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  52.   <div class="section" id="module-celery.worker">
    53. 

  53. <h1>Multiprocessing Worker - celery.worker<a class="headerlink" href="#module-celery.worker" title="Permalink to this headline">¶</a></h1>
    54. 

  54. <p>celery.worker</p>
    55. 

  55. <dl class="exception">
    56. 

  56. <dt id="celery.worker.EmptyQueue">
    57. 

  57. <em class="property">
    58. 

  58. exception </em><tt class="descclassname">celery.worker.</tt><tt class="descname">EmptyQueue</tt><a class="headerlink" href="#celery.worker.EmptyQueue" title="Permalink to this definition">¶</a></dt>
    59. 

  59. <dd>The message queue is currently empty.</dd></dl>
    60. 

  60. 

  61. <dl class="class">
    62. 

  62. <dt id="celery.worker.TaskDaemon">
    63. 

  63. <em class="property">
    64. 

  64. class </em><tt class="descclassname">celery.worker.</tt><tt class="descname">TaskDaemon</tt><big>(</big><em>concurrency=None</em>, <em>logfile=None</em>, <em>loglevel=None</em>, <em>queue_wakeup_after=None</em><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon" title="Permalink to this definition">¶</a></dt>
    65. 

  65. <dd><p>Executes tasks waiting in the task queue.</p>
    66. 

  66. <table class="docutils field-list" frame="void" rules="none">
    67. 

  67. <col class="field-name" />
    68. 

  68. <col class="field-body" />
    69. 

  69. <tbody valign="top">
    70. 

  70. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    71. 

  71. <li><em>concurrency</em> &#8211; see <a title="celery.worker.TaskDaemon.concurrency" class="reference internal" href="#celery.worker.TaskDaemon.concurrency"><tt class="xref docutils literal"><span class="pre">concurrency</span></tt></a>.</li>
    72. 

  72. <li><em>logfile</em> &#8211; see <a title="celery.worker.TaskDaemon.logfile" class="reference internal" href="#celery.worker.TaskDaemon.logfile"><tt class="xref docutils literal"><span class="pre">logfile</span></tt></a>.</li>
    73. 

  73. <li><em>loglevel</em> &#8211; see <a title="celery.worker.TaskDaemon.loglevel" class="reference internal" href="#celery.worker.TaskDaemon.loglevel"><tt class="xref docutils literal"><span class="pre">loglevel</span></tt></a>.</li>
    74. 

  74. <li><em>queue_wakeup_after</em> &#8211; see <a title="celery.worker.TaskDaemon.queue_wakeup_after" class="reference internal" href="#celery.worker.TaskDaemon.queue_wakeup_after"><tt class="xref docutils literal"><span class="pre">queue_wakeup_after</span></tt></a>.</li>
    75. 

  75. </ul>
    76. 

  76. </td>
    77. 

  77. </tr>
    78. 

  78. </tbody>
    79. 

  79. </table>
    80. 

  80. <dl class="attribute">
    81. 

  81. <dt id="celery.worker.TaskDaemon.concurrency">
    82. 

  82. <tt class="descname">concurrency</tt><a class="headerlink" href="#celery.worker.TaskDaemon.concurrency" title="Permalink to this definition">¶</a></dt>
    83. 

  83. <dd>The number of simultaneous processes doing work (default:
    84. 

  84. <a title="celery.conf.DAEMON_CONCURRENCY" class="reference external" href="celery.conf.html#celery.conf.DAEMON_CONCURRENCY"><tt class="xref docutils literal"><span class="pre">celery.conf.DAEMON_CONCURRENCY</span></tt></a>)</dd></dl>
    85. 

  85. 

  86. <dl class="attribute">
    87. 

  87. <dt id="celery.worker.TaskDaemon.loglevel">
    88. 

  88. <tt class="descname">loglevel</tt><a class="headerlink" href="#celery.worker.TaskDaemon.loglevel" title="Permalink to this definition">¶</a></dt>
    89. 

