendList.begin();

      for (; i != _suspendList.end(); i++) {
            (*i)->resume();
      }

      if (SDL_mutexV(_listMutex) != 0) {
            PSPDebugTrace("PowerManager::resume(): Couldn't unlock listMutex %d\n", _listMutex);
            ret = -1;
      }

      // Now we set the suspend flag to false
      if (SDL_mutexP(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::resume(): Couldn't lock flagMutex %d\n", _flagMutex);
            ret = -1;
      }
      _suspendFlag = false;

      // Signal the other threads to wake up
      if (SDL_CondBroadcast(_condSuspendable) != 0) {
            PSPDebugTrace("PowerManager::resume(): Couldn't broadcast condition %d\n", _condSuspendable);
            ret = -1;
      }

      if (SDL_mutexV(_flagMutex) != 0) {
            PSPDebugTrace("PowerManager::resume(): Couldn't unlock flagMutex %d\n", _flagMutex);
            ret = -1;
      }

      return ret;
}

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