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    53. 

  53.   <div class="section" id="module-celery.worker">
    54. 

  54. <h1>Multiprocessing Worker - celery.worker<a class="headerlink" href="#module-celery.worker" title="Permalink to this headline">¶</a></h1>
    55. 

  55. <p>celery.worker</p>
    56. 

  56. <dl class="class">
    57. 

  57. <dt id="celery.worker.PeriodicWorkController">
    58. 

  58. <em class="property">
    59. 

  59. class </em><tt class="descclassname">celery.worker.</tt><tt class="descname">PeriodicWorkController</tt><a class="headerlink" href="#celery.worker.PeriodicWorkController" title="Permalink to this definition">¶</a></dt>
    60. 

  60. <dd><p>A thread that continuously checks if there are
    61. 

  61. <a title="celery.task.PeriodicTask" class="reference external" href="celery.task.html#celery.task.PeriodicTask"><tt class="xref docutils literal"><span class="pre">celery.task.PeriodicTask</span></tt></a> tasks waiting for execution,
    62. 

  62. and executes them.</p>
    63. 

  63. <p>Example:</p>
    64. 

  64. <div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">PeriodicWorkController</span><span class="p">()</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
    65. 

  65. </pre></div>
    66. 

  66. </div>
    67. 

  67. <dl class="method">
    68. 

  68. <dt id="celery.worker.PeriodicWorkController.run">
    69. 

  69. <tt class="descname">run</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.PeriodicWorkController.run" title="Permalink to this definition">¶</a></dt>
    70. 

  70. <dd>Run when you use <tt class="xref docutils literal"><span class="pre">Thread.start()</span></tt></dd></dl>
    71. 

  71. 

  72. <dl class="method">
    73. 

  73. <dt id="celery.worker.PeriodicWorkController.stop">
    74. 

  74. <tt class="descname">stop</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.PeriodicWorkController.stop" title="Permalink to this definition">¶</a></dt>
    75. 

  75. <dd>Shutdown the thread.</dd></dl>
    76. 

  76. 

  77. </dd></dl>
    78. 

  78. 

  79. <dl class="class">
    80. 

  80. <dt id="celery.worker.TaskWrapper">
    81. 

  81. <em class="property">
    82. 

  82. 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>, <em>on_acknowledge=None</em>, <em>**opts</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper" title="Permalink to this definition">¶</a></dt>
    83. 

  83. <dd><p>Class wrapping a task to be run.</p>
    84. 

  84. <table class="docutils field-list" frame="void" rules="none">
    85. 

  85. <col class="field-name" />
    86. 

  86. <col class="field-body" />
    87. 

  87. <tbody valign="top">
    88. 

  88. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    89. 

  89. <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>
    90. 

  90. <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>
    91. 

  91. <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>
    92. 

  92. <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>
    93. 

  93. <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>
    94. 

  94. </ul>
    95. 

  95. </td>
    96. 

  96. </tr>
    97. 

  97. </tbody>
    98. 

  98. </table>
    99. 

  99. <dl class="attribute">
    100. 

  100. <dt id="celery.worker.TaskWrapper.task_name">
    101. 

  101. <tt class="descname">task_name</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_name" title="Permalink to this definition">¶</a></dt>
    102. 

  102. <dd>Kind of task. Must be a name registered in the task registry.</dd></dl>
    103. 

  103. 

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

  105. <dt id="celery.worker.TaskWrapper.task_id">
    106. 

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

  107. <dd>UUID of the task.</dd></dl>
    108. 

  108. 

  109. <dl class="attribute">
    110. 

  110. <dt id="celery.worker.TaskWrapper.task_func">
    111. 

  111. <tt class="descname">task_func</tt><a class="headerlink" href="#celery.worker.TaskWrapper.task_func" title="Permalink to this definition">¶</a></dt>
    112. 

  112. <dd>The tasks callable object.</dd></dl>
    113. 

  113. 

  114. <dl class="attribute">
    115. 

  115. <dt id="celery.worker.TaskWrapper.args">
    116. 

  116. <tt class="descname">args</tt><a class="headerlink" href="#celery.worker.TaskWrapper.args" title="Permalink to this definition">¶</a></dt>
    117. 

  117. <dd>List of positional arguments to apply to the task.</dd></dl>
    118. 

  118. 

  119. <dl class="attribute">
    120. 

  120. <dt id="celery.worker.TaskWrapper.kwargs">
    121. 

  121. <tt class="descname">kwargs</tt><a class="headerlink" href="#celery.worker.TaskWrapper.kwargs" title="Permalink to this definition">¶</a></dt>
    122. 

  122. <dd>Mapping of keyword arguments to apply to the task.</dd></dl>
    123. 

