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/*
Copyright (C) 1995, 2001 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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 "ports.h"
#include <assert.h>
void
ports_port_deref (void *portstruct)
{
struct port_info *pi = portstruct;
struct references result;
if (pi->class->dropweak_routine)
{
/* If we need to call the dropweak routine, we need to hold one
reference while doing so. We use a weak reference for this
purpose, which we acquire by demoting our hard reference to a
weak one. */
refcounts_demote (&pi->refcounts, &result);
if (result.hard == 0 && result.weak > 1)
(*pi->class->dropweak_routine) (pi);
refcounts_deref_weak (&pi->refcounts, &result);
}
else
refcounts_deref (&pi->refcounts, &result);
if (result.hard == 0 && result.weak == 0)
_ports_complete_deallocate (pi);
}
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