1 files changed, 53 insertions, 0 deletions
diff --git a/libports/port-deref.c b/libports/port-deref.c
new file mode 100644
index 00000000..a1238315
--- /dev/null
+++ b/libports/port-deref.c
@@ -0,0 +1,53 @@
+/* 
+   Copyright (C) 1995 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 <cthreads.h>
+#include <assert.h>
+
+void
+ports_port_deref (void *portstruct)
+{
+  struct port_info *pi = portstruct;
+  int trieddroppingweakrefs = 0;
+
+ retry:
+  
+  mutex_lock (&_ports_lock);
+  
+  if (pi->refcnt == 1 && pi->weakrefcnt && !trieddroppingweakrefs)
+    {
+      mutex_unlock (&_ports_lock);
+      if (pi->class->dropweak_routine)
+	(*pi->class->dropweak_routine) (pi);
+      trieddroppingweakrefs = 1;
+      goto retry;
+    }
+  
+  assert (pi->refcnt);
+
+  pi->refcnt--;
+  if (pi->refcnt == 0 && pi->weakrefcnt == 0)
+    _ports_complete_deallocate (pi);
+  else
+    mutex_unlock (&_ports_lock);
+}
+
+