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<title>clSetUserEventStatus</title>
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<div class="refentry">
<a id="id-1"></a>
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<div xmlns="" class="refnamediv">
<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">
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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>
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<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>
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</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>
If there are enqueued commands with user events in the
<code class="varname">event_wait_list</code> argument of
<code class="function">clEnqueue***</code> commands, the user 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">
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<col align="left" class="col1" />
</colgroup>
<tbody>
<tr>
<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>
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<table class="informaltable" border="0">
<colgroup>
<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,...);
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="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#namedest=clSetUserEventStatus" 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 © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
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"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
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