From 218d28a051f30d6c80895ab7df23c5bb6d1a6757 Mon Sep 17 00:00:00 2001 From: "Michael I. Bushnell" Date: Fri, 24 May 1996 19:16:10 +0000 Subject: Initial revision --- libmom/refs-identical.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 libmom/refs-identical.c (limited to 'libmom/refs-identical.c') diff --git a/libmom/refs-identical.c b/libmom/refs-identical.c new file mode 100644 index 00000000..74dad9b8 --- /dev/null +++ b/libmom/refs-identical.c @@ -0,0 +1,43 @@ +/* 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; +} -- cgit v1.2.3