FreeRTOS/Common/ethernet/FreeTCPIP/net/lc.h

   1 /*
   2  * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * This file is part of the uIP TCP/IP stack
  30  *
  31  * Author: Adam Dunkels <adam@sics.se>
  32  *
  33  * $Id: lc.h,v 1.2 2006/06/12 08:00:30 adam Exp $
  34  */
  35
  36 /**
  37  * \addtogroup pt
  38  * @{
  39  */
  40
  41 /**
  42  * \defgroup lc Local continuations
  43  * @{
  44  *
  45  * Local continuations form the basis for implementing protothreads. A
  46  * local continuation can be <i>set</i> in a specific function to
  47  * capture the state of the function. After a local continuation has
  48  * been set can be <i>resumed</i> in order to restore the state of the
  49  * function at the point where the local continuation was set.
  50  *
  51  *
  52  */
  53
  54 /**
  55  * \file lc.h
  56  * Local continuations
  57  * \author
  58  * Adam Dunkels <adam@sics.se>
  59  *
  60  */
  61
  62 #ifdef DOXYGEN
  63 /**
  64  * Initialize a local continuation.
  65  *
  66  * This operation initializes the local continuation, thereby
  67  * unsetting any previously set continuation state.
  68  *
  69  * \hideinitializer
  70  */
  71 #define LC_INIT(lc)
  72
  73 /**
  74  * Set a local continuation.
  75  *
  76  * The set operation saves the state of the function at the point
  77  * where the operation is executed. As far as the set operation is
  78  * concerned, the state of the function does <b>not</b> include the
  79  * call-stack or local (automatic) variables, but only the program
  80  * counter and such CPU registers that needs to be saved.
  81  *
  82  * \hideinitializer
  83  */
  84 #define LC_SET(lc)
  85
  86 /**
  87  * Resume a local continuation.
  88  *
  89  * The resume operation resumes a previously set local continuation, thus
  90  * restoring the state in which the function was when the local
  91  * continuation was set. If the local continuation has not been
  92  * previously set, the resume operation does nothing.
  93  *
  94  * \hideinitializer
  95  */
  96 #define LC_RESUME(lc)
  97
  98 /**
  99  * Mark the end of local continuation usage.
 100  *
 101  * The end operation signifies that local continuations should not be
 102  * used any more in the function. This operation is not needed for
 103  * most implementations of local continuation, but is required by a
 104  * few implementations.
 105  *
 106  * \hideinitializer
 107  */
 108 #define LC_END(lc)
 109
 110 /**
 111  * \var typedef lc_t;
 112  *
 113  * The local continuation type.
 114  *
 115  * \hideinitializer
 116  */
 117 #endif /* DOXYGEN */
 118
 119 #ifndef __LC_H__
 120 #define __LC_H__
 121
 122 #ifdef LC_CONF_INCLUDE
 123 #include LC_CONF_INCLUDE
 124 #else
 125 #include "lc-switch.h"
 126 #endif /* LC_CONF_INCLUDE */
 127
 128 #endif /* __LC_H__ */
 129
 130 /** @} */
 131 /** @} */