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  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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  2. <html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
    3. 

  3. <title>The Protothreads Library 1.4: Protothreads</title>
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  8. <div class="tabs">
    9. 

  9.   <ul>
    10. 

  10.     <li><a href="main.html"><span>Main&nbsp;Page</span></a></li>
    11. 

  11.     <li><a href="modules.html"><span>Modules</span></a></li>
    12. 

  12.     <li><a href="annotated.html"><span>Data&nbsp;Structures</span></a></li>
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  13.     <li><a href="files.html"><span>Files</span></a></li>
    14. 

  14.   </ul></div>
    15. 

  15. <h1>Protothreads</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
    16. 

  16. Protothreads are implemented in a single header file, <a class="el" href="a00013.html">pt.h</a>, which includes the local continuations header file, <a class="el" href="a00011.html">lc.h</a>. 
    17. 

  17. <p>
    18. 

  18. This file in turn includes the actual implementation of local continuations, which typically also is contained in a single header file. 
    19. 

  19. <p>
    20. 

  20. <table border="0" cellpadding="0" cellspacing="0">
    21. 

  21. <tr><td></td></tr>
    22. 

  22. <tr><td colspan="2"><br><h2>Files</h2></td></tr>
    23. 

  23. <tr><td class="memItemLeft" nowrap align="right" valign="top">file &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00013.html">pt.h</a></td></tr>
    24. 

  24. 

  25. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Protothreads implementation. <br></td></tr>
    26. 

  26. 

  27. <p>
    28. 

  28. <tr><td colspan="2"><br><h2>Modules</h2></td></tr>
    29. 

  29. <tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00016.html">Protothread semaphores</a></td></tr>
    30. 

  30. 

  31. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">This module implements counting semaphores on top of protothreads. <br></td></tr>
    32. 

  32. 

  33. <p>
    34. 

  34. <tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00017.html">Local continuations</a></td></tr>
    35. 

  35. 

  36. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Local continuations form the basis for implementing protothreads. <br></td></tr>
    37. 

  37. 

  38. <p>
    39. 

  39. <tr><td colspan="2"><br><h2>Data Structures</h2></td></tr>
    40. 

  40. <tr><td class="memItemLeft" nowrap align="right" valign="top">struct &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00005.html">pt</a></td></tr>
    41. 

  41. 

  42. <tr><td colspan="2"><br><h2>Initialization</h2></td></tr>
    43. 

  43. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#ge6bae7dc0225468c8a5ac269df549892">PT_INIT</a>(<a class="el" href="a00005.html">pt</a>)</td></tr>
    44. 

  44. 

  45. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Initialize a protothread.  <a href="#ge6bae7dc0225468c8a5ac269df549892"></a><br></td></tr>
    46. 

  46. <tr><td colspan="2"><br><h2>Declaration and definition</h2></td></tr>
    47. 

  47. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g3d4c8bd4aada659eb34f5d2ffd3e7901">PT_THREAD</a>(name_args)</td></tr>
    48. 

  48. 

  49. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Declaration of a protothread.  <a href="#g3d4c8bd4aada659eb34f5d2ffd3e7901"></a><br></td></tr>
    50. 

  50. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g2ffbb9e554e08a343ae2f9de4bedfdfc">PT_BEGIN</a>(<a class="el" href="a00005.html">pt</a>)</td></tr>
    51. 

  51. 

  52. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Declare the start of a protothread inside the C function implementing the protothread.  <a href="#g2ffbb9e554e08a343ae2f9de4bedfdfc"></a><br></td></tr>
    53. 

  53. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g7b04a0035bef29d905496c23bae066d2">PT_END</a>(<a class="el" href="a00005.html">pt</a>)</td></tr>
    54. 

  54. 

  55. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Declare the end of a protothread.  <a href="#g7b04a0035bef29d905496c23bae066d2"></a><br></td></tr>
    56. 

  56. <tr><td colspan="2"><br><h2>Blocked wait</h2></td></tr>
    57. 

  57. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g99e43010ec61327164466aa2d902de45">PT_WAIT_UNTIL</a>(<a class="el" href="a00005.html">pt</a>, condition)</td></tr>
    58. 

  58. 

  59. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Block and wait until condition is true.  <a href="#g99e43010ec61327164466aa2d902de45"></a><br></td></tr>
    60. 

  60. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#gad14bbbf092b90aa0a5a4f9169504a8d">PT_WAIT_WHILE</a>(<a class="el" href="a00005.html">pt</a>, cond)</td></tr>
    61. 

  61. 

  62. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Block and wait while condition is true.  <a href="#gad14bbbf092b90aa0a5a4f9169504a8d"></a><br></td></tr>
    63. 

  63. <tr><td colspan="2"><br><h2>Hierarchical protothreads</h2></td></tr>
    64. 

  64. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g2f8f70c30b9ee08a103fbd69a4365c4c">PT_WAIT_THREAD</a>(<a class="el" href="a00005.html">pt</a>, thread)</td></tr>
    65. 

  65. 

