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    <title>clSetCommandQueueProperty</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="clSetCommandQueueProperty"></a>
        <h1>clSetCommandQueueProperty</h1>
        <p>Enable or disable the properties of a command-queue.</p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="scalarDataTypes.html" target="_top">cl_int</a> <strong class="fsfunc">clSetCommandQueueProperty</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">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_properties" target="_top">cl_command_queue_properties</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">properties</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_bool" target="_top">cl_bool</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">enable</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_command_queue_properties" target="_top">cl_command_queue_properties</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*old_properties</var><code>)</code></td>
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      <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">properties</code>
              </span>
            </dt>
            <dd>
              <p>Specifies the new command-queue properties to be applied to <code class="varname">command_queue</code>. Only command-queue properties specified for <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a> can be set in <code class="varname">properties</code>; otherwise the value specified in <code class="varname">properties</code> is considered to be not valid.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">enable</code>
              </span>
            </dt>
            <dd>
              <p>Determines whether the values specified by <code class="varname">properties</code> are enabled (if <code class="varname">enable</code> is <code class="constant">CL_TRUE</code>) or disabled (if <code class="varname">enable</code> is <code class="constant">CL_FALSE</code>) for the command-queue. The allowed property values are the same as those specified for <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">old_properties</code>
              </span>
            </dt>
            <dd>
              <p>Returns the command-queue properties before they were changed by
<code class="function">clSetCommandQueueProperty</code>. If <code class="varname">old_properties</code> is NULL, it is ignored.</p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
            As specified for  <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>, the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> command-queue property determines whether the commands in a command-queue are executed in-order or out-of-order. Changing this command-queue property will cause the OpenCL implementation to block until all previously queued commands in <code class="varname">command_queue</code> have completed. This can be an expensive operation and therefore changes to the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> property should be only done when absolutely necessary.
		</p>
        <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 command-queue properties are successfully updated. Otherwise, it returns the following:</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 the values specified in  <code class="varname">properties</code> are not valid.
		</li>
            <li class="listitem" style="list-style-type: disc">
			Returns <span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if the values specified in  <code class="varname">properties</code> are not supported by the device.
		</li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p><img src="pdficon_small1.gif" />
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=49" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
<a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>, 
<a class="citerefentry" href="clGetCommandQueueInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetCommandQueueInfo</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>
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