  123. 

  124. <dl class="attribute">
    125. 

  125. <dt id="celery.worker.TaskWrapper.message">
    126. 

  126. <tt class="descname">message</tt><a class="headerlink" href="#celery.worker.TaskWrapper.message" title="Permalink to this definition">¶</a></dt>
    127. 

  127. <dd>The original message sent. Used for acknowledging the message.</dd></dl>
    128. 

  128. 

  129. <dl class="method">
    130. 

  130. <dt id="celery.worker.TaskWrapper.execute">
    131. 

  131. <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>
    132. 

  132. <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
    133. 

  133. and status in the task meta backend.</p>
    134. 

  134. <table class="docutils field-list" frame="void" rules="none">
    135. 

  135. <col class="field-name" />
    136. 

  136. <col class="field-body" />
    137. 

  137. <tbody valign="top">
    138. 

  138. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    139. 

  139. <li><em>loglevel</em> &#8211; The loglevel used by the task.</li>
    140. 

  140. <li><em>logfile</em> &#8211; The logfile used by the task.</li>
    141. 

  141. </ul>
    142. 

  142. </td>
    143. 

  143. </tr>
    144. 

  144. </tbody>
    145. 

  145. </table>
    146. 

  146. </dd></dl>
    147. 

  147. 

  148. <dl class="method">
    149. 

  149. <dt id="celery.worker.TaskWrapper.execute_using_pool">
    150. 

  150. <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>
    151. 

  151. <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>
    152. 

  152. <table class="docutils field-list" frame="void" rules="none">
    153. 

  153. <col class="field-name" />
    154. 

  154. <col class="field-body" />
    155. 

  155. <tbody valign="top">
    156. 

  156. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    157. 

  157. <li><em>pool</em> &#8211; A <tt class="xref docutils literal"><span class="pre">multiprocessing.Pool</span></tt> instance.</li>
    158. 

  158. <li><em>loglevel</em> &#8211; The loglevel used by the task.</li>
    159. 

  159. <li><em>logfile</em> &#8211; The logfile used by the task.</li>
    160. 

  160. </ul>
    161. 

  161. </td>
    162. 

  162. </tr>
    163. 

  163. </tbody>
    164. 

  164. </table>
    165. 

  165. <p>:returns <tt class="xref docutils literal"><span class="pre">multiprocessing.AsyncResult</span></tt> instance.</p>
    166. 

  166. </dd></dl>
    167. 

  167. 

  168. <dl class="method">
    169. 

  169. <dt id="celery.worker.TaskWrapper.extend_with_default_kwargs">
    170. 

  170. <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>
    171. 

  171. <dd><p>Extend the tasks keyword arguments with standard task arguments.</p>
    172. 

  172. <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>
    173. 

  173. </dd></dl>
    174. 

  174. 

  175. <dl class="classmethod">
    176. 

  176. <dt id="celery.worker.TaskWrapper.from_message">
    177. 

  177. <em class="property">
    178. 

  178. classmethod </em><tt class="descname">from_message</tt><big>(</big><em>message</em>, <em>message_data</em>, <em>logger</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.from_message" title="Permalink to this definition">¶</a></dt>
    179. 

  179. <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
    180. 

  180. <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>
    181. 

  181. <table class="docutils field-list" frame="void" rules="none">
    182. 

  182. <col class="field-name" />
    183. 

  183. <col class="field-body" />
    184. 

  184. <tbody valign="top">
    185. 

  185. <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>
    186. 

  186. <tr><td>&nbsp;</td><td class="field-body">if the message does not describe a task,
    187. 

  187. the message is also rejected.</td>
    188. 

  188. </tr>
    189. 

  189. <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>
    190. 

  190. </tr>
    191. 

  191. </tbody>
    192. 

  192. </table>
    193. 

  193. </dd></dl>
    194. 

  194. 

  195. <dl class="method">
    196. 

  196. <dt id="celery.worker.TaskWrapper.on_failure">
    197. 

  197. <tt class="descname">on_failure</tt><big>(</big><em>exc_info</em>, <em>meta</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.on_failure" title="Permalink to this definition">¶</a></dt>
    198. 

  198. <dd>The handler used if the task raised an exception.</dd></dl>
    199. 

  199. 

  200. <dl class="method">
    201. 

  201. <dt id="celery.worker.TaskWrapper.on_success">
    202. 

  202. <tt class="descname">on_success</tt><big>(</big><em>ret_value</em>, <em>meta</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.on_success" title="Permalink to this definition">¶</a></dt>
    203. 

  203. <dd>The handler used if the task was successfully processed (
    204. 

  204. without raising an exception).</dd></dl>
    205. 

  205. 