  66. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Block and wait until a child protothread completes.  <a href="#g2f8f70c30b9ee08a103fbd69a4365c4c"></a><br></td></tr>
    67. 

  67. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g9e97a0b4d5cc7764d8e19758f5da53ae">PT_SPAWN</a>(<a class="el" href="a00005.html">pt</a>, child, thread)</td></tr>
    68. 

  68. 

  69. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Spawn a child protothread and wait until it exits.  <a href="#g9e97a0b4d5cc7764d8e19758f5da53ae"></a><br></td></tr>
    70. 

  70. <tr><td colspan="2"><br><h2>Exiting and restarting</h2></td></tr>
    71. 

  71. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#gcd3ac045f0a4ae63412e3b3d8780e8ab">PT_RESTART</a>(<a class="el" href="a00005.html">pt</a>)</td></tr>
    72. 

  72. 

  73. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Restart the protothread.  <a href="#gcd3ac045f0a4ae63412e3b3d8780e8ab"></a><br></td></tr>
    74. 

  74. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g905451249dca72ce0385bf2a9ff178ee">PT_EXIT</a>(<a class="el" href="a00005.html">pt</a>)</td></tr>
    75. 

  75. 

  76. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Exit the protothread.  <a href="#g905451249dca72ce0385bf2a9ff178ee"></a><br></td></tr>
    77. 

  77. <tr><td colspan="2"><br><h2>Calling a protothread</h2></td></tr>
    78. 

  78. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#gfa82b860a64b67d25ab3abc21811896f">PT_SCHEDULE</a>(f)</td></tr>
    79. 

  79. 

  80. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Schedule a protothread.  <a href="#gfa82b860a64b67d25ab3abc21811896f"></a><br></td></tr>
    81. 

  81. <tr><td colspan="2"><br><h2>Yielding from a protothread</h2></td></tr>
    82. 

  82. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g155cba6121323726d02c00284428fed6">PT_YIELD</a>(<a class="el" href="a00005.html">pt</a>)</td></tr>
    83. 

  83. 

  84. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Yield from the current protothread.  <a href="#g155cba6121323726d02c00284428fed6"></a><br></td></tr>
    85. 

  85. <tr><td class="memItemLeft" nowrap align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#ge3c821e3a388615528efda9d23c7d115">PT_YIELD_UNTIL</a>(<a class="el" href="a00005.html">pt</a>, cond)</td></tr>
    86. 

  86. 

  87. <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Yield from the protothread until a condition occurs.  <a href="#ge3c821e3a388615528efda9d23c7d115"></a><br></td></tr>
    88. 

  88. <tr><td colspan="2"><br><h2>Defines</h2></td></tr>
    89. 

  89. <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g7b5319b5b65761a845fcd1500fde4cdc"></a><!-- doxytag: member="pt::PT_WAITING" ref="g7b5319b5b65761a845fcd1500fde4cdc" args="" -->
    90. 

  90. #define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g7b5319b5b65761a845fcd1500fde4cdc">PT_WAITING</a>&nbsp;&nbsp;&nbsp;0</td></tr>
    91. 

  91. 

  92. <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ge469332907e0617d72d5e2dd4297119d"></a><!-- doxytag: member="pt::PT_YIELDED" ref="ge469332907e0617d72d5e2dd4297119d" args="" -->
    93. 

  93. #define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#ge469332907e0617d72d5e2dd4297119d">PT_YIELDED</a>&nbsp;&nbsp;&nbsp;1</td></tr>
    94. 

  94. 

  95. <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gcfae9053e5c107a1aed6b228c917d2ea"></a><!-- doxytag: member="pt::PT_EXITED" ref="gcfae9053e5c107a1aed6b228c917d2ea" args="" -->
    96. 

  96. #define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#gcfae9053e5c107a1aed6b228c917d2ea">PT_EXITED</a>&nbsp;&nbsp;&nbsp;2</td></tr>
    97. 

  97. 

  98. <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g9ff1e8936a8a26bff54c05f8a989b93b"></a><!-- doxytag: member="pt::PT_ENDED" ref="g9ff1e8936a8a26bff54c05f8a989b93b" args="" -->
    99. 

  99. #define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00014.html#g9ff1e8936a8a26bff54c05f8a989b93b">PT_ENDED</a>&nbsp;&nbsp;&nbsp;3</td></tr>
    100. 

  100. 

  101. </table>
    102. 

  102. <hr><h2>Define Documentation</h2>
    103. 

  103. <a class="anchor" name="g2ffbb9e554e08a343ae2f9de4bedfdfc"></a><!-- doxytag: member="pt.h::PT_BEGIN" ref="g2ffbb9e554e08a343ae2f9de4bedfdfc" args="(pt)" --><p>
    104. 

  104. <table class="mdTable" cellpadding="2" cellspacing="0">
    105. 

  105.   <tr>
    106. 

  106.     <td class="mdRow">
    107. 

  107.       <table cellpadding="0" cellspacing="0" border="0">
    108. 

  108.         <tr>
    109. 

