| /* | |
| * 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> | |
| * | |
| * $Id: lc-switch.h,v 1.2 2006/06/12 08:00:30 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_SWTICH_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__ */ | |
| /** @} */ |