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/*
(c) Copyright 2001-2009 The world wide DirectFB Open Source Community (directfb.org)
(c) Copyright 2000-2004 Convergence (integrated media) GmbH
All rights reserved.
Written by Denis Oliver Kropp <dok@directfb.org>,
Andreas Hundt <andi@fischlustig.de>,
Sven Neumann <neo@directfb.org>,
Ville Syrjälä <syrjala@sci.fi> and
Claudio Ciccani <klan@users.sf.net>.
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 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.
*/
#ifndef __FUSION__REF_H__
#define __FUSION__REF_H__
#include <pthread.h>
#include <fusion/types.h>
#include <fusion/call.h>
#include <fusion/lock.h>
typedef union {
/* multi app */
struct {
int id;
const FusionWorldShared *shared;
FusionID creator;
/* builtin impl */
struct {
int local;
int global;
FusionSkirmish lock;
FusionCall *call;
int call_arg;
} builtin;
} multi;
/* single app */
struct {
int refs;
pthread_cond_t cond;
pthread_mutex_t lock;
bool destroyed;
int locked;
FusionCall *call;
int call_arg;
} single;
} FusionRef;
/*
* Initialize.
*/
DirectResult fusion_ref_init (FusionRef *ref,
const char *name,
const FusionWorld *world);
DirectResult fusion_ref_set_name (FusionRef *ref,
const char *name);
/*
* Lock, increase, unlock.
*/
DirectResult fusion_ref_up (FusionRef *ref, bool global);
/*
* Lock, decrease, unlock.
*/
DirectResult fusion_ref_down (FusionRef *ref, bool global);
/*
* Get the current reference count. Meant for debugging only.
* This value is not reliable, because no locking will be performed
* and the value may change after or even while returning it.
*/
DirectResult fusion_ref_stat (FusionRef *ref, int *refs);
/*
* Wait for zero and lock.
*/
DirectResult fusion_ref_zero_lock (FusionRef *ref);
/*
* Check for zero and lock if true.
*/
DirectResult fusion_ref_zero_trylock (FusionRef *ref);
/*
* Unlock the counter.
* Only to be called after successful zero_lock or zero_trylock.
*/
DirectResult fusion_ref_unlock (FusionRef *ref);
/*
* Have the call executed when reference counter reaches zero.
*/
DirectResult fusion_ref_watch (FusionRef *ref,
FusionCall *call,
int call_arg);
/*
* Inherit local reference count from another reference.
*
* The local count of the other reference (and its inherited references) is added to this reference.
*/
DirectResult fusion_ref_inherit (FusionRef *ref,
FusionRef *from);
/*
* Deinitialize.
* Can be called after successful zero_lock or zero_trylock
* so that waiting fusion_ref_up calls return with DR_DESTROYED.
*/
DirectResult fusion_ref_destroy (FusionRef *ref);
#endif
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