  89. <dd>The loglevel used (default: <tt class="xref docutils literal"><span class="pre">logging.INFO</span></tt>)</dd></dl>
    90. 

  90. 

  91. <dl class="attribute">
    92. 

  92. <dt id="celery.worker.TaskDaemon.logfile">
    93. 

  93. <tt class="descname">logfile</tt><a class="headerlink" href="#celery.worker.TaskDaemon.logfile" title="Permalink to this definition">¶</a></dt>
    94. 

  94. <dd>The logfile used, if no logfile is specified it uses <tt class="docutils literal"><span class="pre">stderr</span></tt>
    95. 

  95. (default: <a title="celery.conf.DAEMON_LOG_FILE" class="reference external" href="celery.conf.html#celery.conf.DAEMON_LOG_FILE"><tt class="xref docutils literal"><span class="pre">celery.conf.DAEMON_LOG_FILE</span></tt></a>).</dd></dl>
    96. 

  96. 

  97. <dl class="attribute">
    98. 

  98. <dt id="celery.worker.TaskDaemon.queue_wakeup_after">
    99. 

  99. <tt class="descname">queue_wakeup_after</tt><a class="headerlink" href="#celery.worker.TaskDaemon.queue_wakeup_after" title="Permalink to this definition">¶</a></dt>
    100. 

  100. <dd>The time it takes for the daemon to wake up after the queue is empty,
    101. 

  101. so it can check for more work
    102. 

  102. (default: <a title="celery.conf.QUEUE_WAKEUP_AFTER" class="reference external" href="celery.conf.html#celery.conf.QUEUE_WAKEUP_AFTER"><tt class="xref docutils literal"><span class="pre">celery.conf.QUEUE_WAKEUP_AFTER</span></tt></a>).</dd></dl>
    103. 

  103. 

  104. <dl class="attribute">
    105. 

  105. <dt id="celery.worker.TaskDaemon.empty_msg_emit_every">
    106. 

  106. <tt class="descname">empty_msg_emit_every</tt><a class="headerlink" href="#celery.worker.TaskDaemon.empty_msg_emit_every" title="Permalink to this definition">¶</a></dt>
    107. 

  107. <dd>How often the daemon emits the <tt class="docutils literal"><span class="pre">&quot;Waiting</span> <span class="pre">for</span> <span class="pre">queue...&quot;</span></tt> message.
    108. 

  108. If this is <tt class="xref docutils literal"><span class="pre">None</span></tt>, the message will never be logged.
    109. 

  109. (default: <a title="celery.conf.EMPTY_MSG_EMIT_EVERY" class="reference external" href="celery.conf.html#celery.conf.EMPTY_MSG_EMIT_EVERY"><tt class="xref docutils literal"><span class="pre">celery.conf.EMPTY_MSG_EMIT_EVERY</span></tt></a>)</dd></dl>
    110. 

  110. 

  111. <dl class="attribute">
    112. 

  112. <dt id="celery.worker.TaskDaemon.logger">
    113. 

  113. <tt class="descname">logger</tt><a class="headerlink" href="#celery.worker.TaskDaemon.logger" title="Permalink to this definition">¶</a></dt>
    114. 

  114. <dd>The <tt class="xref docutils literal"><span class="pre">logging.Logger</span></tt> instance used for logging.</dd></dl>
    115. 

  115. 

  116. <dl class="attribute">
    117. 

  117. <dt id="celery.worker.TaskDaemon.pool">
    118. 

  118. <tt class="descname">pool</tt><a class="headerlink" href="#celery.worker.TaskDaemon.pool" title="Permalink to this definition">¶</a></dt>
    119. 

  119. <dd>The <tt class="xref docutils literal"><span class="pre">multiprocessing.Pool</span></tt> instance used.</dd></dl>
    120. 

  120. 

  121. <dl class="attribute">
    122. 

  122. <dt id="celery.worker.TaskDaemon.task_consumer">
    123. 

  123. <tt class="descname">task_consumer</tt><a class="headerlink" href="#celery.worker.TaskDaemon.task_consumer" title="Permalink to this definition">¶</a></dt>
    124. 

