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<title>clWaitForEvents</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="clWaitForEvents"></a>
<h1>
clWaitForEvents
</h1>
<p>
Waits on the host thread for commands identified by event objects to complete.
</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">clWaitForEvents</strong>
(</code>
<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</var>, </td>
</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_list</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_list</code>
</span>
</dt>
<dd>
<p>
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Waits on the host thread for commands identified by event objects in
<code class="varname">event_list</code> to complete. A command is considered complete if its
execution status is <code class="constant">CL_COMPLETE</code> or a negative value. The events
specified in <code class="varname">event_list</code> act as synchronization points.
</p>
<p>
If the
<a class="citerefentry" href="cl_khr_gl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_event</span></span></a> extension
is enabled, event objects can also be used to reflect the status of an OpenGL sync
object. The sync object in turn refers to a fence command executing in an OpenGL
command stream. This provides another method of coordinating sharing of buffers and
images between OpenGL and OpenCL.
</p>
<p>
If the
<a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a> extension
is enabled,
Event objects can also be used to reflect the status of an EGL
fence sync object. The sync object in turn refers to a fence
command executing in an EGL client API command stream. This
provides another method of coordinating sharing of EGL / EGL
client API objects with OpenCL. Completion of EGL / EGL client
API commands may be determined by placing an EGL fence command
after commands using <code class="code">eglCreateSyncKHR</code>, creating an
event from the resulting EGL sync object using
<a class="citerefentry" href="clCreateEventFromEGLSyncKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateEventFromEGLSyncKHR</span></span></a>
and then specifying it in the <code class="varname">event_wait_list</code>
of a <code class="function">clEnqueueAcquire***</code> command. This
method may be considerably more efficient than calling operations
like <code class="code">glFinish</code>, and is referred to as
<span class="emphasis"><em>explicit synchronization</em></span>. The application
is responsible for ensuring the command stream associated with
the EGL fence is flushed to ensure the CL queue is submitted to
the device. Explicit synchronization is most useful when an EGL
client API context bound to another thread is accessing the
memory objects."
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns <span class="errorname">CL_SUCCESS</span> if the execution status of all
events in <code class="varname">event_list</code> is <code class="constant">CL_COMPLETE</code>.
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_VALUE</span> if <code class="varname">num_events</code> is zero
or <code class="varname">event_list</code> is NULL..
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if events specified in
<code class="varname">event_list</code> do not belong to the same context.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT</span> if event objects specified in
<code class="varname">event_list</code> are not valid event objects.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST</span> if the
execution status of any of the events in <code class="varname">event_list</code> is a
negative integer value.
</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="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#page=251" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clGetEventInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetEventInfo</span></span></a>,
<a class="citerefentry" href="clReleaseEvent.html"><span class="citerefentry"><span class="refentrytitle">clReleaseEvent</span></span></a>,
<a class="citerefentry" href="clRetainEvent.html"><span class="citerefentry"><span class="refentrytitle">clRetainEvent</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="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</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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