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/* |
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* Copyright (c) 2004-2005, Swedish Institute of Computer Science. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the Institute nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* This file is part of the uIP TCP/IP stack |
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* |
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* Author: Adam Dunkels <adam@sics.se> |
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* |
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* $Id: lc-switch.h,v 1.2 2006/06/12 08:00:30 adam Exp $ |
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*/ |
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/** |
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* \addtogroup lc |
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* @{ |
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*/ |
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/** |
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* \file |
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* Implementation of local continuations based on switch() statment |
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* \author Adam Dunkels <adam@sics.se> |
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* |
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* This implementation of local continuations uses the C switch() |
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* statement to resume execution of a function somewhere inside the |
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* function's body. The implementation is based on the fact that |
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* switch() statements are able to jump directly into the bodies of |
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* control structures such as if() or while() statmenets. |
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* |
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* This implementation borrows heavily from Simon Tatham's coroutines |
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* implementation in C: |
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* http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html |
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*/ |
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#ifndef __LC_SWITCH_H__ |
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#define __LC_SWTICH_H__ |
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/* WARNING! lc implementation using switch() does not work if an |
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LC_SET() is done within another switch() statement! */ |
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/** \hideinitializer */ |
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typedef unsigned short lc_t; |
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#define LC_INIT(s) s = 0; |
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#define LC_RESUME(s) switch(s) { case 0: |
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#define LC_SET(s) s = __LINE__; case __LINE__: |
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#define LC_END(s) } |
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#endif /* __LC_SWITCH_H__ */ |
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/** @} */ |
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