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    <title>enqueue_marker</title>
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    <div class="refentry">
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      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="enqueue_marker"></a>
        <h1>enqueue_marker</h1>
        <p>
            Enqueue a marker command to <code xmlns="http://www.w3.org/1999/xhtml" class="varname">queue</code>.
        </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">int</a>
                    <strong class="fsfunc">
                        enqueue_marker
                    </strong>
                (</code>
                <td>
                <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">queue_t</a>
                 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">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">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="otherDataTypes.html" target="pagedisplay">clk_event_t</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="otherDataTypes.html" target="pagedisplay">clk_event_t</a>
                * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event_ret</var>
            <code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            Enqueue a marker command to <code class="varname">queue</code>. 
            The marker command waits for a list of
            events to complete, or if the list is 
            empty it waits for all previously enqueued
            commands in <code class="varname">queue</code> 
            to complete before the marker completes.
        </p>
        <p>
            <code class="varname">event_ret</code> must not be NULL as otherwise this is a no-op.
        </p>
        <p>
            If an event is returned, <code class="function">enqueue_marker</code>
            performs an implicit retain on the returned event.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
            <code class="function">enqueue_marker</code> returns <span class="errorname">CL_SUCCESS</span> if the
            marked command is enqueued successfully and returns <span class="errorname">CL_ENQUEUE_FAILURE</span>
            otherwise. If the <code class="code">–g</code> compile option is specified in compiler options passed to 
            <a class="citerefentry" href="clCompileProgram.html"><span class="citerefentry"><span class="refentrytitle">clCompileProgram</span></span></a> or 
            <a class="citerefentry" href="clBuildProgram.html"><span class="citerefentry"><span class="refentrytitle">clBuildProgram</span></span></a>, the following
            errors may be returned instead of <span class="errorname">CL_ENQUEUE_FAILURE</span> to indicate 
            why <a class="citerefentry" href="enqueue_marker.html"><span class="citerefentry"><span class="refentrytitle">enqueue_marker</span></span></a> 
            failed to enqueue the marker command:
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_INVALID_QUEUE</span> if <code class="varname">queue</code> is not
                a valid device queue.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_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> is greater than zero, or if
                <code class="varname">event_wait_list</code> is not NULL and 
                <code class="varname">num_events_in_wait_list</code> is zero, 
                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">CLK_DEVICE_QUEUE_FULL</span> if <code class="varname">queue</code> is full.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_EVENT_ALLOCATION_FAILURE</span> if 
                <code class="varname">event_ret</code> is not NULL and an event could not be allocated.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_OUT_OF_RESOURCES</span>
                if there is a failure to queue the block in <code class="varname">queue</code> because of
                insufficient resources needed to execute the kernel.
            </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-openclc.pdf#page=170" target="OpenCL Spec">OpenCL Specification</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.
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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