1 files changed, 65 insertions, 0 deletions
diff --git a/libports/inhibit-port-rpcs.c b/libports/inhibit-port-rpcs.c
new file mode 100644
index 00000000..4ec5d853
--- /dev/null
+++ b/libports/inhibit-port-rpcs.c
@@ -0,0 +1,65 @@
+/*
+   Copyright (C) 1995, 1996 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 <hurd.h>
+#include <cthreads.h>
+
+error_t
+ports_inhibit_port_rpcs (void *portstruct)
+{
+  error_t err = 0;
+  struct port_info *pi = portstruct;
+
+  mutex_lock (&_ports_lock);
+
+  if (pi->flags & (PORT_INHIBITED | PORT_INHIBIT_WAIT))
+    err = EBUSY;
+  else
+    {
+      struct rpc_info *rpc;
+      struct rpc_info *this_rpc = 0;
+  
+      for (rpc = pi->current_rpcs; rpc; rpc = rpc->next)
+	if (hurd_thread_cancel (rpc->thread) == EINTR)
+	  this_rpc = rpc;
+
+      while (pi->current_rpcs
+	     /* If this thread's RPC is the only one left, it doesn't count. */
+	     && !(pi->current_rpcs == this_rpc && ! this_rpc->next))
+	{
+	  pi->flags |= PORT_INHIBIT_WAIT;
+	  if (hurd_condition_wait (&_ports_block, &_ports_lock))
+	    /* We got cancelled.  */
+	    {
+	      err = EINTR;
+	      break;
+	    }
+	}
+
+      pi->flags &= ~PORT_INHIBIT_WAIT;
+      if (! err)
+	pi->flags |= PORT_INHIBITED;
+    }
+
+  mutex_unlock (&_ports_lock);
+
+  return err;
+}