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<title>clGetCommandQueueInfo</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
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<body>
<div class="refentry">
<a id="id-1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clGetCommandQueueInfo"></a>
<h1>clGetCommandQueueInfo</h1>
<p>Query information about a command-queue.</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a>
<strong class="fsfunc">clGetCommandQueueInfo</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_command_queue_info" target="pagedisplay">cl_command_queue_info</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_name</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_value_size</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value_size_ret</var>
<code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="varname">command_queue</code>
</span>
</dt>
<dd>
<p>Specifies the command-queue being queried.</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_name</code>
</span>
</dt>
<dd>
<p>Specifies the information to query.</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_value_size</code>
</span>
</dt>
<dd>
<p>Specifies the size in bytes of memory pointed to by
<code class="varname">param_value</code>. This size must be ≥ size
of return type as described in the table below.
If <code class="varname">param_value</code> is NULL, it is ignored.</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_value</code>
</span>
</dt>
<dd>
<p>A pointer to memory where the appropriate result being queried
is returned. If <code class="varname">param_value</code> is NULL, it is ignored.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_value_size_ret</code>
</span>
</dt>
<dd>
<p>Returns the actual size in bytes of data being queried by
<code class="varname">param_value</code>. If <code class="varname">param_value_size_ret</code>
is NULL, it is ignored.</p>
</dd>
<dt>
<span class="term"></span>
</dt>
<dd>
<p>
The list of supported <code class="varname">param_name</code> values and
the information returned in <code class="varname">param_value</code> by
<code class="function">clGetCommandQueueInfo</code> is described in the table below.
</p>
<div class="informaltable">
<table class="informaltable" border="1">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<thead>
<tr>
<th align="left">cl_command_queue_info</th>
<th align="left">Return Type and Information returned in param_value</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_QUEUE_CONTEXT</code>
</td>
<td align="left">
Return type: <span class="type">cl_context</span>
<p>Return the context specified when the command-queue is created.</p></td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_QUEUE_DEVICE</code>
</td>
<td align="left">
Return type: <span class="type">cl_device_id</span>
<p>Return the device specified when the command-queue is created.</p></td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_QUEUE_REFERENCE_COUNT</code>
</td>
<td align="left">
Return type: <span class="type">cl_uint</span>
<p>Return the command-queue reference count.</p>
<p>
The reference count returned with
<code class="constant">CL_QUEUE_REFERENCE_COUNT</code> should be considered
immediately stale. It is unsuitable for general use in applications. This
feature is provided for identifying memory leaks.
</p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_QUEUE_PROPERTIES</code>
</td>
<td align="left">
Return type: <span class="type">cl_command_queue_properties</span>
<p>
Return the currently specified properties for the command-queue. These
properties are specified by the value associated with the
<code class="constant">CL_COMMAND_QUEUE_PROPERTIES</code>
passed in <code class="varname">properties</code> argument in
<a class="citerefentry" href="clCreateCommandQueueWithProperties.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueueWithProperties</span></span></a>.
</p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_QUEUE_SIZE</code>
</td>
<td align="left">
Return type: <span class="type">cl_uint</span>
<p>
Return the currently specified size for the device command-queue.
This query is only supported for device command queues.
</p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_QUEUE_DEVICE_DEFAULT</code>
</td>
<td align="left">
Return type: <span class="type">cl_command_queue</span>
<p>
Return the current default command
queue for the underlying device.
</p>
</td>
</tr>
</tbody>
</table>
</div>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
It is possible that a device(s) becomes unavailable after a context and command-queues
that use this device(s) have been created and commands have been queued to
command-queues. In this case the behavior of OpenCL API calls that use this context
(and command-queues) are considered to be implementation-defined. The user callback
function, if specified, when the context is created can be used to record appropriate
information in the <code class="varname">errinfo</code>, <code class="varname">private_info</code>
arguments passed to the callback function when the device becomes unavailable.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns <span class="errorname">CL_SUCCESS</span> if the function is executed
successfully. Otherwise, it returns one of the following errors:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc">
Returns <span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if
<code class="varname">command_queue</code> is not a valid command-queue.
</li>
<li class="listitem" style="list-style-type: disc">
Returns <span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">param_name</code>
is not one of the supported values or if size in bytes specified by
<code class="varname">param_value_size</code> is less than size of return type and
<code class="varname">param_value</code> is not a NULL value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
</li>
</ul>
</div>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p><img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#page=101" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clCreateCommandQueueWithProperties.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueueWithProperties</span></span></a>,
<a class="citerefentry" href="clReleaseCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clReleaseCommandQueue</span></span></a>,
<a class="citerefentry" href="clRetainCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clRetainCommandQueue</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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