  206. </dd></dl>
    207. 

  207. 

  208. <dl class="exception">
    209. 

  209. <dt id="celery.worker.UnknownTask">
    210. 

  210. <em class="property">
    211. 

  211. 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>
    212. 

  212. <dd>Got an unknown task in the queue. The message is requeued and
    213. 

  213. ignored.</dd></dl>
    214. 

  214. 

  215. <dl class="class">
    216. 

  216. <dt id="celery.worker.WorkController">
    217. 

  217. <em class="property">
    218. 

  218. class </em><tt class="descclassname">celery.worker.</tt><tt class="descname">WorkController</tt><big>(</big><em>concurrency=None</em>, <em>logfile=None</em>, <em>loglevel=None</em>, <em>is_detached=False</em><big>)</big><a class="headerlink" href="#celery.worker.WorkController" title="Permalink to this definition">¶</a></dt>
    219. 

  219. <dd><p>Executes tasks waiting in the task queue.</p>
    220. 

  220. <table class="docutils field-list" frame="void" rules="none">
    221. 

  221. <col class="field-name" />
    222. 

  222. <col class="field-body" />
    223. 

  223. <tbody valign="top">
    224. 

  224. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    225. 

  225. <li><em>concurrency</em> &#8211; see <a title="celery.worker.WorkController.concurrency" class="reference internal" href="#celery.worker.WorkController.concurrency"><tt class="xref docutils literal"><span class="pre">concurrency</span></tt></a>.</li>
    226. 

  226. <li><em>logfile</em> &#8211; see <a title="celery.worker.WorkController.logfile" class="reference internal" href="#celery.worker.WorkController.logfile"><tt class="xref docutils literal"><span class="pre">logfile</span></tt></a>.</li>
    227. 

  227. <li><em>loglevel</em> &#8211; see <a title="celery.worker.WorkController.loglevel" class="reference internal" href="#celery.worker.WorkController.loglevel"><tt class="xref docutils literal"><span class="pre">loglevel</span></tt></a>.</li>
    228. 

  228. </ul>
    229. 

  229. </td>
    230. 

  230. </tr>
    231. 

  231. </tbody>
    232. 

  232. </table>
    233. 

  233. <dl class="attribute">
    234. 

  234. <dt id="celery.worker.WorkController.concurrency">
    235. 

  235. <tt class="descname">concurrency</tt><a class="headerlink" href="#celery.worker.WorkController.concurrency" title="Permalink to this definition">¶</a></dt>
    236. 

  236. <dd>The number of simultaneous processes doing work (default:
    237. 

  237. <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>
    238. 

  238. 

  239. <dl class="attribute">
    240. 

  240. <dt id="celery.worker.WorkController.loglevel">
    241. 

  241. <tt class="descname">loglevel</tt><a class="headerlink" href="#celery.worker.WorkController.loglevel" title="Permalink to this definition">¶</a></dt>
    242. 

  242. <dd>The loglevel used (default: <tt class="xref docutils literal"><span class="pre">logging.INFO</span></tt>)</dd></dl>
    243. 

  243. 

  244. <dl class="attribute">
    245. 

  245. <dt id="celery.worker.WorkController.logfile">
    246. 

  246. <tt class="descname">logfile</tt><a class="headerlink" href="#celery.worker.WorkController.logfile" title="Permalink to this definition">¶</a></dt>
    247. 

  247. <dd>The logfile used, if no logfile is specified it uses <tt class="docutils literal"><span class="pre">stderr</span></tt>
    248. 

  248. (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>
    249. 

  249. 

  250. <dl class="attribute">
    251. 

  251. <dt id="celery.worker.WorkController.logger">
    252. 

  252. <tt class="descname">logger</tt><a class="headerlink" href="#celery.worker.WorkController.logger" title="Permalink to this definition">¶</a></dt>
    253. 

  253. <dd>The <tt class="xref docutils literal"><span class="pre">logging.Logger</span></tt> instance used for logging.</dd></dl>
    254. 

  254. 

  255. <dl class="attribute">
    256. 

  256. <dt id="celery.worker.WorkController.pool">
    257. 

  257. <tt class="descname">pool</tt><a class="headerlink" href="#celery.worker.WorkController.pool" title="Permalink to this definition">¶</a></dt>
    258. 

  258. <dd>The <tt class="xref docutils literal"><span class="pre">multiprocessing.Pool</span></tt> instance used.</dd></dl>
    259. 

  259. 

  260. <dl class="attribute">
    261. 

  261. <dt id="celery.worker.WorkController.task_consumer">
    262. 

  262. <tt class="descname">task_consumer</tt><a class="headerlink" href="#celery.worker.WorkController.task_consumer" title="Permalink to this definition">¶</a></dt>
    263. 