  124. <dd>The <a title="celery.messaging.TaskConsumer" class="reference external" href="celery.messaging.html#celery.messaging.TaskConsumer"><tt class="xref docutils literal"><span class="pre">celery.messaging.TaskConsumer</span></tt></a> instance used.</dd></dl>
    125. 

  125. 

  126. <dl class="method">
    127. 

  127. <dt id="celery.worker.TaskDaemon.connection_diagnostics">
    128. 

  128. <tt class="descname">connection_diagnostics</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.connection_diagnostics" title="Permalink to this definition">¶</a></dt>
    129. 

  129. <dd>Diagnose the AMQP connection, and reset connection if
    130. 

  130. necessary.</dd></dl>
    131. 

  131. 

  132. <dl class="method">
    133. 

  133. <dt id="celery.worker.TaskDaemon.execute_next_task">
    134. 

  134. <tt class="descname">execute_next_task</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.execute_next_task" title="Permalink to this definition">¶</a></dt>
    135. 

  135. <dd><p>Execute the next task on the queue using the multiprocessing pool.</p>
    136. 

  136. <p>Catches all exceptions and logs them with level
    137. 

  137. <tt class="xref docutils literal"><span class="pre">logging.CRITICAL</span></tt>.</p>
    138. 

  138. </dd></dl>
    139. 

  139. 

  140. <dl class="method">
    141. 

  141. <dt id="celery.worker.TaskDaemon.fetch_next_task">
    142. 

  142. <tt class="descname">fetch_next_task</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.fetch_next_task" title="Permalink to this definition">¶</a></dt>
    143. 

  143. <dd><p>Fetch the next task from the AMQP broker.</p>
    144. 

  144. <p>Raises <a title="celery.worker.EmptyQueue" class="reference internal" href="#celery.worker.EmptyQueue"><tt class="xref docutils literal"><span class="pre">EmptyQueue</span></tt></a> exception if there is no message
    145. 

  145. waiting on the queue.</p>
    146. 

  146. <table class="docutils field-list" frame="void" rules="none">
    147. 

  147. <col class="field-name" />
    148. 

  148. <col class="field-body" />
    149. 

  149. <tbody valign="top">
    150. 

  150. <tr class="field"><th class="field-name">Returns:</th><td class="field-body"><a title="celery.worker.TaskWrapper" class="reference internal" href="#celery.worker.TaskWrapper"><tt class="xref docutils literal"><span class="pre">TaskWrapper</span></tt></a> instance.</td>
    151. 

  151. </tr>
    152. 

  152. </tbody>
    153. 

  153. </table>
    154. 

  154. </dd></dl>
    155. 

  155. 

  156. <dl class="method">
    157. 

  157. <dt id="celery.worker.TaskDaemon.receive_message">
    158. 

  158. <tt class="descname">receive_message</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.receive_message" title="Permalink to this definition">¶</a></dt>
    159. 

  159. <dd><p>Receive the next message from the message broker.</p>
    160. 

  160. <p>Tries to reset the AMQP connection if not available.
    161. 

  161. Returns <tt class="xref docutils literal"><span class="pre">None</span></tt> if no message is waiting on the queue.</p>
    162. 

  162. <table class="docutils field-list" frame="void" rules="none">
    163. 

  163. <col class="field-name" />
    164. 

  164. <col class="field-body" />
    165. 

  165. <tbody valign="top">
    166. 

  166. <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><tt class="xref docutils literal"><span class="pre">carrot.messaging.Message</span></tt> instance.</td>
    167. 

  167. </tr>
    168. 

  168. </tbody>
    169. 

  169. </table>
    170. 

  170. </dd></dl>
    171. 

  171. 

  172. <dl class="method">
    173. 

  173. <dt id="celery.worker.TaskDaemon.reset_connection">
    174. 

  174. <tt class="descname">reset_connection</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.reset_connection" title="Permalink to this definition">¶</a></dt>
    175. 

  175. <dd><p>Reset the AMQP connection, and reinitialize the
    176. 

