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lc-addrlabels.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-addrlabels.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 the "Labels as
taoxh 0:ee91220d7bea 44 * values" feature of gcc
taoxh 0:ee91220d7bea 45 * \author
taoxh 0:ee91220d7bea 46 * Adam Dunkels <adam@sics.se>
taoxh 0:ee91220d7bea 47 *
taoxh 0:ee91220d7bea 48 * This implementation of local continuations is based on a special
taoxh 0:ee91220d7bea 49 * feature of the GCC C compiler called "labels as values". This
taoxh 0:ee91220d7bea 50 * feature allows assigning pointers with the address of the code
taoxh 0:ee91220d7bea 51 * corresponding to a particular C label.
taoxh 0:ee91220d7bea 52 *
taoxh 0:ee91220d7bea 53 * For more information, see the GCC documentation:
taoxh 0:ee91220d7bea 54 * http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
taoxh 0:ee91220d7bea 55 *
taoxh 0:ee91220d7bea 56 */
taoxh 0:ee91220d7bea 57
taoxh 0:ee91220d7bea 58 #ifndef __LC_ADDRLABELS_H__
taoxh 0:ee91220d7bea 59 #define __LC_ADDRLABELS_H__
taoxh 0:ee91220d7bea 60
taoxh 0:ee91220d7bea 61 /** \hideinitializer */
taoxh 0:ee91220d7bea 62 typedef void * lc_t;
taoxh 0:ee91220d7bea 63
taoxh 0:ee91220d7bea 64 #define LC_INIT(s) s = NULL
taoxh 0:ee91220d7bea 65
taoxh 0:ee91220d7bea 66 #define LC_RESUME(s) \
taoxh 0:ee91220d7bea 67 do { \
taoxh 0:ee91220d7bea 68 if(s != NULL) { \
taoxh 0:ee91220d7bea 69 goto *s; \
taoxh 0:ee91220d7bea 70 } \
taoxh 0:ee91220d7bea 71 } while(0)
taoxh 0:ee91220d7bea 72
taoxh 0:ee91220d7bea 73 #define LC_CONCAT2(s1, s2) s1##s2
taoxh 0:ee91220d7bea 74 #define LC_CONCAT(s1, s2) LC_CONCAT2(s1, s2)
taoxh 0:ee91220d7bea 75
taoxh 0:ee91220d7bea 76 #define LC_SET(s) \
taoxh 0:ee91220d7bea 77 do { \
taoxh 0:ee91220d7bea 78 LC_CONCAT(LC_LABEL, __LINE__): \
taoxh 0:ee91220d7bea 79 (s) = &&LC_CONCAT(LC_LABEL, __LINE__); \
taoxh 0:ee91220d7bea 80 } while(0)
taoxh 0:ee91220d7bea 81
taoxh 0:ee91220d7bea 82 #define LC_END(s)
taoxh 0:ee91220d7bea 83
taoxh 0:ee91220d7bea 84 #endif /* __LC_ADDRLABELS_H__ */
taoxh 0:ee91220d7bea 85 /** @} */