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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [uIP/] [uip-1.0/] [uip/] [lc-addrlabels.h] - Blame information for rev 606

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1 606 jeremybenn
/*
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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 2 2011-07-17 20:13:17Z filepang@gmail.com $
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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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