Initial revision

1 files changed, 43 insertions, 0 deletions

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;
+}