/*

 * Copyright (c) 2004-2005, Swedish Institute of Computer Science.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the Institute nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * This file is part of the uIP TCP/IP stack

 *

 * Author: Adam Dunkels <adam@sics.se>

 *

 */

/**

 * \addtogroup lc

 * @{

 */

/**

 * \file

 * Implementation of local continuations based on the "Labels as

 * values" feature of gcc

 * \author

 * Adam Dunkels <adam@sics.se>

 *

 * This implementation of local continuations is based on a special

 * feature of the GCC C compiler called "labels as values". This

 * feature allows assigning pointers with the address of the code

 * corresponding to a particular C label.

 *

 * For more information, see the GCC documentation:

 * http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html

 *

 * Thanks to dividuum for finding the nice local scope label

 * implementation.

 */

#ifndef __LC_ADDRLABELS_H__

#define __LC_ADDRLABELS_H__

/** \hideinitializer */

#define LC_INIT(s)	(s = NULL)

#define LC_RESUME(s)			\

	do {				\

		if (s != NULL) {	\

			goto *s;	\

		}			\

	} while (0)

#define LC_SET(s)                               \

	do { ({ __label__ resume; resume: (s) = &&resume; }); } while (0)

#define LC_END(s)

#endif /* __LC_ADDRLABELS_H__ */

/**  @} */