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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-switch.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 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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