/* * Copyright (C) 2004  Dizzy  * * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. *//* * Reference Change Mechanism * an abstract interface to implement safe management of references of objects  * which do not share any specific dependencies */#ifndef __RCM_H_TYPES__#define __RCM_H_TYPES__#include "common/elist.h"/* reference change mechanism main object * an object which wishes to be referenced using RCM has to include this */typedef struct {    unsigned count;    t_elist refs;	/* list of registered references */} t_rcm;/* callback called when the object referenced is moved/deleted */typedef int (*t_chref_cb)(void *data, void *newref);/* registered reference object * an object which wants to register it's references to an rcm enabled object * will have to include one of this for every rcm enabled referenced object */typedef struct {    t_chref_cb chref;    void *data;    t_elist refs_link;} t_rcm_regref;#endif /* __RCM_H_TYPES__ */#ifndef __RCM_H_PROTOS__#define __RCM_H_PROTOS__extern void rcm_init(t_rcm *rcm);extern void rcm_regref_init(t_rcm_regref *regref, t_chref_cb cb, void *data);extern void rcm_get(t_rcm *rcm, t_rcm_regref *regref);extern void rcm_put(t_rcm *rcm, t_rcm_regref *regref);/* the main function, cycles through the registered references and calls the  * registered callback with the new reference */extern void rcm_chref(t_rcm *rcm, void *newref);#endif /* __RCM_H_PROTOS__ */