  109.           <td class="md" nowrap valign="top">#define PT_BEGIN          </td>
    110. 

  110.           <td class="md" valign="top">(&nbsp;</td>
    111. 

  111.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>&nbsp;</td>
    112. 

  112.           <td class="mdname1" valign="top" nowrap>          </td>
    113. 

  113.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    114. 

  114.           <td class="md" nowrap></td>
    115. 

  115.         </tr>
    116. 

  116.       </table>
    117. 

  117.     </td>
    118. 

  118.   </tr>
    119. 

  119. </table>
    120. 

  120. <table cellspacing="5" cellpadding="0" border="0">
    121. 

  121.   <tr>
    122. 

  122.     <td>
    123. 

  123.       &nbsp;
    124. 

  124.     </td>
    125. 

  125.     <td>
    126. 

  126. 

  127. <p>
    128. 

  128. Declare the start of a protothread inside the C function implementing the protothread. 
    129. 

  129. <p>
    130. 

  130. This macro is used to declare the starting point of a protothread. It should be placed at the start of the function in which the protothread runs. All C statements above the <a class="el" href="a00014.html#g2ffbb9e554e08a343ae2f9de4bedfdfc">PT_BEGIN()</a> invokation will be executed each time the protothread is scheduled.<p>
    131. 

  131. <dl compact><dt><b>Parameters:</b></dt><dd>
    132. 

  132.   <table border="0" cellspacing="2" cellpadding="0">
    133. 

  133.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    134. 

  134.   </table>
    135. 

  135. </dl>
    136. 

  136. 

  137. <p>
    138. 

  138. Definition at line <a class="el" href="a00022.html#l00115">115</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    139. 

  139.   </tr>
    140. 

  140. </table>
    141. 

  141. <a class="anchor" name="g7b04a0035bef29d905496c23bae066d2"></a><!-- doxytag: member="pt.h::PT_END" ref="g7b04a0035bef29d905496c23bae066d2" args="(pt)" --><p>
    142. 

  142. <table class="mdTable" cellpadding="2" cellspacing="0">
    143. 

  143.   <tr>
    144. 

  144.     <td class="mdRow">
    145. 

  145.       <table cellpadding="0" cellspacing="0" border="0">
    146. 

  146.         <tr>
    147. 

  147.           <td class="md" nowrap valign="top">#define PT_END          </td>
    148. 

  148.           <td class="md" valign="top">(&nbsp;</td>
    149. 

  149.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>&nbsp;</td>
    150. 

  150.           <td class="mdname1" valign="top" nowrap>          </td>
    151. 

  151.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    152. 

  152.           <td class="md" nowrap></td>
    153. 

  153.         </tr>
    154. 

  154.       </table>
    155. 

  155.     </td>
    156. 

  156.   </tr>
    157. 

  157. </table>
    158. 

  158. <table cellspacing="5" cellpadding="0" border="0">
    159. 

  159.   <tr>
    160. 

  160.     <td>
    161. 

  161.       &nbsp;
    162. 

  162.     </td>
    163. 

  163.     <td>
    164. 

  164. 

  165. <p>
    166. 

  166. Declare the end of a protothread. 
    167. 

  167. <p>
    168. 

  168. This macro is used for declaring that a protothread ends. It must always be used together with a matching <a class="el" href="a00014.html#g2ffbb9e554e08a343ae2f9de4bedfdfc">PT_BEGIN()</a> macro.<p>
    169. 

  169. <dl compact><dt><b>Parameters:</b></dt><dd>
    170. 

  170.   <table border="0" cellspacing="2" cellpadding="0">
    171. 

  171.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    172. 

  172.   </table>
    173. 

  173. </dl>
    174. 

  174. 

  175. <p>
    176. 

  176. Definition at line <a class="el" href="a00022.html#l00127">127</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    177. 

  177.   </tr>
    178. 

  178. </table>
    179. 

  179. <a class="anchor" name="g905451249dca72ce0385bf2a9ff178ee"></a><!-- doxytag: member="pt.h::PT_EXIT" ref="g905451249dca72ce0385bf2a9ff178ee" args="(pt)" --><p>
    180. 

  180. <table class="mdTable" cellpadding="2" cellspacing="0">
    181. 

  181.   <tr>
    182. 

  182.     <td class="mdRow">
    183. 

  183.       <table cellpadding="0" cellspacing="0" border="0">
    184. 

  184.         <tr>
    185. 

  185.           <td class="md" nowrap valign="top">#define PT_EXIT          </td>
    186. 

  186.           <td class="md" valign="top">(&nbsp;</td>
    187. 

  187.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>&nbsp;</td>
    188. 

  188.           <td class="mdname1" valign="top" nowrap>          </td>
    189. 

  189.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    190. 

  190.           <td class="md" nowrap></td>
    191. 

  191.         </tr>
    192. 

  192.       </table>
    193. 

  193.     </td>
    194. 

  194.   </tr>
    195. 

  195. </table>
    196. 

  196. <table cellspacing="5" cellpadding="0" border="0">
    197. 

  197.   <tr>
    198. 

