//
// OpenThread library, Copyright (C) 2002 - 2003  The Open Thread Group
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
// 

// SharedArena.h - Facilities for creating/destroying shared arenas
// ~~~~~~~~~~~~~

#ifndef _SHAREDARENA_H_
#define _SHAREDARENA_H_

#include <unistd.h>
#include <ulocks.h>
#include <errno.h>
#include <assert.h>

namespace OpenThreads {

#define OT_USESHAREDONLY

class SharedArena {

    friend class Mutex;

    friend class Barrier;

    friend class Condition;

private:

    static void initArena();  

    static void removeArena(); 
 
    static ulock_t allocLock();

    static barrier_t *allocBarrier();

    static usema_t *allocSema();

    static int getSemaFd(usema_t *sema);

    static int pSema(usema_t *sema);

    static int vSema(usema_t *sema);

    static int testSema(usema_t *sema);

    static int closeSemaFd(usema_t *sema);
    
    static int freeSema(usema_t *sema);

    static int lock(ulock_t lock);

    static int unlock(ulock_t lock);

    static int trylock(ulock_t lock);

    static void deleteLock(ulock_t lock);

    static void initBarrier(barrier_t *b);

    static void freeBarrier(barrier_t *b);
    
    static void block(barrier_t *b, unsigned int n);
      
private:

    static usptr_t *_arena;

    static int _numLocks;

    static char *_arenaName;
};

}

#endif // !_SHAREDARENA_H_