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/* Tell if two mom port references refer to the same channel
Copyright (C) 1996 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "priv.h"
int
mom_ports_identical (struct mom_port_ref *obj1,
struct mom_port_ref *obj2)
{
int ret;
tryagain:
spin_lock (&obj1->lock);
if (!spin_try_lock (&obj2->lock))
{
spin_unlock (&obj1->lock);
goto tryagain;
}
assert (obj1->refcnt);
assert (obj2->refcnt);
ret = (obj1->port == obj2->port);
spin_unlock (&obj1->lock);
spin_unlock (&obj2->lock);
return ret;
}
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