  176. <a title="celery.messaging.TaskConsumer" class="reference external" href="celery.messaging.html#celery.messaging.TaskConsumer"><tt class="xref docutils literal"><span class="pre">celery.messaging.TaskConsumer</span></tt></a> instance.</p>
    177. 

  177. <p>Resets the task consumer in <a title="celery.worker.TaskDaemon.task_consumer" class="reference internal" href="#celery.worker.TaskDaemon.task_consumer"><tt class="xref docutils literal"><span class="pre">task_consumer</span></tt></a>.</p>
    178. 

  178. </dd></dl>
    179. 

  179. 

  180. <dl class="method">
    181. 

  181. <dt id="celery.worker.TaskDaemon.run">
    182. 

  182. <tt class="descname">run</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.run" title="Permalink to this definition">¶</a></dt>
    183. 

  183. <dd>Starts the workers main loop.</dd></dl>
    184. 

  184. 

  185. <dl class="method">
    186. 

  186. <dt id="celery.worker.TaskDaemon.run_periodic_tasks">
    187. 

  187. <tt class="descname">run_periodic_tasks</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.run_periodic_tasks" title="Permalink to this definition">¶</a></dt>
    188. 

  188. <dd><p>Schedule all waiting periodic tasks for execution.</p>
    189. 

  189. <table class="docutils field-list" frame="void" rules="none">
    190. 

  190. <col class="field-name" />
    191. 

  191. <col class="field-body" />
    192. 

  192. <tbody valign="top">
    193. 

  193. <tr class="field"><th class="field-name">Return type:</th><td class="field-body">list of <tt class="xref docutils literal"><span class="pre">celery.models.PeriodicTaskMeta</span></tt> objects.</td>
    194. 

  194. </tr>
    195. 

  195. </tbody>
    196. 

  196. </table>
    197. 

  197. </dd></dl>
    198. 

  198. 

  199. <dl class="method">
    200. 

  200. <dt id="celery.worker.TaskDaemon.schedule_retry_tasks">
    201. 

  201. <tt class="descname">schedule_retry_tasks</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.schedule_retry_tasks" title="Permalink to this definition">¶</a></dt>
    202. 

  202. <dd>Reschedule all requeued tasks waiting for retry.</dd></dl>
    203. 

  203. 

  204. </dd></dl>
    205. 

  205. 

  206. <dl class="class">
    207. 

  207. <dt id="celery.worker.TaskWrapper">
    208. 

  208. <em class="property">
    209. 

  209. class </em><tt class="descclassname">celery.worker.</tt><tt class="descname">TaskWrapper</tt><big>(</big><em>task_name</em>, <em>task_id</em>, <em>task_func</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper" title="Permalink to this definition">¶</a></dt>
    210. 

  210. <dd><p>Class wrapping a task to be run.</p>
    211. 

  211. <table class="docutils field-list" frame="void" rules="none">
    212. 

  212. <col class="field-name" />
    213. 

  213. <col class="field-body" />
    214. 

  214. <tbody valign="top">
    215. 

  215. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    216. 

  216. <li><em>task_name</em> &#8211; see <a title="celery.worker.TaskWrapper.task_name" class="reference internal" href="#celery.worker.TaskWrapper.task_name"><tt class="xref docutils literal"><span class="pre">task_name</span></tt></a>.</li>
    217. 

  217. <li><em>task_id</em> &#8211; see <a title="celery.worker.TaskWrapper.task_id" class="reference internal" href="#celery.worker.TaskWrapper.task_id"><tt class="xref docutils literal"><span class="pre">task_id</span></tt></a>.</li>
    218. 

  218. <li><em>task_func</em> &#8211; see <a title="celery.worker.TaskWrapper.task_func" class="reference internal" href="#celery.worker.TaskWrapper.task_func"><tt class="xref docutils literal"><span class="pre">task_func</span></tt></a></li>
    219. 

  219. <li><em>args</em> &#8211; see <a title="celery.worker.TaskWrapper.args" class="reference internal" href="#celery.worker.TaskWrapper.args"><tt class="xref docutils literal"><span class="pre">args</span></tt></a></li>
    220. 

