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    <title>clCreateCommandQueueWithProperties</title>
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    <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="clCreateCommandQueueWithProperties"></a>
        <h1>clCreateCommandQueueWithProperties</h1>
        <p>Create a host or device command-queue on a specific device.</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="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a> <strong class="fsfunc">clCreateCommandQueueWithProperties</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_device_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_queue_properties" target="pagedisplay">cl_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="scalarDataTypes.html" target="pagedisplay">cl_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*errcode_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">context</code>
              </span>
            </dt>
            <dd>
              <p>
                    Must be a valid OpenCL context.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">device</code>
              </span>
            </dt>
            <dd>
              <p>
                    Must be a device or sub-device associated with <code class="varname">context</code>. 
                    It can either be in the list of devices and sub-devices specified when 
                    <code class="varname">context</code> is created using 
                    <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a> 
                    or be a root device with the same device type as specified 
                    when the <code class="varname">context</code> is created using 
                    <a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">properties</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies a list of properties for the 
                    command-queue and their corresponding values. 
                    Each property name is immediately followed 
                    by the corresponding desired value. The list is 
                    terminated with 0. The list of supported properties 
                    is described in the table below. If a 
                    supported property and its value is not specified in 
                    <code class="varname">properties</code>, its default value will be used. 
                    <code class="varname">properties</code> can be NULL in which case 
                    the default values for supported command-queue properties 
                    will be used.
                </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">Queue Properties</th>
                      <th align="left">Property Value</th>
                      <th align="left">Description</th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_PROPERTIES</code>
                      </td>
                      <td align="left">
                        <span class="type">cl_command_queue_-
properties</span>
                      </td>
                      <td align="left"><p>This is a bitfield and can be set to a 
                    combination of the following values:</p>

                    <p><code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> - 
                    Determines whether the 
                    commands queued in the command-queue 
                    are executed in-order or out-of-order. If 
                    set, the commands in the command-queue 
                    are executed out-of-order. Otherwise, 
                    commands are executed in-order.</p>

                    <p><code class="constant">CL_QUEUE_PROFILING_ENABLE</code> -
                    Enable or disable profiling of commands in 
                    the command-queue. If set, the profiling of 
                    commands is enabled. Otherwise profiling 
                    of commands is disabled.</p>

                    <p><code class="constant">CL_QUEUE_ON_DEVICE</code> - Indicates that this 
                    is a device queue. If <code class="constant">CL_QUEUE_ON_DEVICE</code>
                    is set, <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code>
                    must also be set. Only out-of-order device queues are supported.</p>

                    <p><code class="constant">CL_QUEUE_ON_DEVICE_DEFAULT</code> -
                    indicates that this is the default device 
                    queue. This can only be used with 
                    <code class="constant">CL_QUEUE_ON_DEVICE</code>.
                    The application must create the default device queue 
                    if any kernels containing calls to get_default_queue are
                    enqueued. There can only be one default device 
                    queue for each device within a context.
                    clCreateCommandQueueWithProperties with 
                    <code class="constant">CL_QUEUE_PROPERTIES</code> set to 
                    <code class="constant">CL_QUEUE_ON_DEVICE</code> |
                    <code class="constant">CL_QUEUE_ON_DEVICE_DEFAULT</code> 
                    will return the default device queue that has 
                    already been created and
                    increment its retain count by 1.
                    </p>

                    <p>If <code class="constant">CL_QUEUE_PROPERTIES</code> is not 
                    specified an in-order host command queue
                    is created for the specified device.</p>

            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_SIZE</code>
                      </td>
                      <td align="left">
                        <span class="type">cl_uint</span>
                      </td>
                      <td align="left"><p>Specifies the size of the device queue in 
                    bytes.</p>

                    <p>This can only be specified if 
                    <code class="constant">CL_QUEUE_ON_DEVICE</code> is set in 
                    <code class="constant">CL_QUEUE_PROPERTIES</code>. This must be a 
                    value ≤ <code class="constant">CL_DEVICE_QUEUE_ON_DEVICE_MAX_SIZE</code>.</p>

                    <p>For best performance, this should be ≤ 
                    <code class="constant">CL_DEVICE_QUEUE_ON_DEVICE_PREFERRED_SIZE</code>.</p>

                    <p>If <code class="constant">CL_QUEUE_SIZE</code> is not specified, the 
                    device queue is created with 
                    <code class="constant">CL_DEVICE_QUEUE_ON_DEVICE_PREFERRED_SIZE</code>
                    as the size of the queue.</p></td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_PRIORITY_KHR</code>
                      </td>
                      <td align="left">
                        <span class="type">cl_queue_priority_khr</span>
                      </td>
                      <td align="left">
                <p>
                    Applies only if the
                    <a class="citerefentry" href="cl_khr_priority_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_priority_hints</span></span></a>
                    extension is enabled.
                </p>

                <p>
                    Can be one of
                    <code class="constant">CL_QUEUE_PRIORITY_HIGH_KHR</code>,
                    <code class="constant">CL_QUEUE_PRIORITY_MED_KHR</code>, or
                    <code class="constant">CL_QUEUE_PRIORITY_LOW_KHR</code>.
                </p>

                <p>
                    If <code class="constant">CL_QUEUE_PRIORITY_KHR</code>
                    is not specified then the default priority is
                    <code class="constant">CL_QUEUE_PRIORITY_MED_KHR</code>.
                </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_THROTTLE_KHR</code>
                      </td>
                      <td align="left">
                        <span class="type"></span>
                      </td>
                      <td align="left">
                <p>
                    Applies only if the
                    <a class="citerefentry" href="cl_khr_throttle_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_throttle_hints</span></span></a>
                    extension is enabled.
                </p>

