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/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 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.
*/
#include <assert.h>
#include <gpxe/interface.h>
/** @file
*
* Object communication interfaces
*
*/
/**
* Obtain reference to interface
*
* @v intf Interface
* @ret intf Interface
*
* Increases the reference count on the interface.
*/
static struct interface * intf_get ( struct interface *intf ) {
intf->refcnt ( intf, +1 );
return intf;
}
/**
* Drop reference to interface
*
* @v intf Interface
*
* Decreases the reference count on the interface.
*/
static void intf_put ( struct interface *intf ) {
intf->refcnt ( intf, -1 );
}
/**
* Plug an interface into a new destination interface
*
* @v intf Interface
* @v dest New destination interface
*
* The reference to the existing destination interface is dropped, a
* reference to the new destination interface is obtained, and the
* interface is updated to point to the new destination interface.
*
* Note that there is no "unplug" call; instead you must plug the
* interface into a null interface.
*/
void plug ( struct interface *intf, struct interface *dest ) {
intf_put ( intf->dest );
intf->dest = intf_get ( dest );
}
/**
* Null update reference count
*
* @v intf Interface
* @v delta Change to apply to reference count
*
* Use this as the refcnt() method for an interface that does not need
* to support reference counting.
*/
void null_refcnt ( struct interface *intf __unused, int delta __unused ) {
/* Do nothing */
}
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