  220. <li><em>kwargs</em> &#8211; see <a title="celery.worker.TaskWrapper.kwargs" class="reference internal" href="#celery.worker.TaskWrapper.kwargs"><tt class="xref docutils literal"><span class="pre">kwargs</span></tt></a>.</li>
    221. 

  221. </ul>
    222. 

  222. </td>
    223. 

  223. </tr>
    224. 

  224. </tbody>
    225. 

  225. </table>
    226. 

  226. <dl class="attribute">
    227. 

  227. <dt id="celery.worker.TaskWrapper.task_name">
    228. 

  228. <tt class="descname">task_name</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_name" title="Permalink to this definition">¶</a></dt>
    229. 

  229. <dd>Kind of task. Must be a name registered in the task registry.</dd></dl>
    230. 

  230. 

  231. <dl class="attribute">
    232. 

  232. <dt id="celery.worker.TaskWrapper.task_id">
    233. 

  233. <tt class="descname">task_id</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_id" title="Permalink to this definition">¶</a></dt>
    234. 

  234. <dd>UUID of the task.</dd></dl>
    235. 

  235. 

  236. <dl class="attribute">
    237. 

  237. <dt id="celery.worker.TaskWrapper.task_func">
    238. 

  238. <tt class="descname">task_func</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_func" title="Permalink to this definition">¶</a></dt>
    239. 

  239. <dd>The tasks callable object.</dd></dl>
    240. 

  240. 

  241. <dl class="attribute">
    242. 

  242. <dt id="celery.worker.TaskWrapper.args">
    243. 

  243. <tt class="descname">args</tt><a class="headerlink" href="#celery.worker.TaskWrapper.args" title="Permalink to this definition">¶</a></dt>
    244. 

  244. <dd>List of positional arguments to apply to the task.</dd></dl>
    245. 

  245. 

  246. <dl class="attribute">
    247. 

  247. <dt id="celery.worker.TaskWrapper.kwargs">
    248. 

  248. <tt class="descname">kwargs</tt><a class="headerlink" href="#celery.worker.TaskWrapper.kwargs" title="Permalink to this definition">¶</a></dt>
    249. 

  249. <dd>Mapping of keyword arguments to apply to the task.</dd></dl>
    250. 

  250. 

  251. <dl class="method">
    252. 

  252. <dt id="celery.worker.TaskWrapper.execute">
    253. 

  253. <tt class="descname">execute</tt><big>(</big><em>loglevel=None</em>, <em>logfile=None</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.execute" title="Permalink to this definition">¶</a></dt>
    254. 

  254. <dd><p>Execute the task in a <a title="celery.worker.jail" class="reference internal" href="#celery.worker.jail"><tt class="xref docutils literal"><span class="pre">jail()</span></tt></a> and store return value
    255. 

  255. and status in the task meta backend.</p>
    256. 

  256. <table class="docutils field-list" frame="void" rules="none">
    257. 

  257. <col class="field-name" />
    258. 

  258. <col class="field-body" />
    259. 

  259. <tbody valign="top">
    260. 

  260. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    261. 

  261. <li><em>loglevel</em> &#8211; The loglevel used by the task.</li>
    262. 

  262. <li><em>logfile</em> &#8211; The logfile used by the task.</li>
    263. 

  263. </ul>
    264. 

  264. </td>
    265. 

  265. </tr>
    266. 

  266. </tbody>
    267. 

  267. </table>
    268. 

  268. </dd></dl>
    269. 

  269. 

  270. <dl class="method">
    271. 

  271. <dt id="celery.worker.TaskWrapper.execute_using_pool">
    272. 

  272. <tt class="descname">execute_using_pool</tt><big>(</big><em>pool</em>, <em>loglevel=None</em>, <em>logfile=None</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.execute_using_pool" title="Permalink to this definition">¶</a></dt>
    273. 

