sdk/2.1/docs/man/xhtml/clGetCommandQueueInfo.html

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    <title>clGetCommandQueueInfo</title>
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    <div class="refentry">
      <a id="id-1"></a>
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      <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.
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