  198.     <td>
    199. 

  199.       &nbsp;
    200. 

  200.     </td>
    201. 

  201.     <td>
    202. 

  202. 

  203. <p>
    204. 

  204. Exit the protothread. 
    205. 

  205. <p>
    206. 

  206. This macro causes the protothread to exit. If the protothread was spawned by another protothread, the parent protothread will become unblocked and can continue to run.<p>
    207. 

  207. <dl compact><dt><b>Parameters:</b></dt><dd>
    208. 

  208.   <table border="0" cellspacing="2" cellpadding="0">
    209. 

  209.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    210. 

  210.   </table>
    211. 

  211. </dl>
    212. 

  212. 

  213. <p>
    214. 

  214. Definition at line <a class="el" href="a00022.html#l00246">246</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    215. 

  215.   </tr>
    216. 

  216. </table>
    217. 

  217. <a class="anchor" name="ge6bae7dc0225468c8a5ac269df549892"></a><!-- doxytag: member="pt.h::PT_INIT" ref="ge6bae7dc0225468c8a5ac269df549892" args="(pt)" --><p>
    218. 

  218. <table class="mdTable" cellpadding="2" cellspacing="0">
    219. 

  219.   <tr>
    220. 

  220.     <td class="mdRow">
    221. 

  221.       <table cellpadding="0" cellspacing="0" border="0">
    222. 

  222.         <tr>
    223. 

  223.           <td class="md" nowrap valign="top">#define PT_INIT          </td>
    224. 

  224.           <td class="md" valign="top">(&nbsp;</td>
    225. 

  225.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>&nbsp;</td>
    226. 

  226.           <td class="mdname1" valign="top" nowrap>          </td>
    227. 

  227.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    228. 

  228.           <td class="md" nowrap></td>
    229. 

  229.         </tr>
    230. 

  230.       </table>
    231. 

  231.     </td>
    232. 

  232.   </tr>
    233. 

  233. </table>
    234. 

  234. <table cellspacing="5" cellpadding="0" border="0">
    235. 

  235.   <tr>
    236. 

  236.     <td>
    237. 

  237.       &nbsp;
    238. 

  238.     </td>
    239. 

  239.     <td>
    240. 

  240. 

  241. <p>
    242. 

  242. Initialize a protothread. 
    243. 

  243. <p>
    244. 

  244. Initializes a protothread. Initialization must be done prior to starting to execute the protothread.<p>
    245. 

  245. <dl compact><dt><b>Parameters:</b></dt><dd>
    246. 

  246.   <table border="0" cellspacing="2" cellpadding="0">
    247. 

  247.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure.</td></tr>
    248. 

  248.   </table>
    249. 

  249. </dl>
    250. 

  250. <dl compact><dt><b>See also:</b></dt><dd><a class="el" href="a00014.html#g9e97a0b4d5cc7764d8e19758f5da53ae">PT_SPAWN()</a> </dd></dl>
    251. 

  251. 

  252. <p>
    253. 

  253. Definition at line <a class="el" href="a00022.html#l00080">80</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    254. 

  254.   </tr>
    255. 

  255. </table>
    256. 

  256. <a class="anchor" name="gcd3ac045f0a4ae63412e3b3d8780e8ab"></a><!-- doxytag: member="pt.h::PT_RESTART" ref="gcd3ac045f0a4ae63412e3b3d8780e8ab" args="(pt)" --><p>
    257. 

  257. <table class="mdTable" cellpadding="2" cellspacing="0">
    258. 

  258.   <tr>
    259. 

  259.     <td class="mdRow">
    260. 

  260.       <table cellpadding="0" cellspacing="0" border="0">
    261. 

  261.         <tr>
    262. 

  262.           <td class="md" nowrap valign="top">#define PT_RESTART          </td>
    263. 

  263.           <td class="md" valign="top">(&nbsp;</td>
    264. 

  264.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>&nbsp;</td>
    265. 

  265.           <td class="mdname1" valign="top" nowrap>          </td>
    266. 

  266.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    267. 

  267.           <td class="md" nowrap></td>
    268. 

  268.         </tr>
    269. 

  269.       </table>
    270. 

  270.     </td>
    271. 

  271.   </tr>
    272. 

  272. </table>
    273. 

  273. <table cellspacing="5" cellpadding="0" border="0">
    274. 

  274.   <tr>
    275. 

  275.     <td>
    276. 

  276.       &nbsp;
    277. 

  277.     </td>
    278. 

  278.     <td>
    279. 

  279. 

  280. <p>
    281. 

  281. Restart the protothread. 
    282. 

  282. <p>
    283. 

  283. This macro will block and cause the running protothread to restart its execution at the place of the <a class="el" href="a00014.html#g2ffbb9e554e08a343ae2f9de4bedfdfc">PT_BEGIN()</a> call.<p>
    284. 

  284. <dl compact><dt><b>Parameters:</b></dt><dd>
    285. 

  285.   <table border="0" cellspacing="2" cellpadding="0">
    286. 

  286.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    287. 