  273. <dd><p>Like <a title="celery.worker.TaskWrapper.execute" class="reference internal" href="#celery.worker.TaskWrapper.execute"><tt class="xref docutils literal"><span class="pre">execute()</span></tt></a>, but using the <tt class="xref docutils literal"><span class="pre">multiprocessing</span></tt> pool.</p>
    274. 

  274. <table class="docutils field-list" frame="void" rules="none">
    275. 

  275. <col class="field-name" />
    276. 

  276. <col class="field-body" />
    277. 

  277. <tbody valign="top">
    278. 

  278. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    279. 

  279. <li><em>pool</em> &#8211; A <tt class="xref docutils literal"><span class="pre">multiprocessing.Pool</span></tt> instance.</li>
    280. 

  280. <li><em>loglevel</em> &#8211; The loglevel used by the task.</li>
    281. 

  281. <li><em>logfile</em> &#8211; The logfile used by the task.</li>
    282. 

  282. </ul>
    283. 

  283. </td>
    284. 

  284. </tr>
    285. 

  285. </tbody>
    286. 

  286. </table>
    287. 

  287. <p>:returns <tt class="xref docutils literal"><span class="pre">multiprocessing.AsyncResult</span></tt> instance.</p>
    288. 

  288. </dd></dl>
    289. 

  289. 

  290. <dl class="method">
    291. 

  291. <dt id="celery.worker.TaskWrapper.extend_with_default_kwargs">
    292. 

  292. <tt class="descname">extend_with_default_kwargs</tt><big>(</big><em>loglevel</em>, <em>logfile</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.extend_with_default_kwargs" title="Permalink to this definition">¶</a></dt>
    293. 

  293. <dd><p>Extend the tasks keyword arguments with standard task arguments.</p>
    294. 

  294. <p>These are <tt class="docutils literal"><span class="pre">logfile</span></tt>, <tt class="docutils literal"><span class="pre">loglevel</span></tt>, <tt class="docutils literal"><span class="pre">task_id</span></tt> and <tt class="docutils literal"><span class="pre">task_name</span></tt>.</p>
    295. 

  295. </dd></dl>
    296. 

  296. 

  297. <dl class="classmethod">
    298. 

  298. <dt id="celery.worker.TaskWrapper.from_message">
    299. 

  299. <em class="property">
    300. 

  300. classmethod </em><tt class="descname">from_message</tt><big>(</big><em>message</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.from_message" title="Permalink to this definition">¶</a></dt>
    301. 

  301. <dd><p>Create a <a title="celery.worker.TaskWrapper" class="reference internal" href="#celery.worker.TaskWrapper"><tt class="xref docutils literal"><span class="pre">TaskWrapper</span></tt></a> from a task message sent by
    302. 

  302. <a title="celery.messaging.TaskPublisher" class="reference external" href="celery.messaging.html#celery.messaging.TaskPublisher"><tt class="xref docutils literal"><span class="pre">celery.messaging.TaskPublisher</span></tt></a>.</p>
    303. 

  303. <table class="docutils field-list" frame="void" rules="none">
    304. 

  304. <col class="field-name" />
    305. 

  305. <col class="field-body" />
    306. 

  306. <tbody valign="top">
    307. 

  307. <tr class="field"><th class="field-name" colspan="2">Raises <a title="celery.worker.UnknownTask" class="reference internal" href="#celery.worker.UnknownTask">UnknownTask</a>:</th></tr>
    308. 

  308. <tr><td>&nbsp;</td><td class="field-body">if the message does not describe a task,
    309. 

  309. the message is also rejected.</td>
    310. 

  310. </tr>
    311. 

  311. <tr class="field"><th class="field-name">Returns:</th><td class="field-body"><a title="celery.worker.TaskWrapper" class="reference internal" href="#celery.worker.TaskWrapper"><tt class="xref docutils literal"><span class="pre">TaskWrapper</span></tt></a> instance.</td>
    312. 

  312. </tr>
    313. 

  313. </tbody>
    314. 

  314. </table>
    315. 

  315. </dd></dl>
    316. 

  316. 

  317. </dd></dl>
    318. 