  263. <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>
    264. 

  264. 

  265. <dl class="method">
    266. 

  266. <dt id="celery.worker.WorkController.close_connection">
    267. 

  267. <tt class="descname">close_connection</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.WorkController.close_connection" title="Permalink to this definition">¶</a></dt>
    268. 

  268. <dd>Close the AMQP connection.</dd></dl>
    269. 

  269. 

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

  271. <dt id="celery.worker.WorkController.connection_diagnostics">
    272. 

  272. <tt class="descname">connection_diagnostics</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.WorkController.connection_diagnostics" title="Permalink to this definition">¶</a></dt>
    273. 

  273. <dd>Diagnose the AMQP connection, and reset connection if
    274. 

  274. necessary.</dd></dl>
    275. 

  275. 

  276. <dl class="method">
    277. 

  277. <dt id="celery.worker.WorkController.process_task">
    278. 

  278. <tt class="descname">process_task</tt><big>(</big><em>message_data</em>, <em>message</em><big>)</big><a class="headerlink" href="#celery.worker.WorkController.process_task" title="Permalink to this definition">¶</a></dt>
    279. 

  279. <dd>Process task message by passing it to the pool of workers.</dd></dl>
    280. 

  280. 

  281. <dl class="method">
    282. 

  282. <dt id="celery.worker.WorkController.reset_connection">
    283. 

  283. <tt class="descname">reset_connection</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.WorkController.reset_connection" title="Permalink to this definition">¶</a></dt>
    284. 

  284. <dd><p>Reset the AMQP connection, and reinitialize the
    285. 

  285. <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>
    286. 

  286. <p>Resets the task consumer in <a title="celery.worker.WorkController.task_consumer" class="reference internal" href="#celery.worker.WorkController.task_consumer"><tt class="xref docutils literal"><span class="pre">task_consumer</span></tt></a>.</p>
    287. 

  287. </dd></dl>
    288. 

  288. 

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

  290. <dt id="celery.worker.WorkController.run">
    291. 

  291. <tt class="descname">run</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.WorkController.run" title="Permalink to this definition">¶</a></dt>
    292. 

  292. <dd>Starts the workers main loop.</dd></dl>
    293. 

  293. 

  294. <dl class="method">
    295. 

  295. <dt id="celery.worker.WorkController.shutdown">
    296. 

  296. <tt class="descname">shutdown</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.WorkController.shutdown" title="Permalink to this definition">¶</a></dt>
    297. 

  297. <dd>Make sure <tt class="docutils literal"><span class="pre">celeryd</span></tt> exits cleanly.</dd></dl>
    298. 

  298. 

  299. </dd></dl>
    300. 

  300. 

  301. <dl class="function">
    302. 

  302. <dt id="celery.worker.jail">
    303. 

  303. <tt class="descclassname">celery.worker.</tt><tt class="descname">jail</tt><big>(</big><em>task_id</em>, <em>task_name</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>
    304. 

  304. <dd><p>Wraps the task in a jail, which catches all exceptions, and
    305. 

  305. saves the status and result of the task execution to the task
    306. 

  306. meta backend.</p>
    307. 

  307. <p>If the call was successful, it saves the result to the task result
    308. 

  308. backend, and sets the task status to <tt class="docutils literal"><span class="pre">&quot;DONE&quot;</span></tt>.</p>
    309. 

  309. <p>If the call results in an exception, it saves the exception as the task
    310. 

  310. result, and sets the task status to <tt class="docutils literal"><span class="pre">&quot;FAILURE&quot;</span></tt>.</p>
    311. 

  311. <table class="docutils field-list" frame="void" rules="none">
    312. 

  312. <col class="field-name" />
    313. 

  313. <col class="field-body" />
    314. 

  314. <tbody valign="top">
    315. 

  315. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    316. 

  316. <li><em>task_id</em> &#8211; The id of the task.</li>
    317. 

  317. <li><em>task_name</em> &#8211; The name of the task.</li>
    318. 

  318. <li><em>func</em> &#8211; Callable object to execute.</li>
    319. 

  319. <li><em>args</em> &#8211; List of positional args to pass on to the function.</li>
    320. 

  320. <li><em>kwargs</em> &#8211; Keyword arguments mapping to pass on to the function.</li>
    321. 

  321. </ul>
    322. 

  322. </td>
    323. 

  323. </tr>
    324. 

  324. <tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the function return value on success, or
    325. 

  325. the exception instance on failure.</p>
    326. 

  326. </td>
    327. 

  327. </tr>
    328. 

  328. </tbody>
    329. 

  329. </table>
    330. 

  330. </dd></dl>
    331. 

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    342. 

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