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    <title>clEnqueueNativeKernel</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="clEnqueueNativeKernel"></a>
        <h1>clEnqueueNativeKernel</h1>
        <p>
            Enqueues a command to execute a native C/C++ function not compiled using the OpenCL compiler.
        </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">
                        clEnqueueNativeKernel
                    </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="scalarDataTypes.html" target="pagedisplay">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">(*user_func)(void *)</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">*args</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">cb_args</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_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_mem_objects</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*mem_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <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">**args_mem_loc</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_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</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>
                       A valid command-queue. A native user
                      function can only be executed on a command-queue created on a device
                      that has <code class="constant">CL_EXEC_NATIVE_KERNEL</code> capability
                      set in <code class="constant">CL_DEVICE_EXECUTION_CAPABILITIES</code>
                      as specified in the table of OpenCL Device Queries for
                      <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> user_func </code> </span>
            </dt>
            <dd>
              <p> 
                         A pointer to a host-callable user function.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> args </code> </span>
            </dt>
            <dd>
              <p> 
                         A pointer to the args list that <code class="varname">user_func</code> should be called with.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> cb_args </code> </span>
            </dt>
            <dd>
              <p> 
                        The size in bytes of the args list that <code class="varname">args</code> points to.
                    </p>
              <p>
                      The data pointed to by <code class="varname">args</code> and <code class="varname">cb_args</code>
                      bytes in size will be copied and a pointer to this copied region will be
                      passed to <code class="varname">user_func</code>. The copy needs to be done because
                      the memory objects (<span class="type">cl_mem</span> values) that <code class="varname">args</code>
                      may contain need to be modified and replaced by appropriate pointers to
                      global memory.  When <code class="function">clEnqueueNativeKernel</code> returns,
                      the memory region pointed to by <code class="varname">args</code> can be reused by
                      the application.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> num_mem_objects </code> </span>
            </dt>
            <dd>
              <p> 
                         The number of buffer objects that are passed in <code class="varname">args</code>.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> mem_list </code> </span>
            </dt>
            <dd>
              <p>
                       A list of valid buffer objects,
                      if <code class="varname">num_mem_objects</code> &gt; 0. The buffer
                      object values specified in <code class="varname">mem_list</code> are
                      memory object handles (<span class="type">cl_mem</span> values) returned by
                      <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>
                      or NULL.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> args_mem_loc </code> </span>
            </dt>
            <dd>
              <p>
                       A pointer to appropriate locations
                      that <code class="varname">args</code> points to where memory object handles
                      (<span class="type">cl_mem</span> values) are stored. Before the user function is
                      executed, the memory object handles are replaced by pointers to global
                      memory.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        event_wait_list
                    </code> and
                    <code class="varname"> 
                        num_events_in_wait_list
                    </code>
                </span>
            </dt>
            <dd>
              <p>
                       Specify events that need
                      to complete before this particular command can be executed. If
                      <code class="varname">event_wait_list</code> is NULL, then this particular command does
                      not wait on any event to complete. If <code class="varname">event_wait_list</code>
                      is NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If
                      <code class="varname">event_wait_list</code> is not NULL, the list of events
                      pointed to by <code class="varname">event_wait_list</code> must be valid
                      and <code class="varname">num_events_in_wait_list</code> must be greater
                      than 0.  The events specified in <code class="varname">event_wait_list</code>
                      act as synchronization points. The context associated with events in
                      <code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must
                      be the same.  The memory associated with <code class="varname">event_wait_list</code>
                      can be reused or freed after the function returns.
                    </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          The total number of read-only images specified as arguments to a kernel cannot exceed
          <code class="constant">CL_DEVICE_MAX_READ_IMAGE_ARGS</code>. Each 2D image array argument to
          a kernel declared with the <code class="code">read_only</code> qualifier counts as one image.
        </p>
        <p>
          The total number of write-only images specified as arguments to a kernel cannot exceed
          <code class="constant">CL_DEVICE_MAX_WRITE_IMAGE_ARGS</code>. Each 2D image array argument to
          a kernel declared with the <code class="code">write-only</code> qualifier counts as one image.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> if the user function execution instance
          was successfully queued, or one of the errors below:
        </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_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"><span class="errorname">CL_INVALID_CONTEXT</span> if context associated with
              <code class="varname">command_queue</code> and events in <code class="varname">event-wait_list</code>
              are not the same.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">user_func</code> is NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">args</code> is a NULL
              value and <code class="varname">cb_args</code> &gt; 0, or if <code class="varname">args</code> is a
              NULL value and <code class="varname">num_mem_objects</code> &gt; 0.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">args</code> is not NULL
              and <code class="varname">cb_args</code> is 0.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_mem_objects</code>
              &gt;  0 and <code class="varname">mem_list</code> or <code class="varname">args_mem_loc</code> are NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_mem_objects</code> =
              0 and <code class="varname">mem_list</code> or <code class="varname">args_mem_loc</code> are not NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if the device associated with
              <code class="varname">command_queue</code> cannot execute the native kernel.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if one or more memory objects
              specified in <code class="varname">mem_list</code> are not valid or are not buffer objects.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to queue the
              execution instance of <code class="varname">kernel</code> on the command-queue because of
              insufficient resources needed to execute the kernel.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure
              to allocate memory for data store associated with buffer objects specified as
              arguments to <code class="varname">kernel</code>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span>
              if <code class="varname">event_wait_list</code> is NULL and
              <code class="varname">num_events_in_wait_list</code> &gt; 0,
              or <code class="varname">event_wait_list</code> is not NULL and
              <code class="varname">num_events_in_wait_list</code> is 0, or if event objects in
              <code class="varname">event_wait_list</code> are not valid events.
            </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="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=174" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>,
            <a class="citerefentry" href="clEnqueueNativeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNativeKernel</span></span></a>,
            <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>,
            <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</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 © 2007-2011 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
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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