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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-addrlabels.h,v 1.3 2006/06/12 08:00:30 adam Exp $ |
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*/ |
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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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/** |
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* \file |
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* Implementation of local continuations based on the "Labels as |
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* values" feature of gcc |
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* \author |
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* Adam Dunkels <adam@sics.se> |
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* |
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* This implementation of local continuations is based on a special |
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* feature of the GCC C compiler called "labels as values". This |
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* feature allows assigning pointers with the address of the code |
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* corresponding to a particular C label. |
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* |
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* For more information, see the GCC documentation: |
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* http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html |
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* |
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* Thanks to dividuum for finding the nice local scope label |
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* implementation. |
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*/ |
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|
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#ifndef __LC_ADDRLABELS_H__ |
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#define __LC_ADDRLABELS_H__ |
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/** \hideinitializer */ |
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typedef void * lc_t; |
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|
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#define LC_INIT(s) s = NULL |
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|
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|
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#define LC_RESUME(s) \ |
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do { \ |
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if(s != NULL) { \ |
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goto *s; \ |
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} \ |
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} while(0) |
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|
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#define LC_SET(s) \ |
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do { ({ __label__ resume; resume: (s) = &&resume; }); }while(0) |
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|
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#define LC_END(s) |
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|
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#endif /* __LC_ADDRLABELS_H__ */ |
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/** @} */ |
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