  287.   </table>
    288. 

  288. </dl>
    289. 

  289. 

  290. <p>
    291. 

  291. Definition at line <a class="el" href="a00022.html#l00229">229</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    292. 

  292.   </tr>
    293. 

  293. </table>
    294. 

  294. <a class="anchor" name="gfa82b860a64b67d25ab3abc21811896f"></a><!-- doxytag: member="pt.h::PT_SCHEDULE" ref="gfa82b860a64b67d25ab3abc21811896f" args="(f)" --><p>
    295. 

  295. <table class="mdTable" cellpadding="2" cellspacing="0">
    296. 

  296.   <tr>
    297. 

  297.     <td class="mdRow">
    298. 

  298.       <table cellpadding="0" cellspacing="0" border="0">
    299. 

  299.         <tr>
    300. 

  300.           <td class="md" nowrap valign="top">#define PT_SCHEDULE          </td>
    301. 

  301.           <td class="md" valign="top">(&nbsp;</td>
    302. 

  302.           <td class="md" nowrap valign="top">f&nbsp;</td>
    303. 

  303.           <td class="mdname1" valign="top" nowrap>          </td>
    304. 

  304.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    305. 

  305.           <td class="md" nowrap></td>
    306. 

  306.         </tr>
    307. 

  307.       </table>
    308. 

  308.     </td>
    309. 

  309.   </tr>
    310. 

  310. </table>
    311. 

  311. <table cellspacing="5" cellpadding="0" border="0">
    312. 

  312.   <tr>
    313. 

  313.     <td>
    314. 

  314.       &nbsp;
    315. 

  315.     </td>
    316. 

  316.     <td>
    317. 

  317. 

  318. <p>
    319. 

  319. Schedule a protothread. 
    320. 

  320. <p>
    321. 

  321. This function shedules a protothread. The return value of the function is non-zero if the protothread is running or zero if the protothread has exited.<p>
    322. 

  322. <dl compact><dt><b>Parameters:</b></dt><dd>
    323. 

  323.   <table border="0" cellspacing="2" cellpadding="0">
    324. 

  324.     <tr><td valign="top"></td><td valign="top"><em>f</em>&nbsp;</td><td>The call to the C function implementing the protothread to be scheduled </td></tr>
    325. 

  325.   </table>
    326. 

  326. </dl>
    327. 

  327. 

  328. <p>
    329. 

  329. Definition at line <a class="el" href="a00022.html#l00271">271</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    330. 

  330.   </tr>
    331. 

  331. </table>
    332. 

  332. <a class="anchor" name="g9e97a0b4d5cc7764d8e19758f5da53ae"></a><!-- doxytag: member="pt.h::PT_SPAWN" ref="g9e97a0b4d5cc7764d8e19758f5da53ae" args="(pt, child, thread)" --><p>
    333. 

  333. <table class="mdTable" cellpadding="2" cellspacing="0">
    334. 

  334.   <tr>
    335. 

  335.     <td class="mdRow">
    336. 

  336.       <table cellpadding="0" cellspacing="0" border="0">
    337. 

  337.         <tr>
    338. 

  338.           <td class="md" nowrap valign="top">#define PT_SPAWN          </td>
    339. 

  339.           <td class="md" valign="top">(&nbsp;</td>
    340. 

  340.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>,         <tr>
    341. 

  341.           <td class="md" nowrap align="right"></td>
    342. 

  342.           <td class="md"></td>
    343. 

  343.           <td class="md" nowrap>child,         <tr>
    344. 

  344.           <td class="md" nowrap align="right"></td>
    345. 

  345.           <td class="md"></td>
    346. 

  346.           <td class="md" nowrap>thread&nbsp;</td>
    347. 

  347.           <td class="mdname1" valign="top" nowrap>          </td>
    348. 

  348.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    349. 

  349.           <td class="md" nowrap></td>
    350. 

  350.         </tr>
    351. 

  351.       </table>
    352. 

  352.     </td>
    353. 

  353.   </tr>
    354. 

  354. </table>
    355. 

  355. <table cellspacing="5" cellpadding="0" border="0">
    356. 

  356.   <tr>
    357. 

  357.     <td>
    358. 

  358.       &nbsp;
    359. 

  359.     </td>
    360. 

  360.     <td>
    361. 

  361. 

  362. <p>
    363. 

  363. Spawn a child protothread and wait until it exits. 
    364. 

  364. <p>
    365. 

  365. This macro spawns a child protothread and waits until it exits. The macro can only be used within a protothread.<p>
    366. 

  366. <dl compact><dt><b>Parameters:</b></dt><dd>
    367. 

  367.   <table border="0" cellspacing="2" cellpadding="0">
    368. 

  368.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    369. 

  369.     <tr><td valign="top"></td><td valign="top"><em>child</em>&nbsp;</td><td>A pointer to the child protothread's control structure. </td></tr>
    370. 

  370.     <tr><td valign="top"></td><td valign="top"><em>thread</em>&nbsp;</td><td>The child protothread with arguments </td></tr>
    371. 

