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ps2mutex.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2005-2006 The ScummVM project
 *
 * 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://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/ps2/ps2mutex.cpp $
 * $Id: ps2mutex.cpp 22975 2006-06-07 06:57:46Z lavosspawn $
 *
 */

#include "backends/ps2/systemps2.h"

OSystem::MutexRef OSystem_PS2::createMutex(void) {
      WaitSema(_mutexSema);
      Ps2Mutex *mutex = NULL;
      for (int i = 0; i < MAX_MUTEXES; i++)
            if (_mutex[i].sema < 0) {
                  mutex = _mutex + i;
                  break;
            }
      if (mutex) {
            ee_sema_t newSema;
            newSema.init_count = 1;
            newSema.max_count = 1;
            mutex->sema = CreateSema(&newSema);
            mutex->owner = mutex->count = 0;
      } else
            printf("OSystem_PS2::createMutex: ran out of Mutex slots!\n");
      SignalSema(_mutexSema);
      return (OSystem::MutexRef)mutex;
}

void OSystem_PS2::lockMutex(MutexRef mutex) {
      WaitSema(_mutexSema);
      Ps2Mutex *sysMutex = (Ps2Mutex*)mutex;
      int tid = GetThreadId();
      assert(tid != 0);
      if (sysMutex->owner && (sysMutex->owner == tid))
            sysMutex->count++;
      else {
            SignalSema(_mutexSema);
            WaitSema(sysMutex->sema);
            WaitSema(_mutexSema);
            sysMutex->owner = tid;
            sysMutex->count = 0;
      }
      SignalSema(_mutexSema);
}

void OSystem_PS2::unlockMutex(MutexRef mutex) {
      WaitSema(_mutexSema);
      Ps2Mutex *sysMutex = (Ps2Mutex*)mutex;
      int tid = GetThreadId();
      if (sysMutex->owner && sysMutex->count && (sysMutex->owner == tid))
            sysMutex->count--;
      else {
            assert(sysMutex->count == 0);
            SignalSema(sysMutex->sema);
            sysMutex->owner = 0;
      }
      SignalSema(_mutexSema);
}

void OSystem_PS2::deleteMutex(MutexRef mutex) {
      WaitSema(_mutexSema);
      Ps2Mutex *sysMutex = (Ps2Mutex*)mutex;
      if (sysMutex->owner || sysMutex->count)
            printf("WARNING: Deleting LOCKED mutex!\n");
      DeleteSema(sysMutex->sema);
      sysMutex->sema = -1;
      SignalSema(_mutexSema);
}


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