/*

 * 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 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_SWTICH_H__

/* WARNING! lc implementation using switch() does not work if an

   LC_SET() is done within another switch() statement! */

/** \hideinitializer */

#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__ */

/** @} */