82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/*
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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 Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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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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* \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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#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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#define LC_INIT(s) s = NULL
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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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#define LC_SET(s) \
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do { ({ __label__ resume; resume: (s) = &&resume; }); }while(0)
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#define LC_END(s)
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#endif /* LC_ADDRLABELS_H_ */
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/** @} */
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