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    <title>clEnqueueBarrierWithWaitList</title>
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      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueBarrierWithWaitList"></a>
        <h1>
            clEnqueueBarrierWithWaitList
        </h1>
        <p>
            A synchronization point that enqueues a barrier operation.
        </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">cl_int</a>
                     <strong class="fsfunc">clEnqueueBarrierWithWaitList</strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_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">cl_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="abstractDataTypes.html" target="pagedisplay">cl_event</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="abstractDataTypes.html" target="pagedisplay">cl_event</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</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"> command_queue </code> </span>
            </dt>
            <dd>
              <p>
                        A valid host command queue.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
                        event_wait_list
                    </code>,
                    <code class="varname">
                        num_events_in_wait_list
                    </code>
                </span>
            </dt>
            <dd>
              <p>
                        Specify events that need to complete before this particular command can be executed.
                    </p>
              <p>
                      If <code class="varname">event_wait_list</code> is NULL,
                      <code class="varname">num_events_in_wait_list</code> must be 0. If
                      <code class="varname">event_wait_list</code> is not NULL, the list of events
                      pointed to by <code class="varname">event_wait_list</code> must be valid
                      and <code class="varname">num_events_in_wait_list</code> must be greater
                      than 0. The events specified in <code class="varname">event_wait_list</code>
                      act as synchronization points. The context associated with events in
                      <code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must
                      be the same. The memory associated with <code class="varname">event_wait_list</code>
                      can be reused or freed after the function returns.
                    </p>
              <p>
                      If <code class="varname">event_wait_list</code> is NULL, then this particular command
                      waits until all previous enqueued commands to command_queue have completed.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> event </code> </span>
            </dt>
            <dd>
              <p>
                      Returns an event object that identifies this particular command. Event
                      objects are unique and can be used to identify this barrier command
                      later on. <code class="varname">event</code> can be NULL in which case it
                      will not be possible for the application to query the status of
                      this command or queue a wait for this command to complete.  If the
                      <code class="varname">event_wait_list</code> and the <code class="varname">event</code>
                      arguments are not NULL, the <code class="varname">event</code> argument should not
                      refer to an element of the <code class="varname">event_wait_list</code> array.
                    </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          Enqueues a barrier command which waits for either a list of events to complete,
          or if the list is empty it waits for all commands previously enqueued in
          <code class="varname">command_queue</code> to complete before it completes. This command blocks
          command execution, that is, any following commands enqueued after it do not execute
          until it completes. This command returns an <code class="varname">event</code> which can be
          waited on, i.e. this event can be waited on to insure that all events either in the
          <code class="varname">event_wait_list</code> or all previously enqueued commands, queued before
          this command to <code class="varname">command_queue</code>, have completed.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> if the function was successfully executed.
          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_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
                is not a valid host command queue.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if 
                context associated with <code class="varname">command_queue</code>
                and events in <code class="varname">event_wait_list</code> are not the same.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_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> &gt; 0,
                or <code class="varname">event_wait_list</code> is not NULL and
                <code class="varname">num_events_in_wait_list</code> is 0, 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">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=260" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clEnqueueFillBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueFillBuffer</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBufferRect</span></span></a>,
            <a class="citerefentry" href="clEnqueueFillImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueFillImage</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImage</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyImageToBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImageToBuffer</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyBufferToImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBufferToImage</span></span></a>,
            <a class="citerefentry" href="clEnqueueUnmapMemObject.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueUnmapMemObject</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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