  371.   </table>
    372. 

  372. </dl>
    373. 

  373. 

  374. <p>
    375. 

  375. Definition at line <a class="el" href="a00022.html#l00206">206</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    376. 

  376.   </tr>
    377. 

  377. </table>
    378. 

  378. <a class="anchor" name="g3d4c8bd4aada659eb34f5d2ffd3e7901"></a><!-- doxytag: member="pt.h::PT_THREAD" ref="g3d4c8bd4aada659eb34f5d2ffd3e7901" args="(name_args)" --><p>
    379. 

  379. <table class="mdTable" cellpadding="2" cellspacing="0">
    380. 

  380.   <tr>
    381. 

  381.     <td class="mdRow">
    382. 

  382.       <table cellpadding="0" cellspacing="0" border="0">
    383. 

  383.         <tr>
    384. 

  384.           <td class="md" nowrap valign="top">#define PT_THREAD          </td>
    385. 

  385.           <td class="md" valign="top">(&nbsp;</td>
    386. 

  386.           <td class="md" nowrap valign="top">name_args&nbsp;</td>
    387. 

  387.           <td class="mdname1" valign="top" nowrap>          </td>
    388. 

  388.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    389. 

  389.           <td class="md" nowrap></td>
    390. 

  390.         </tr>
    391. 

  391.       </table>
    392. 

  392.     </td>
    393. 

  393.   </tr>
    394. 

  394. </table>
    395. 

  395. <table cellspacing="5" cellpadding="0" border="0">
    396. 

  396.   <tr>
    397. 

  397.     <td>
    398. 

  398.       &nbsp;
    399. 

  399.     </td>
    400. 

  400.     <td>
    401. 

  401. 

  402. <p>
    403. 

  403. Declaration of a protothread. 
    404. 

  404. <p>
    405. 

  405. This macro is used to declare a protothread. All protothreads must be declared with this macro.<p>
    406. 

  406. <dl compact><dt><b>Parameters:</b></dt><dd>
    407. 

  407.   <table border="0" cellspacing="2" cellpadding="0">
    408. 

  408.     <tr><td valign="top"></td><td valign="top"><em>name_args</em>&nbsp;</td><td>The name and arguments of the C function implementing the protothread. </td></tr>
    409. 

  409.   </table>
    410. 

  410. </dl>
    411. 

  411. 

  412. <p>
    413. 

  413. Definition at line <a class="el" href="a00022.html#l00100">100</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    414. 

  414.   </tr>
    415. 

  415. </table>
    416. 

  416. <a class="anchor" name="g2f8f70c30b9ee08a103fbd69a4365c4c"></a><!-- doxytag: member="pt.h::PT_WAIT_THREAD" ref="g2f8f70c30b9ee08a103fbd69a4365c4c" args="(pt, thread)" --><p>
    417. 

  417. <table class="mdTable" cellpadding="2" cellspacing="0">
    418. 

  418.   <tr>
    419. 

  419.     <td class="mdRow">
    420. 

  420.       <table cellpadding="0" cellspacing="0" border="0">
    421. 

  421.         <tr>
    422. 

  422.           <td class="md" nowrap valign="top">#define PT_WAIT_THREAD          </td>
    423. 

  423.           <td class="md" valign="top">(&nbsp;</td>
    424. 

  424.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>,         <tr>
    425. 

  425.           <td class="md" nowrap align="right"></td>
    426. 

  426.           <td class="md"></td>
    427. 

  427.           <td class="md" nowrap>thread&nbsp;</td>
    428. 

  428.           <td class="mdname1" valign="top" nowrap>          </td>
    429. 

  429.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    430. 

  430.           <td class="md" nowrap></td>
    431. 

  431.         </tr>
    432. 

  432.       </table>
    433. 

  433.     </td>
    434. 

  434.   </tr>
    435. 

  435. </table>
    436. 

  436. <table cellspacing="5" cellpadding="0" border="0">
    437. 

  437.   <tr>
    438. 

  438.     <td>
    439. 

  439.       &nbsp;
    440. 

  440.     </td>
    441. 

  441.     <td>
    442. 

  442. 

  443. <p>
    444. 

  444. Block and wait until a child protothread completes. 
    445. 

  445. <p>
    446. 

  446. This macro schedules a child protothread. The current protothread will block until the child protothread completes.<p>
    447. 

  447. <dl compact><dt><b>Note:</b></dt><dd>The child protothread must be manually initialized with the <a class="el" href="a00014.html#ge6bae7dc0225468c8a5ac269df549892">PT_INIT()</a> function before this function is used.</dd></dl>
    448. 

  448. <dl compact><dt><b>Parameters:</b></dt><dd>
    449. 

  449.   <table border="0" cellspacing="2" cellpadding="0">
    450. 

  450.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    451. 

  451.     <tr><td valign="top"></td><td valign="top"><em>thread</em>&nbsp;</td><td>The child protothread with arguments</td></tr>
    452. 

  452.   </table>
    453. 

  453. </dl>
    454. 

