Integrate SIGNAL session into PD session

This patch removes the SIGNAL service from core and moves its
functionality to the PD session. Furthermore, it unifies the PD service
implementation and terminology across the various base platforms.

Issue #1841

repos/base/include/signal_source/rpc_object.h

@@ -0,0 +1,28 @@
+/*
+ * \brief  Server-side signal-source interface
+ * \author Norman Feske
+ * \date   2011-04-12
+ *
+ * This class solely exists as a hook to insert platform-specific
+ * implementation bits (i.e., for the NOVA base platform, there exists
+ * an enriched version of this class).
+ */
+
+/*
+ * Copyright (C) 2011-2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__SIGNAL_SOURCE__RPC_OBJECT_H_
+#define _INCLUDE__SIGNAL_SOURCE__RPC_OBJECT_H_
+
+#include <base/rpc_server.h>
+#include <signal_source/signal_source.h>
+
+namespace Genode { struct Signal_source_rpc_object; }
+
+struct Genode::Signal_source_rpc_object : Rpc_object<Signal_source> { };
+
+#endif /* _INCLUDE__SIGNAL_SOURCE__RPC_OBJECT_H_ */