1 files changed, 61 insertions, 0 deletions
diff --git a/libports/no-senders.c b/libports/no-senders.c
new file mode 100644
index 00000000..09a32dfc
--- /dev/null
+++ b/libports/no-senders.c
@@ -0,0 +1,61 @@
+/* 
+   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 <mach/notify.h>
+
+void
+ports_no_senders (void *portstruct,
+		  mach_port_mscount_t mscount)
+{
+  struct port_info *pi = portstruct;
+  int dealloc;
+  mach_port_t old;
+  
+  mutex_lock (&_ports_lock);
+  if ((pi->flags & PORT_HAS_SENDRIGHTS) == 0)
+    {
+      mutex_unlock (&_ports_lock);
+      return;
+    }
+  if (mscount >= pi->mscount)
+    {
+      dealloc = 1;
+      pi->flags &= ~PORT_HAS_SENDRIGHTS;
+    }
+  else
+    {
+      /* Request a new notification.  The sync value is because
+       we might have accounted for a new sender but not actually
+       made the send right yet.  */
+      mach_port_request_notification (mach_task_self (), pi->port_right,
+				      MACH_NOTIFY_NO_SENDERS, pi->mscount,
+				      pi->port_right,
+				      MACH_MSG_TYPE_MAKE_SEND_ONCE, &old);
+      if (old)
+	mach_port_deallocate (mach_task_self (), old);
+      dealloc = 0;
+    }
+  mutex_unlock (&_ports_lock);
+  
+  if (dealloc)
+    ports_port_deref (pi);
+}