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    <title>clSetUserEventStatus</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="clCreateBuffer"></a>
        <h1>
            clSetUserEventStatus
        </h1>
        <p>
            Sets the execution status of a user event 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="scalarDataTypes.html" target="pagedisplay">cl_int</a> <strong class="fsfunc">clSetUserEventStatus</strong>
                (</code>
                <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>, </td>
              </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">execution_status</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">event</code>
              </span>
            </dt>
            <dd>
              <p>
                      A user event object created using
                      <a class="citerefentry" href="clCreateUserEvent.html"><span class="citerefentry"><span class="refentrytitle">clCreateUserEvent</span></span></a>.
                    </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">execution_status</code>
              </span>
            </dt>
            <dd>
              <p>
                       Specifies the new execution
                      status to be set and can be <code class="constant">CL_COMPLETE</code> or
                      a negative integer value to indicate an error. A negative integer
                      value causes all enqueued commands that wait on this user event to be
                      terminated. <code class="function">clSetUserEventStatus</code> can only be called
                      once to change the execution status of <code class="varname">event</code>.
                    </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          Enqueued commands that specify user events in the <code class="varname">event_wait_list</code>
          argument of <code class="function">clEnqueue***</code> commands must ensure that the status of
          these user events being waited on are set using <code class="function">clSetUserEventStatus</code>
          before any OpenCL APIs that release OpenCL objects except for event objects are called;
          otherwise the behavior is undefined.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> if the function was executed
          successfully. Otherwise, it returns one of the following errors
        </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_EVENT</span> if <code class="varname">event</code> is not a valid user event.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if the <code class="varname">execution_status</code>
              is not <code class="constant">CL_COMPLETE</code> or a negative integer value.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if the
              <code class="varname">execution_status</code> for <code class="varname">event</code> has already been
              changed by a previous call to <code class="function">clSetUserEventStatus</code>.
            </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="refsect2">
        <a id="example1"></a>
        <h3>
            Example
        </h3>
        <p>
          For example, the following code sequence will result in undefined behavior of
          <a class="citerefentry" href="clReleaseMemObject.html"><span class="citerefentry"><span class="refentrytitle">clReleaseMemObject</span></span></a>.
        </p>
        <div class="informaltable">
          <table border="0">
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              <col align="left" class="col1" />
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                <td align="left">
ev1 = clCreateUserEvent(ctx, NULL);
clEnqueueWriteBuffer(cq, buf1, CL_FALSE, ..., 1, &amp;ev1, NULL;
clEnqueueWriteBuffer(cq, buf2, CL_FALSE,...);
clReleaseMemObject(buf2);
clSetUserEventStatus(ev1, CL_COMPLETE);
                        </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
            The following code sequence, however, works correctly.
        </p>
        <div class="informaltable">
          <table border="0">
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              <col align="left" class="col1" />
            </colgroup>
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                <td align="left">
ev1 = clCreateUserEvent(ctx, NULL);
clEnqueueWriteBuffer(cq, buf1, CL_FALSE, ..., 1, &amp;ev1, NULL;
clEnqueueWriteBuffer(cq, buf2, CL_FALSE,...);
clSetUserEventStatus(ev1, CL_COMPLETE);
clReleaseMemObject(buf2);
                        </td>
              </tr>
            </tbody>
          </table>
        </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=178" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clCreateUserEvent.html"><span class="citerefentry"><span class="refentrytitle">clCreateUserEvent</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
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