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  <div class="section" id="module-celery.pool">
<h1>Task Pool - celery.pool<a class="headerlink" href="#module-celery.pool" title="Permalink to this headline">¶</a></h1>
<p>Process Pools.</p>
<dl class="class">
<dt id="celery.pool.TaskPool">
<em class="property">
class </em><tt class="descclassname">celery.pool.</tt><tt class="descname">TaskPool</tt><big>(</big><em>limit</em>, <em>logger=None</em><big>)</big><a class="headerlink" href="#celery.pool.TaskPool" title="Permalink to this definition">¶</a></dt>
<dd><p>Pool of running child processes, which starts waiting for the
processes to finish when the queue limit has been reached.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><em>limit</em> &#8211; see <a title="celery.pool.TaskPool.limit" class="reference internal" href="#celery.pool.TaskPool.limit"><tt class="xref docutils literal"><span class="pre">limit</span></tt></a> attribute.</li>
<li><em>logger</em> &#8211; see <a title="celery.pool.TaskPool.logger" class="reference internal" href="#celery.pool.TaskPool.logger"><tt class="xref docutils literal"><span class="pre">logger</span></tt></a> attribute.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="celery.pool.TaskPool.limit">
<tt class="descname">limit</tt><a class="headerlink" href="#celery.pool.TaskPool.limit" title="Permalink to this definition">¶</a></dt>
<dd>The number of processes that can run simultaneously until
we start collecting results.</dd></dl>

<dl class="attribute">
<dt id="celery.pool.TaskPool.logger">
<tt class="descname">logger</tt><a class="headerlink" href="#celery.pool.TaskPool.logger" title="Permalink to this definition">¶</a></dt>
<dd>The logger used for debugging.</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.add">
<tt class="descname">add</tt><big>(</big><em>result</em>, <em>callbacks</em>, <em>errbacks</em>, <em>tid</em>, <em>meta</em><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.add" title="Permalink to this definition">¶</a></dt>
<dd><p>Add a process to the queue.</p>
<p>If the queue is full, it will wait for the first task to finish,
collects its result and remove it from the queue, so it&#8217;s ready
to accept new processes.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Parameter:</th><td class="field-body"><em>result</em> &#8211; A <tt class="xref docutils literal"><span class="pre">multiprocessing.AsyncResult</span></tt> instance, as
returned by <tt class="xref docutils literal"><span class="pre">multiprocessing.Pool.apply_async()</span></tt>.</td>
</tr>
<tr class="field"><th class="field-name" colspan="2">Option callbacks:</th></tr>
<tr><td>&nbsp;</td><td class="field-body">List of callbacks to execute if the task was
successful. Must have the function signature:
<tt class="docutils literal"><span class="pre">mycallback(result,</span> <span class="pre">meta)</span></tt></td>
</tr>
<tr class="field"><th class="field-name" colspan="2">Option errbacks:</th></tr>
<tr><td>&nbsp;</td><td class="field-body">List of errbacks to execute if the task raised
and exception. Must have the function signature:
<tt class="docutils literal"><span class="pre">myerrback(exc,</span> <span class="pre">meta)</span></tt>.</td>
</tr>
<tr class="field"><th class="field-name">Option tid:</th><td class="field-body">The tid for this task (unqiue pool id).</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.apply_async">
<tt class="descname">apply_async</tt><big>(</big><em>target</em>, <em>args=None</em>, <em>kwargs=None</em>, <em>callbacks=None</em>, <em>errbacks=None</em>, <em>on_acknowledge=None</em>, <em>meta=None</em><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.apply_async" title="Permalink to this definition">¶</a></dt>
<dd><p>Equivalent of the :func:<tt class="docutils literal"><span class="pre">apply</span></tt> built-in function.</p>
<p>All <tt class="docutils literal"><span class="pre">callbacks</span></tt> and <tt class="docutils literal"><span class="pre">errbacks</span></tt> should complete immediately since
otherwise the thread which handles the result will get blocked.</p>
</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.full">
<tt class="descname">full</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.full" title="Permalink to this definition">¶</a></dt>
<dd><p>Is the pool full?</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="xref docutils literal"><span class="pre">True</span></tt> if the maximum number of concurrent processes
has been reached.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.get_worker_pids">
<tt class="descname">get_worker_pids</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.get_worker_pids" title="Permalink to this definition">¶</a></dt>
<dd>Returns the process id&#8217;s of all the pool workers.</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.on_ready">
<tt class="descname">on_ready</tt><big>(</big><em>ret_value</em>, <em>callbacks</em>, <em>errbacks</em>, <em>meta</em><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.on_ready" title="Permalink to this definition">¶</a></dt>
<dd>What to do when a worker task is ready and its return value has
been collected.</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.on_return">
<tt class="descname">on_return</tt><big>(</big><em>ret_val</em>, <em>tid</em>, <em>callbacks</em>, <em>errbacks</em>, <em>meta</em><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.on_return" title="Permalink to this definition">¶</a></dt>
<dd>What to do when the process returns.</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.reap">
<tt class="descname">reap</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.reap" title="Permalink to this definition">¶</a></dt>
<dd>Reap finished tasks.</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.run">
<tt class="descname">run</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.run" title="Permalink to this definition">¶</a></dt>
<dd><p>Run the task pool.</p>
<p>Will pre-fork all workers so they&#8217;re ready to accept tasks.</p>
</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.terminate">
<tt class="descname">terminate</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.terminate" title="Permalink to this definition">¶</a></dt>
<dd>Terminate the pool.</dd></dl>

<dl class="method">
<dt id="celery.pool.TaskPool.wait_for_result">
<tt class="descname">wait_for_result</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.pool.TaskPool.wait_for_result" title="Permalink to this definition">¶</a></dt>
<dd><p>Waits for the first process in the pool to finish.</p>
<p>This operation is blocking.</p>
</dd></dl>

</dd></dl>

</div>


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