[101] | 1 | /*
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| 2 | * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
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| 3 | * All rights reserved.
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| 4 | *
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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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| 7 | * are met:
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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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| 16 | *
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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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| 27 | * SUCH DAMAGE.
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| 28 | *
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| 29 | * This file is part of the uIP TCP/IP stack
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| 30 | *
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| 31 | * Author: Adam Dunkels <adam@sics.se>
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| 32 | *
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| 33 | * $Id: lc-switch.h 157 2016-02-20 11:16:05Z coas-nagasima $
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| 34 | */
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| 35 |
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| 36 | /**
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| 37 | * \addtogroup lc
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| 38 | * @{
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| 39 | */
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| 40 |
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| 41 | /**
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| 42 | * \file
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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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| 45 | *
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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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| 51 | *
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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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| 55 | */
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| 56 |
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| 57 | #ifndef __LC_SWITCH_H__
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| 58 | #define __LC_SWITCH_H__
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| 59 |
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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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| 62 |
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| 63 | /** \hideinitializer */
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| 64 | typedef unsigned short lc_t;
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| 65 |
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| 66 | #define LC_INIT(s) s = 0;
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| 67 |
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| 68 | #define LC_RESUME(s) switch(s) { case 0:
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| 69 |
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| 70 | #define LC_SET(s) s = __LINE__; case __LINE__:
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| 71 |
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| 72 | #define LC_END(s) break; }
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| 73 |
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| 74 | #endif /* __LC_SWITCH_H__ */
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| 75 |
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| 76 | /** @} */
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