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