  454. <dl compact><dt><b>See also:</b></dt><dd><a class="el" href="a00014.html#g9e97a0b4d5cc7764d8e19758f5da53ae">PT_SPAWN()</a> </dd></dl>
    455. 

  455. 

  456. <p>
    457. 

  457. Definition at line <a class="el" href="a00022.html#l00192">192</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    458. 

  458.   </tr>
    459. 

  459. </table>
    460. 

  460. <a class="anchor" name="g99e43010ec61327164466aa2d902de45"></a><!-- doxytag: member="pt.h::PT_WAIT_UNTIL" ref="g99e43010ec61327164466aa2d902de45" args="(pt, condition)" --><p>
    461. 

  461. <table class="mdTable" cellpadding="2" cellspacing="0">
    462. 

  462.   <tr>
    463. 

  463.     <td class="mdRow">
    464. 

  464.       <table cellpadding="0" cellspacing="0" border="0">
    465. 

  465.         <tr>
    466. 

  466.           <td class="md" nowrap valign="top">#define PT_WAIT_UNTIL          </td>
    467. 

  467.           <td class="md" valign="top">(&nbsp;</td>
    468. 

  468.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>,         <tr>
    469. 

  469.           <td class="md" nowrap align="right"></td>
    470. 

  470.           <td class="md"></td>
    471. 

  471.           <td class="md" nowrap>condition&nbsp;</td>
    472. 

  472.           <td class="mdname1" valign="top" nowrap>          </td>
    473. 

  473.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    474. 

  474.           <td class="md" nowrap></td>
    475. 

  475.         </tr>
    476. 

  476.       </table>
    477. 

  477.     </td>
    478. 

  478.   </tr>
    479. 

  479. </table>
    480. 

  480. <table cellspacing="5" cellpadding="0" border="0">
    481. 

  481.   <tr>
    482. 

  482.     <td>
    483. 

  483.       &nbsp;
    484. 

  484.     </td>
    485. 

  485.     <td>
    486. 

  486. 

  487. <p>
    488. 

  488. Block and wait until condition is true. 
    489. 

  489. <p>
    490. 

  490. This macro blocks the protothread until the specified condition is true.<p>
    491. 

  491. <dl compact><dt><b>Parameters:</b></dt><dd>
    492. 

  492.   <table border="0" cellspacing="2" cellpadding="0">
    493. 

  493.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    494. 

  494.     <tr><td valign="top"></td><td valign="top"><em>condition</em>&nbsp;</td><td>The condition. </td></tr>
    495. 

  495.   </table>
    496. 

  496. </dl>
    497. 

  497. 

  498. <p>
    499. 

  499. Definition at line <a class="el" href="a00022.html#l00148">148</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    500. 

  500.   </tr>
    501. 

  501. </table>
    502. 

  502. <a class="anchor" name="gad14bbbf092b90aa0a5a4f9169504a8d"></a><!-- doxytag: member="pt.h::PT_WAIT_WHILE" ref="gad14bbbf092b90aa0a5a4f9169504a8d" args="(pt, cond)" --><p>
    503. 

  503. <table class="mdTable" cellpadding="2" cellspacing="0">
    504. 

  504.   <tr>
    505. 

  505.     <td class="mdRow">
    506. 

  506.       <table cellpadding="0" cellspacing="0" border="0">
    507. 

  507.         <tr>
    508. 

  508.           <td class="md" nowrap valign="top">#define PT_WAIT_WHILE          </td>
    509. 

  509.           <td class="md" valign="top">(&nbsp;</td>
    510. 

  510.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>,         <tr>
    511. 

  511.           <td class="md" nowrap align="right"></td>
    512. 

  512.           <td class="md"></td>
    513. 

  513.           <td class="md" nowrap>cond&nbsp;</td>
    514. 

  514.           <td class="mdname1" valign="top" nowrap>          </td>
    515. 

  515.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    516. 

  516.           <td class="md" nowrap></td>
    517. 

  517.         </tr>
    518. 

  518.       </table>
    519. 

  519.     </td>
    520. 

  520.   </tr>
    521. 

  521. </table>
    522. 

  522. <table cellspacing="5" cellpadding="0" border="0">
    523. 

  523.   <tr>
    524. 

  524.     <td>
    525. 

  525.       &nbsp;
    526. 

  526.     </td>
    527. 

  527.     <td>
    528. 

  528. 

  529. <p>
    530. 

  530. Block and wait while condition is true. 
    531. 

  531. <p>
    532. 

  532. This function blocks and waits while condition is true. See <a class="el" href="a00014.html#g99e43010ec61327164466aa2d902de45">PT_WAIT_UNTIL()</a>.<p>
    533. 

  533. <dl compact><dt><b>Parameters:</b></dt><dd>
    534. 

  534.   <table border="0" cellspacing="2" cellpadding="0">
    535. 

  535.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    536. 

  536.     <tr><td valign="top"></td><td valign="top"><em>cond</em>&nbsp;</td><td>The condition. </td></tr>
    537. 

  537.   </table>
    538. 

  538. </dl>
    539. 