  318. 

  319. <dl class="exception">
    320. 

  320. <dt id="celery.worker.UnknownTask">
    321. 

  321. <em class="property">
    322. 

  322. exception </em><tt class="descclassname">celery.worker.</tt><tt class="descname">UnknownTask</tt><a class="headerlink" href="#celery.worker.UnknownTask" title="Permalink to this definition">¶</a></dt>
    323. 

  323. <dd>Got an unknown task in the queue. The message is requeued and
    324. 

  324. ignored.</dd></dl>
    325. 

  325. 

  326. <dl class="function">
    327. 

  327. <dt id="celery.worker.jail">
    328. 

  328. <tt class="descclassname">celery.worker.</tt><tt class="descname">jail</tt><big>(</big><em>task_id</em>, <em>func</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#celery.worker.jail" title="Permalink to this definition">¶</a></dt>
    329. 

  329. <dd><p>Wraps the task in a jail, which catches all exceptions, and 
    330. 

  330. saves the status and result of the task execution to the task
    331. 

  331. meta backend.</p>
    332. 

  332. <p>If the call was successful, it saves the result to the task result
    333. 

  333. backend, and sets the task status to <tt class="docutils literal"><span class="pre">&quot;DONE&quot;</span></tt>.</p>
    334. 

  334. <p>If the call results in an exception, it saves the exception as the task
    335. 

  335. result, and sets the task status to <tt class="docutils literal"><span class="pre">&quot;FAILURE&quot;</span></tt>.</p>
    336. 

  336. <table class="docutils field-list" frame="void" rules="none">
    337. 

  337. <col class="field-name" />
    338. 

  338. <col class="field-body" />
    339. 

  339. <tbody valign="top">
    340. 

  340. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    341. 

  341. <li><em>task_id</em> &#8211; The id of the task.</li>
    342. 

  342. <li><em>func</em> &#8211; Callable object to execute.</li>
    343. 

  343. <li><em>args</em> &#8211; List of positional args to pass on to the function.</li>
    344. 

  344. <li><em>kwargs</em> &#8211; Keyword arguments mapping to pass on to the function.</li>
    345. 

  345. </ul>
    346. 

  346. </td>
    347. 

  347. </tr>
    348. 

  348. <tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the function return value on success.</p>
    349. 

  349. </td>
    350. 

  350. </tr>
    351. 

  351. <tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the exception instance on failure.</p>
    352. 

  352. </td>
    353. 

  353. </tr>
    354. 

  354. </tbody>
    355. 

  355. </table>
    356. 

  356. </dd></dl>
    357. 

  357. 

  358. </div>
    359. 

  359. 

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    363. 

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    364. 

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  366. 	  <h3>Contents</h3>
    367. 

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    368. 

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    369. 

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    370. 

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    371. 

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    372. 

  372. <li class="toctree-l2"><a class="reference external" href="celery.registry.html">Task Registry - celery.registry</a></li>
    373. 

  373. <li class="toctree-l2"><a class="reference external" href="celery.discovery.html">Task Discovery - celery.discovery</a></li>
    374. 

  374. <li class="toctree-l2 current"><a class="current reference external" href="">Multiprocessing Worker - celery.worker</a></li>
    375. 

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    380. 

  380. <li class="toctree-l2"><a class="reference external" href="celery.conf.html">Configuration - celery.conf</a></li>
    381. 

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    384. 

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    385. 

  385. <li class="toctree-l2"><a class="reference external" href="celery.messaging.html">Messaging - celery.messaging</a></li>
    386. 

  386. <li class="toctree-l2"><a class="reference external" href="celery.platform.html">Platform Specific - celery.platform</a></li>
    387. 

  387. <li class="toctree-l2"><a class="reference external" href="celery.timer.html">Timers - celery.timer</a></li>
    388. 

  388. <li class="toctree-l2"><a class="reference external" href="celery.bin.celeryd.html">Celery Worker Daemon - celery.bin.celeryd</a></li>
    389. 

  389. </ul>
    390. 

  390. </li>
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