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lc-switch.h@0:ee91220d7bea, 2010-11-30 (annotated)

Committer:
taoxh
Date:
Tue Nov 30 23:53:06 2010 +0000
Revision:
0:ee91220d7bea
HW2 PROTOTHREAD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
taoxh 0:ee91220d7bea 1 /*
taoxh 0:ee91220d7bea 2 * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
taoxh 0:ee91220d7bea 3 * All rights reserved.
taoxh 0:ee91220d7bea 4 *
taoxh 0:ee91220d7bea 5 * Redistribution and use in source and binary forms, with or without
taoxh 0:ee91220d7bea 6 * modification, are permitted provided that the following conditions
taoxh 0:ee91220d7bea 7 * are met:
taoxh 0:ee91220d7bea 8 * 1. Redistributions of source code must retain the above copyright
taoxh 0:ee91220d7bea 9 * notice, this list of conditions and the following disclaimer.
taoxh 0:ee91220d7bea 10 * 2. Redistributions in binary form must reproduce the above copyright
taoxh 0:ee91220d7bea 11 * notice, this list of conditions and the following disclaimer in the
taoxh 0:ee91220d7bea 12 * documentation and/or other materials provided with the distribution.
taoxh 0:ee91220d7bea 13 * 3. Neither the name of the Institute nor the names of its contributors
taoxh 0:ee91220d7bea 14 * may be used to endorse or promote products derived from this software
taoxh 0:ee91220d7bea 15 * without specific prior written permission.
taoxh 0:ee91220d7bea 16 *
taoxh 0:ee91220d7bea 17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
taoxh 0:ee91220d7bea 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
taoxh 0:ee91220d7bea 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
taoxh 0:ee91220d7bea 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
taoxh 0:ee91220d7bea 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
taoxh 0:ee91220d7bea 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
taoxh 0:ee91220d7bea 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
taoxh 0:ee91220d7bea 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
taoxh 0:ee91220d7bea 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
taoxh 0:ee91220d7bea 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
taoxh 0:ee91220d7bea 27 * SUCH DAMAGE.
taoxh 0:ee91220d7bea 28 *
taoxh 0:ee91220d7bea 29 * This file is part of the Contiki operating system.
taoxh 0:ee91220d7bea 30 *
taoxh 0:ee91220d7bea 31 * Author: Adam Dunkels <adam@sics.se>
taoxh 0:ee91220d7bea 32 *
taoxh 0:ee91220d7bea 33 * $Id: lc-switch.h,v 1.4 2006/06/03 11:29:43 adam Exp $
taoxh 0:ee91220d7bea 34 */
taoxh 0:ee91220d7bea 35
taoxh 0:ee91220d7bea 36 /**
taoxh 0:ee91220d7bea 37 * \addtogroup lc
taoxh 0:ee91220d7bea 38 * @{
taoxh 0:ee91220d7bea 39 */
taoxh 0:ee91220d7bea 40
taoxh 0:ee91220d7bea 41 /**
taoxh 0:ee91220d7bea 42 * \file
taoxh 0:ee91220d7bea 43 * Implementation of local continuations based on switch() statment
taoxh 0:ee91220d7bea 44 * \author Adam Dunkels <adam@sics.se>
taoxh 0:ee91220d7bea 45 *
taoxh 0:ee91220d7bea 46 * This implementation of local continuations uses the C switch()
taoxh 0:ee91220d7bea 47 * statement to resume execution of a function somewhere inside the
taoxh 0:ee91220d7bea 48 * function's body. The implementation is based on the fact that
taoxh 0:ee91220d7bea 49 * switch() statements are able to jump directly into the bodies of
taoxh 0:ee91220d7bea 50 * control structures such as if() or while() statmenets.
taoxh 0:ee91220d7bea 51 *
taoxh 0:ee91220d7bea 52 * This implementation borrows heavily from Simon Tatham's coroutines
taoxh 0:ee91220d7bea 53 * implementation in C:
taoxh 0:ee91220d7bea 54 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
taoxh 0:ee91220d7bea 55 */
taoxh 0:ee91220d7bea 56
taoxh 0:ee91220d7bea 57 #ifndef __LC_SWITCH_H__
taoxh 0:ee91220d7bea 58 #define __LC_SWITCH_H__
taoxh 0:ee91220d7bea 59
taoxh 0:ee91220d7bea 60 /* WARNING! lc implementation using switch() does not work if an
taoxh 0:ee91220d7bea 61 LC_SET() is done within another switch() statement! */
taoxh 0:ee91220d7bea 62
taoxh 0:ee91220d7bea 63 /** \hideinitializer */
taoxh 0:ee91220d7bea 64 typedef unsigned short lc_t;
taoxh 0:ee91220d7bea 65
taoxh 0:ee91220d7bea 66 #define LC_INIT(s) s = 0;
taoxh 0:ee91220d7bea 67
taoxh 0:ee91220d7bea 68 #define LC_RESUME(s) switch(s) { case 0:
taoxh 0:ee91220d7bea 69
taoxh 0:ee91220d7bea 70 #define LC_SET(s) s = __LINE__; case __LINE__:
taoxh 0:ee91220d7bea 71
taoxh 0:ee91220d7bea 72 #define LC_END(s) }
taoxh 0:ee91220d7bea 73
taoxh 0:ee91220d7bea 74 #endif /* __LC_SWITCH_H__ */
taoxh 0:ee91220d7bea 75
taoxh 0:ee91220d7bea 76 /** @} */