/*
 * \brief  Io receptor registry
 * \author Josef Soentgen
 * \date   2012-10-05
 */

/*
 * Copyright (C) 2012-2013 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 _NOUX__IO_RECEPTOR_REGISTRY_H_
#define _NOUX__IO_RECEPTOR_REGISTRY_H_

/* Genode includes */
#include <base/lock.h>
#include <base/semaphore.h>
#include <util/list.h>


namespace Noux {

	struct Io_receptor : List<Io_receptor>::Element
	{
		private:

			Semaphore *_sem;

		public:

			Io_receptor(Semaphore *semaphore)
			:
				_sem(semaphore)
			{ }

			void check_and_wakeup()
			{
				if (_sem)
					_sem->up();
			}
	};

	class Io_receptor_registry
	{
		private:

			List<Io_receptor> _receptors;
			Lock              _receptors_lock;

		public:

			Io_receptor_registry() { }

			~Io_receptor_registry()
			{
				Io_receptor *receptor;
				while ((receptor = _receptors.first()) != 0)
					_receptors.remove(receptor);
			}

			void register_receptor(Io_receptor *receptor)
			{
				Lock::Guard guard(_receptors_lock);

				_receptors.insert(receptor);
			}

			void unregister_receptor(Io_receptor *receptor)
			{
				Lock::Guard guard(_receptors_lock);

				_receptors.remove(receptor);
			}

			Io_receptor *first() { return _receptors.first(); }

	};

}

#endif /* _NOUX__IO_RECEPTOR_REGISTRY_H_ */