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  3. <title>The Protothreads Library 1.4: lc-addrlabels.h Source File</title>
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  20. <h1>lc-addrlabels.h</h1><a href="a00009.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
    21. 

  21. <a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2004-2005, Swedish Institute of Computer Science.</span>
    22. 

  22. <a name="l00003"></a>00003 <span class="comment"> * All rights reserved.</span>
    23. 

  23. <a name="l00004"></a>00004 <span class="comment"> *</span>
    24. 

  24. <a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
    25. 

  25. <a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions</span>
    26. 

  26. <a name="l00007"></a>00007 <span class="comment"> * are met:</span>
    27. 

  27. <a name="l00008"></a>00008 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
    28. 

  28. <a name="l00009"></a>00009 <span class="comment"> *    notice, this list of conditions and the following disclaimer.</span>
    29. 

  29. <a name="l00010"></a>00010 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
    30. 

  30. <a name="l00011"></a>00011 <span class="comment"> *    notice, this list of conditions and the following disclaimer in the</span>
    31. 

  31. <a name="l00012"></a>00012 <span class="comment"> *    documentation and/or other materials provided with the distribution.</span>
    32. 

  32. <a name="l00013"></a>00013 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors</span>
    33. 

  33. <a name="l00014"></a>00014 <span class="comment"> *    may be used to endorse or promote products derived from this software</span>
    34. 

  34. <a name="l00015"></a>00015 <span class="comment"> *    without specific prior written permission.</span>
    35. 

  35. <a name="l00016"></a>00016 <span class="comment"> *</span>
    36. 

  36. <a name="l00017"></a>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND</span>
    37. 

  37. <a name="l00018"></a>00018 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
    38. 

  38. <a name="l00019"></a>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
    39. 

  39. <a name="l00020"></a>00020 <span class="comment"> * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE</span>
    40. 

  40. <a name="l00021"></a>00021 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
    41. 

  41. <a name="l00022"></a>00022 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
    42. 

  42. <a name="l00023"></a>00023 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
    43. 

  43. <a name="l00024"></a>00024 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
    44. 

  44. <a name="l00025"></a>00025 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
    45. 

  45. <a name="l00026"></a>00026 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
    46. 

  46. <a name="l00027"></a>00027 <span class="comment"> * SUCH DAMAGE.</span>
    47. 

  47. <a name="l00028"></a>00028 <span class="comment"> *</span>
    48. 

  48. <a name="l00029"></a>00029 <span class="comment"> * This file is part of the Contiki operating system.</span>
    49. 

  49. <a name="l00030"></a>00030 <span class="comment"> *</span>
    50. 

  50. <a name="l00031"></a>00031 <span class="comment"> * Author: Adam Dunkels &lt;adam@sics.se&gt;</span>
    51. 

  51. <a name="l00032"></a>00032 <span class="comment"> *</span>
    52. 

  52. <a name="l00033"></a>00033 <span class="comment"> * $Id: lc-addrlabels.h,v 1.4 2006/06/03 11:29:43 adam Exp $</span>
    53. 

  53. <a name="l00034"></a>00034 <span class="comment"> */</span>
    54. 

  54. <a name="l00035"></a>00035 <span class="comment"></span>
    55. 

  55. <a name="l00036"></a>00036 <span class="comment">/**</span>
    56. 

  56. <a name="l00037"></a>00037 <span class="comment"> * \addtogroup lc</span>
    57. 

  57. <a name="l00038"></a>00038 <span class="comment"> * @{</span>
    58. 

  58. <a name="l00039"></a>00039 <span class="comment"> */</span>
    59. 

  59. <a name="l00040"></a>00040 <span class="comment"></span>
    60. 

  60. <a name="l00041"></a>00041 <span class="comment">/**</span>
    61. 

  61. <a name="l00042"></a>00042 <span class="comment"> * \file</span>
    62. 

  62. <a name="l00043"></a>00043 <span class="comment"> * Implementation of local continuations based on the "Labels as</span>
    63. 

  63. <a name="l00044"></a>00044 <span class="comment"> * values" feature of gcc</span>
    64. 

  64. <a name="l00045"></a>00045 <span class="comment"> * \author</span>
    65. 

  65. <a name="l00046"></a>00046 <span class="comment"> * Adam Dunkels &lt;adam@sics.se&gt;</span>
    66. 

  66. <a name="l00047"></a>00047 <span class="comment"> *</span>
    67. 

  67. <a name="l00048"></a>00048 <span class="comment"> * This implementation of local continuations is based on a special</span>
    68. 

  68. <a name="l00049"></a>00049 <span class="comment"> * feature of the GCC C compiler called "labels as values". This</span>
    69. 

  69. <a name="l00050"></a>00050 <span class="comment"> * feature allows assigning pointers with the address of the code</span>
    70. 

  70. <a name="l00051"></a>00051 <span class="comment"> * corresponding to a particular C label.</span>
    71. 

  71. <a name="l00052"></a>00052 <span class="comment"> *</span>
    72. 

