genode/base/include/signal_session/source.h

/*
 * \brief  Signal-source interface
 * \author Norman Feske
 * \date   2010-02-03
 *
 * This file is only included by 'signal_session/signal_session.h' and relies
 * on the headers included there. No include guards are needed. It is a
 * separate header file to make it easily replaceable by a platform-specific
 * implementation.
 */

/*
 * Copyright (C) 2010-2011 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_SESSION__SOURCE_H_
#define _INCLUDE__SIGNAL_SESSION__SOURCE_H_

#include <base/rpc.h>

namespace Genode {

	/**
	 * Blocking part of the signal-session interface
	 *
	 * The blocking 'wait_for_signal()' function cannot be part of the
	 * signal-session interface because otherwise, context allocations or
	 * signal submissions would not be possible while blocking for signals.
	 * Therefore, the blocking part is implemented a separate interface,
	 * which can be used by an independent thread.
	 */
	struct Signal_source
	{
		class Signal
		{
			private:

				long _imprint;
				int  _num;

			public:

				Signal(long imprint, int num) :
					_imprint(imprint),
					_num(num)
				{ }

				Signal() : _imprint(0), _num(0) { }

				long imprint() { return _imprint; }

				int num() { return _num; }
		};

		virtual ~Signal_source() { }

		/**
		 * Wait for signal
		 */
		virtual Signal wait_for_signal() = 0;


		/*********************
		 ** RPC declaration **
		 *********************/

		GENODE_RPC(Rpc_wait_for_signal, Signal, wait_for_signal);
		GENODE_RPC_INTERFACE(Rpc_wait_for_signal);
	};
}

#endif /* _INCLUDE__SIGNAL_SESSION__SOURCE_H_ */