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    <title>clCreateEventFromGLsyncKHR</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="clCreateFromGLBuffer"></a>
        <h1>clCreateEventFromGLsyncKHR</h1>
        <p>
            Creates an event object linked to an OpenGL sync object.
        </p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                        <a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a>
                     <strong class="fsfunc">
                        clCreateEventFromGLsyncKHR
                    </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>GLsync <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sync</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>
                       A valid OpenCL context
                      created from an OpenGL context or share group, using the
                      <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a>
                      extension.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> sync </code> </span>
            </dt>
            <dd>
              <p> 
                        The name of a sync object in the GL share group associated with <code class="varname">context</code>.
                    </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            An event object may be created by linking to an OpenGL sync object. Completion of such an event
            object is equivalent to waiting for completion of the fence command associated with the linked
            GL sync object.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          The parameters of an event object linked to a GL sync
          object will return the following values when queried with
          <a class="citerefentry" href="clGetEventInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetEventInfo</span></span></a>:
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc">
              The <code class="constant">CL_EVENT_COMMAND_QUEUE</code> of a linked event is NULL,
              because the event is not associated with any OpenCL command queue.
            </li>
            <li class="listitem" style="list-style-type: disc">
              The <code class="constant">CL_EVENT_COMMAND_TYPE</code> of a linked event is
              <code class="constant">CL_COMMAND_GL_FENCE_SYNC_OBJECT_KHR</code>, indicating that the
              event is associated with a GL sync object, rather than an OpenCL command.
            </li>
            <li class="listitem" style="list-style-type: disc">
              The <code class="constant">CL_EVENT_COMMAND_EXECUTION_STATUS</code> of a linked
              event is either <code class="constant">CL_SUBMITTED</code>, indicating that the
              fence command associated with the sync object has  not yet completed, or
              <code class="constant">CL_COMPLETE</code>, indicating that the fence command has completed.
            </li>
          </ul>
        </div>
        <p>
          <code class="function">clCreateEventFromGLsyncKHR</code> performs an implicit
          <a class="citerefentry" href="clRetainEvent.html"><span class="citerefentry"><span class="refentrytitle">clRetainEvent</span></span></a> on the
          returned event object. Creating a linked event object also places a reference on
          the linked GL sync object. When the event object is deleted, the reference will be
          removed from the GL sync object.
        </p>
        <p>
          Events returned from <code class="function">clCreateEventFromGLsyncKHR</code> 
          can be used in the <code class="varname">event_wait_list</code> argument to 
          <a class="citerefentry" href="clEnqueueAcquireGLObjects.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireGLObjects</span></span></a>
          and CL APIs that take a <span class="type">cl_event</span> as an argument 
          but do not enqueue commands.
          Passing such events to any other CL API that enqueues 
          commands will generate a
          <span class="errorname">CL_INVALID_EVENT</span> error.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns a valid OpenCL event object and <code class="varname">errcode_ret</code> is set to
          <span class="errorname">CL_SUCCESS</span> if the event object 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 or was not created from a GL context.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_OBJECT</span> if <code class="varname">sync</code>
              is not the name of a sync object in the GL share group associated with
              <code class="varname">context</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-extensions.pdf#page=60" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a>,
            <a class="citerefentry" href="cl_khr_gl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_event</span></span></a>,
            <a class="citerefentry" href="clGetEventInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetEventInfo</span></span></a>,
            <a class="citerefentry" href="clEnqueueAcquireGLObjects.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireGLObjects</span></span></a>,
            <a class="citerefentry" href="clRetainEvent.html"><span class="citerefentry"><span class="refentrytitle">clRetainEvent</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 © 2007-2015 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
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