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<title>clSetCommandQueueProperty</title>
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<div class="refentry">
<a id="idm1"></a>
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<div xmlns="" class="refnamediv">
<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>
<div class="funcsynopsis">
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<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>
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<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>
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<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>
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<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>
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<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>
<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>
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