2 * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 * 3. Neither the name of the Institute nor the names of its contributors
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14 * may be used to endorse or promote products derived from this software
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15 * without specific prior written permission.
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17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * This file is part of the uIP TCP/IP stack
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31 * Author: Adam Dunkels <adam@sics.se>
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33 * $Id: lc-switch.h,v 1.2 2006/06/12 08:00:30 adam Exp $
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43 * Implementation of local continuations based on switch() statment
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44 * \author Adam Dunkels <adam@sics.se>
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46 * This implementation of local continuations uses the C switch()
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47 * statement to resume execution of a function somewhere inside the
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48 * function's body. The implementation is based on the fact that
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49 * switch() statements are able to jump directly into the bodies of
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50 * control structures such as if() or while() statmenets.
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52 * This implementation borrows heavily from Simon Tatham's coroutines
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53 * implementation in C:
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54 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
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57 #ifndef __LC_SWITCH_H__
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58 #define __LC_SWTICH_H__
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60 /* WARNING! lc implementation using switch() does not work if an
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61 LC_SET() is done within another switch() statement! */
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63 /** \hideinitializer */
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64 typedef unsigned short lc_t;
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66 #define LC_INIT(s) s = 0;
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68 #define LC_RESUME(s) switch(s) { case 0:
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70 #define LC_SET(s) s = __LINE__; case __LINE__:
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74 #endif /* __LC_SWITCH_H__ */
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