                <p>
                    Can be one of
                    <code class="constant">CL_QUEUE_THROTTLE_HIGH_KHR</code>,
                    <code class="constant">CL_QUEUE_THROTTLE_MED_KHR</code>,
                    <code class="constant">CL_QUEUE_THROTTLE_LOW_KHR</code>
                </p>

                <p>
                    If <code class="constant">CL_QUEUE_THROTTLE_KHR</code>
                    is not specified then the default priority is
                    <code class="constant">CL_QUEUE_THROTTLE_MED_KHR</code>.
                </p>
            </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">errcode_ret</code>
              </span>
            </dt>
            <dd>
              <p>
                    Returns an appropriate error code. If <code class="varname">errcode_ret</code> 
                    is <code class="constant">NULL</code>, no error code is returned.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          OpenCL objects such as memory, program and kernel objects are created using a
          context.  Operations on these objects are performed using  a command-queue. The
          command-queue can be used to queue a set of operations (referred to as commands)
          in order.  Having multiple command-queues allows applications to queue multiple
          independent commands without requiring synchronization.  Note that this should work
          as long as these objects are not being shared.  Sharing of objects across multiple
          command-queues will require the application to perform appropriate synchronization.
          This is described in Appendix A of the specification.
        </p>
        <h4><a id="id-1.6.3"></a>Out-of-order Execution of Kernels and Memory Object Commands</h4>
        <p>
      The OpenCL functions that are submitted to a command-queue are enqueued in the order
      the calls are made but can be configured to execute in-order or out-of-order. The
      <code class="varname">properties</code> argument in <code class="function">clCreateCommandQueueWithProperties</code>
      can be used to specify the execution order.
    </p>
        <p>
      If the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code>
      property of a command-queue is not set, the commands enqueued to a
      command-queue execute in order. For example, if an application calls
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
      to execute kernel A followed by a
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
      to execute kernel B, the application can assume that kernel A finishes first and then
      kernel B is executed. If the memory objects output by kernel A are inputs to kernel
      B then kernel B will see the correct data in memory objects produced by execution of
      kernel A. If the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> property
      of a command-queue is set, then there is no guarantee that kernel A will finish before
      kernel B starts execution.
    </p>
        <p>
      Applications can configure the commands enqueued to a command-queue to execute
      out-of-order by setting the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code>
      property of the command-queue. This can be specified when the command-queue is
      created. In out-of-order execution mode there is no guarantee that the enqueued
      commands will finish execution in the order they were queued. As there is no
      guarantee that kernels will be executed in order, i.e. based on when the
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
      calls are made within a command-queue, it is therefore possible that an earlier
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
      call to execute kernel A identified by event A may execute and/or finish later than a
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
      call to execute kernel B which was called by the application at a later
      point in time. To guarantee a specific order of execution of kernels, a
      wait on a particular event (in this case event A) can be used. The wait for
      event A can be specified in the <code class="varname">event_wait_list</code> argument to
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
      for kernel B.
    </p>
        <p>
      In addition, a wait for events
      (<a class="citerefentry" href="clEnqueueMarkerWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMarkerWithWaitList</span></span></a>)
      or a barrier
      (<a class="citerefentry" href="clEnqueueBarrierWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueBarrierWithWaitList</span></span></a>)
      command can be enqueued to the command-queue. The wait for events command ensures
      that previously enqueued commands identified by the list of events to wait for have
      finished before the next batch of commands is executed. The barrier command ensures
      that all previously enqueued commands in a command-queue have finished execution
      before the next batch of commands is executed.
    </p>
        <p>
      Similarly, commands to read, write, copy or map memory objects that are enqueued after
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> or
      <a class="citerefentry" href="clEnqueueNativeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNativeKernel</span></span></a>
      commands are not guaranteed to wait for kernels scheduled for execution to have
      completed (if the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code>
      property is set). To ensure correct ordering of commands, the event object returned by
      <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> or
      <a class="citerefentry" href="clEnqueueNativeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNativeKernel</span></span></a>
      can be used to enqueue a wait for event or a barrier command can be enqueued that
      must complete before reads or writes to the memory object(s) occur.
    </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
      <code class="function">clCreateCommandQueueWithProperties</code> 
      returns a valid non-zero command-queue and
      <code class="varname">errcode_ret</code> is set to <span class="errorname">CL_SUCCESS</span> if the
      command-queue is created successfully. Otherwise, it returns a NULL value with one
      of the following error values returned in <code class="varname">errcode_ret</code>:
    </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> is not a valid
        context.
      </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE</span> if <code class="varname">device</code> is not a valid
        device or is not associated with <code class="varname">context</code>.
      </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in
        <code class="varname">properties</code> are not valid.
      </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if values specified in
        <code class="varname">properties</code> are valid but are not supported by the device.
      </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>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if
        extension 
        <a class="citerefentry" href="cl_khr_priority_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_priority_hints</span></span></a>
        is enabled and
        the <code class="constant">CL_QUEUE_PRIORITY_KHR</code> property is
        specified and the queue is a <code class="constant">CL_QUEUE_ON_DEVICE</code>.
      </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if
        extension 
        <a class="citerefentry" href="cl_khr_throttle_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_throttle_hints</span></span></a>
        is enabled and
        the <code class="constant">CL_QUEUE_PRIORITY_KHR</code> property is
        specified and the queue is a <code class="constant">CL_QUEUE_ON_DEVICE</code>.
      </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=97" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <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>,
            <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>,
            <a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>,
            <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>
        </p>
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      <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
permit persons to whom the Materials are furnished to do so, subject to
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in all copies or substantial portions of the Materials.
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