  539. 

  540. <p>
    541. 

  541. Definition at line <a class="el" href="a00022.html#l00167">167</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    542. 

  542.   </tr>
    543. 

  543. </table>
    544. 

  544. <a class="anchor" name="g155cba6121323726d02c00284428fed6"></a><!-- doxytag: member="pt.h::PT_YIELD" ref="g155cba6121323726d02c00284428fed6" args="(pt)" --><p>
    545. 

  545. <table class="mdTable" cellpadding="2" cellspacing="0">
    546. 

  546.   <tr>
    547. 

  547.     <td class="mdRow">
    548. 

  548.       <table cellpadding="0" cellspacing="0" border="0">
    549. 

  549.         <tr>
    550. 

  550.           <td class="md" nowrap valign="top">#define PT_YIELD          </td>
    551. 

  551.           <td class="md" valign="top">(&nbsp;</td>
    552. 

  552.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>&nbsp;</td>
    553. 

  553.           <td class="mdname1" valign="top" nowrap>          </td>
    554. 

  554.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    555. 

  555.           <td class="md" nowrap></td>
    556. 

  556.         </tr>
    557. 

  557.       </table>
    558. 

  558.     </td>
    559. 

  559.   </tr>
    560. 

  560. </table>
    561. 

  561. <table cellspacing="5" cellpadding="0" border="0">
    562. 

  562.   <tr>
    563. 

  563.     <td>
    564. 

  564.       &nbsp;
    565. 

  565.     </td>
    566. 

  566.     <td>
    567. 

  567. 

  568. <p>
    569. 

  569. Yield from the current protothread. 
    570. 

  570. <p>
    571. 

  571. This function will yield the protothread, thereby allowing other processing to take place in the system.<p>
    572. 

  572. <dl compact><dt><b>Parameters:</b></dt><dd>
    573. 

  573.   <table border="0" cellspacing="2" cellpadding="0">
    574. 

  574.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    575. 

  575.   </table>
    576. 

  576. </dl>
    577. 

  577. 

  578. <p>
    579. 

  579. Definition at line <a class="el" href="a00022.html#l00290">290</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    580. 

  580.   </tr>
    581. 

  581. </table>
    582. 

  582. <a class="anchor" name="ge3c821e3a388615528efda9d23c7d115"></a><!-- doxytag: member="pt.h::PT_YIELD_UNTIL" ref="ge3c821e3a388615528efda9d23c7d115" args="(pt, cond)" --><p>
    583. 

  583. <table class="mdTable" cellpadding="2" cellspacing="0">
    584. 

  584.   <tr>
    585. 

  585.     <td class="mdRow">
    586. 

  586.       <table cellpadding="0" cellspacing="0" border="0">
    587. 

  587.         <tr>
    588. 

  588.           <td class="md" nowrap valign="top">#define PT_YIELD_UNTIL          </td>
    589. 

  589.           <td class="md" valign="top">(&nbsp;</td>
    590. 

  590.           <td class="md" nowrap valign="top"><a class="el" href="a00005.html">pt</a>,         <tr>
    591. 

  591.           <td class="md" nowrap align="right"></td>
    592. 

  592.           <td class="md"></td>
    593. 

  593.           <td class="md" nowrap>cond&nbsp;</td>
    594. 

  594.           <td class="mdname1" valign="top" nowrap>          </td>
    595. 

  595.           <td class="md" valign="top">&nbsp;)&nbsp;</td>
    596. 

  596.           <td class="md" nowrap></td>
    597. 

  597.         </tr>
    598. 

  598.       </table>
    599. 

  599.     </td>
    600. 

  600.   </tr>
    601. 

  601. </table>
    602. 

  602. <table cellspacing="5" cellpadding="0" border="0">
    603. 

  603.   <tr>
    604. 

  604.     <td>
    605. 

  605.       &nbsp;
    606. 

  606.     </td>
    607. 

  607.     <td>
    608. 

  608. 

  609. <p>
    610. 

  610. Yield from the protothread until a condition occurs. 
    611. 

  611. <p>
    612. 

  612. <dl compact><dt><b>Parameters:</b></dt><dd>
    613. 

  613.   <table border="0" cellspacing="2" cellpadding="0">
    614. 

  614.     <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>A pointer to the protothread control structure. </td></tr>
    615. 

  615.     <tr><td valign="top"></td><td valign="top"><em>cond</em>&nbsp;</td><td>The condition.</td></tr>
    616. 

  616.   </table>
    617. 

  617. </dl>
    618. 

  618. This function will yield the protothread, until the specified condition evaluates to true. 
    619. 

  619. <p>
    620. 

  620. Definition at line <a class="el" href="a00022.html#l00310">310</a> of file <a class="el" href="a00022.html">pt.h</a>.    </td>
    621. 

  621.   </tr>
    622. 

  622. </table>
    623. 

  623. <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;
    624. 

  624. <a href="http://www.doxygen.org/index.html">
    625. 

  625. <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
    626. 

  626. </body>
    627. 

  627. </html>
    628.