[fnordlicht-mini] / firmware / common / pt / lc-switch.h

/*
 * 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 Contiki operating system.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 * $Id: lc-switch.h,v 1.4 2006/06/03 11:29:43 adam Exp $
 */

/**
 * \addtogroup lc
 * @{
 */

/**
 * \file
 * Implementation of local continuations based on switch() statment
 * \author Adam Dunkels <adam@sics.se>
 *
 * This implementation of local continuations uses the C switch()
 * statement to resume execution of a function somewhere inside the
 * function's body. The implementation is based on the fact that
 * switch() statements are able to jump directly into the bodies of
 * control structures such as if() or while() statmenets.
 *
 * This implementation borrows heavily from Simon Tatham's coroutines
 * implementation in C:
 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
 */

#ifndef __LC_SWITCH_H__
#define __LC_SWITCH_H__

/* WARNING! lc implementation using switch() does not work if an
   LC_SET() is done within another switch() statement! */

/** \hideinitializer */
typedef unsigned short lc_t;

#define LC_INIT(s) s = 0;

#define LC_RESUME(s) switch(s) { case 0:

#define LC_SET(s) s = __LINE__; case __LINE__:

#define LC_END(s) }

#endif /* __LC_SWITCH_H__ */

/** @} */
Commit	Line	Data
ec1bef8e	1	/*
	2	* Copyright (c) 2004-2005, Swedish Institute of Computer Science.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the name of the Institute nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*
	29	* This file is part of the Contiki operating system.
	30	*
	31	* Author: Adam Dunkels <adam@sics.se>
	32	*
	33	* $Id: lc-switch.h,v 1.4 2006/06/03 11:29:43 adam Exp $
	34	*/
	35
	36	/**
	37	* \addtogroup lc
	38	* @{
	39	*/
	40
	41	/**
	42	* \file
	43	* Implementation of local continuations based on switch() statment
	44	* \author Adam Dunkels <adam@sics.se>
	45	*
	46	* This implementation of local continuations uses the C switch()
	47	* statement to resume execution of a function somewhere inside the
	48	* function's body. The implementation is based on the fact that
	49	* switch() statements are able to jump directly into the bodies of
	50	* control structures such as if() or while() statmenets.
	51	*
	52	* This implementation borrows heavily from Simon Tatham's coroutines
	53	* implementation in C:
	54	* http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
	55	*/
	56
	57	#ifndef __LC_SWITCH_H__
	58	#define __LC_SWITCH_H__
	59
	60	/* WARNING! lc implementation using switch() does not work if an
	61	LC_SET() is done within another switch() statement! */
	62
	63	/** \hideinitializer */
	64	typedef unsigned short lc_t;
65
66	#define LC_INIT(s) s = 0;
67
68	#define LC_RESUME(s) switch(s) { case 0:
69
70	#define LC_SET(s) s = __LINE__; case __LINE__:
71
72	#define LC_END(s) }
73
74	#endif /* __LC_SWITCH_H__ */
75
76	/** @} */