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  <div class="section" id="module-celery.worker">
<h1>Multiprocessing Worker - celery.worker<a class="headerlink" href="#module-celery.worker" title="Permalink to this headline">¶</a></h1>
<p>celery.worker</p>
<dl class="exception">
<dt id="celery.worker.EmptyQueue">
<em class="property">
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>
<dd>The message queue is currently empty.</dd></dl>

<dl class="class">
<dt id="celery.worker.TaskDaemon">
<em class="property">
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>
<dd><p>Executes tasks waiting in the task queue.</p>
<p><tt class="docutils literal"><span class="pre">concurrency</span></tt> is the number of simultaneous processes.</p>
<dl class="method">
<dt id="celery.worker.TaskDaemon.run">
<tt class="descname">run</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.worker.TaskDaemon.run" title="Permalink to this definition">¶</a></dt>
<dd>The worker server&#8217;s main loop.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.run_periodic_tasks">
<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>
<dd><p>Schedule all waiting periodic tasks for execution.</p>
<p>Returns list of <tt class="xref docutils literal"><span class="pre">celery.models.PeriodicTaskMeta</span></tt> objects.</p>
</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskDaemon.schedule_retry_tasks">
<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>
<dd>Reschedule all requeued tasks waiting for retry.</dd></dl>

</dd></dl>

<dl class="class">
<dt id="celery.worker.TaskWrapper">
<em class="property">
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>
<dd><p>Class defining a task to be run.</p>
<dl class="method">
<dt id="celery.worker.TaskWrapper.execute">
<tt class="descname">execute</tt><big>(</big><em>loglevel</em>, <em>logfile</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.execute" title="Permalink to this definition">¶</a></dt>
<dd>Execute the task in a <tt class="docutils literal"><span class="pre">jail()</span></tt> and store its result and status
in the task meta backend.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskWrapper.execute_using_pool">
<tt class="descname">execute_using_pool</tt><big>(</big><em>pool</em>, <em>loglevel</em>, <em>logfile</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.execute_using_pool" title="Permalink to this definition">¶</a></dt>
<dd>Like <tt class="docutils literal"><span class="pre">execute</span></tt>, but using the <tt class="docutils literal"><span class="pre">multiprocessing</span></tt> pool.</dd></dl>

<dl class="method">
<dt id="celery.worker.TaskWrapper.extend_kwargs_with_logging">
<tt class="descname">extend_kwargs_with_logging</tt><big>(</big><em>loglevel</em>, <em>logfile</em><big>)</big><a class="headerlink" href="#celery.worker.TaskWrapper.extend_kwargs_with_logging" title="Permalink to this definition">¶</a></dt>
<dd><p>Extend the tasks keyword arguments with standard task arguments.</p>
<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>
</dd></dl>

<dl class="classmethod">
<dt id="celery.worker.TaskWrapper.from_message">
<em class="property">
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>
<dd>Create a TaskWrapper from a message returned by
<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>.</dd></dl>

</dd></dl>

<dl class="exception">
<dt id="celery.worker.UnknownTask">
<em class="property">
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>
<dd>Got an unknown task in the queue. The message is requeued and
ignored.</dd></dl>

<dl class="function">
<dt id="celery.worker.jail">
<tt class="descclassname">celery.worker.</tt><tt class="descname">jail</tt><big>(</big><em>task_id</em>, <em>callable_</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#celery.worker.jail" title="Permalink to this definition">¶</a></dt>
<dd>Wraps the task in a jail which saves the status and result
of the task execution to the task meta backend.</dd></dl>

</div>


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