  72. <a name="l00053"></a>00053 <span class="comment"> * For more information, see the GCC documentation:</span>
    73. 

  73. <a name="l00054"></a>00054 <span class="comment"> * http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html</span>
    74. 

  74. <a name="l00055"></a>00055 <span class="comment"> *</span>
    75. 

  75. <a name="l00056"></a>00056 <span class="comment"> */</span>
    76. 

  76. <a name="l00057"></a>00057 
    77. 

  77. <a name="l00058"></a>00058 <span class="preprocessor">#ifndef __LC_ADDRLABELS_H__</span>
    78. 

  78. <a name="l00059"></a>00059 <span class="preprocessor"></span><span class="preprocessor">#define __LC_ADDRLABELS_H__</span>
    79. 

  79. <a name="l00060"></a>00060 <span class="preprocessor"></span><span class="comment"></span>
    80. 

  80. <a name="l00061"></a>00061 <span class="comment">/** \hideinitializer */</span>
    81. 

  81. <a name="l00062"></a><a class="code" href="a00017.html#g2bdc4b7b4038454a79f1b2a94a6d2a98">00062</a> <span class="keyword">typedef</span> <span class="keywordtype">void</span> * <a class="code" href="a00017.html#gfad6704adb116cc16edb80f744e7239d">lc_t</a>;
    82. 

  82. <a name="l00063"></a>00063 
    83. 

  83. <a name="l00064"></a><a class="code" href="a00017.html#g2c1bb4fa6d7a6ff951a41c73fc721109">00064</a> <span class="preprocessor">#define LC_INIT(s) s = NULL</span>
    84. 

  84. <a name="l00065"></a>00065 <span class="preprocessor"></span>
    85. 

  85. <a name="l00066"></a><a class="code" href="a00017.html#g1ec8b8f4710dce1fa7fb87d3a31541ae">00066</a> <span class="preprocessor">#define LC_RESUME(s)                            \</span>
    86. 

  86. <a name="l00067"></a>00067 <span class="preprocessor">  do {                                          \</span>
    87. 

  87. <a name="l00068"></a>00068 <span class="preprocessor">    if(s != NULL) {                             \</span>
    88. 

  88. <a name="l00069"></a>00069 <span class="preprocessor">      goto *s;                                  \</span>
    89. 

  89. <a name="l00070"></a>00070 <span class="preprocessor">    }                                           \</span>
    90. 

  90. <a name="l00071"></a>00071 <span class="preprocessor">  } while(0)</span>
    91. 

  91. <a name="l00072"></a>00072 <span class="preprocessor"></span>
    92. 

  92. <a name="l00073"></a><a class="code" href="a00017.html#g6e1e879e172e2d8838e5f567dac8918c">00073</a> <span class="preprocessor">#define LC_CONCAT2(s1, s2) s1##s2</span>
    93. 

  93. <a name="l00074"></a><a class="code" href="a00017.html#g2b1f9b9fe8b6895b156f0af10538971c">00074</a> <span class="preprocessor"></span><span class="preprocessor">#define LC_CONCAT(s1, s2) LC_CONCAT2(s1, s2)</span>
    94. 

  94. <a name="l00075"></a>00075 <span class="preprocessor"></span>
    95. 

  95. <a name="l00076"></a><a class="code" href="a00017.html#gd8eec328a4868d767f0c00c8d1c6cfc1">00076</a> <span class="preprocessor">#define LC_SET(s)                               \</span>
    96. 

  96. <a name="l00077"></a>00077 <span class="preprocessor">  do {                                          \</span>
    97. 

  97. <a name="l00078"></a>00078 <span class="preprocessor">    LC_CONCAT(LC_LABEL, __LINE__):              \</span>
    98. 

  98. <a name="l00079"></a>00079 <span class="preprocessor">    (s) = &amp;&amp;LC_CONCAT(LC_LABEL, __LINE__);      \</span>
    99. 

  99. <a name="l00080"></a>00080 <span class="preprocessor">  } while(0)</span>
    100. 

  100. <a name="l00081"></a>00081 <span class="preprocessor"></span>
    101. 

  101. <a name="l00082"></a><a class="code" href="a00017.html#gca51ceb2f5d855dfde55bcedf8d3b92d">00082</a> <span class="preprocessor">#define LC_END(s)</span>
    102. 

  102. <a name="l00083"></a>00083 <span class="preprocessor"></span>
    103. 

  103. <a name="l00084"></a>00084 <span class="preprocessor">#endif </span><span class="comment">/* __LC_ADDRLABELS_H__ */</span>
    104. 

  104. <a name="l00085"></a>00085 <span class="comment">/** @} */</span>
    105. 

  105. </pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Oct 2 10:06:29 2006 for The Protothreads Library 1.4 by&nbsp;
    106. 

  106. <a href="http://www.doxygen.org/index.html">
    107. 

  107. <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
    108. 

  108. </body>
    109. 

  109. </html>
    110.