backend/filehandlecache.h

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/*
  filehandlecache  -  filehandle management and caching

  Copyright (C)         Lumiera.org
    2008,               Christian Thaeter <ct@pipapo.org>

  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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef LUMIERA_FILEHANDLECACHE_H
#define LUMIERA_FILEHANDLECACHE_H

#include "lib/error.h"
#include "lib/mrucache.h"
#include "lib/mutex.h"

typedef struct lumiera_filehandlecache_struct lumiera_filehandlecache;
typedef lumiera_filehandlecache* LumieraFilehandlecache;

#include "backend/filehandle.h"

/*
  File handle cache manages file handles
 */
struct lumiera_filehandlecache_struct
{
  lumiera_mrucache cache;
  int available;
  int checked_out;
  lumiera_mutex lock;
};

extern LumieraFilehandlecache lumiera_fhcache;

void
lumiera_filehandlecache_new (int max_entries);

void
lumiera_filehandlecache_delete (void);

LumieraFilehandle
lumiera_filehandlecache_handle_acquire (LumieraFilehandlecache self, LumieraFiledescriptor desc);

LumieraFilehandle
lumiera_filehandlecache_checkout (LumieraFilehandlecache self, LumieraFilehandle handle);

void
lumiera_filehandlecache_checkin (LumieraFilehandlecache self, LumieraFilehandle handle);

#endif

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