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    <title>clFlush</title>
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    <div class="refentry">
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        <a xmlns="http://www.w3.org/1999/xhtml" id="clFlush"></a>
        <h1>
            clFlush
        </h1>
        <p>
            Issues all previously queued OpenCL commands in a command-queue to the device associated with the command-queue.
        </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">clFlush</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>
                <code>)</code></td>
              </td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          Issues all previously queued OpenCL commands in <code class="varname">command_queue</code>
          to the device associated with <code class="varname">command_queue</code>.
        </p>
        <p>
          <code class="function">clFlush</code> only guarantees that all queued commands to
          <code class="varname">command_queue</code> will eventually be submitted to the appropriate device
          There is no guarantee that they will be complete after <code class="function">clFlush</code>
          returns.
        </p>
        <p>
          Any blocking commands queued in a command-queue and
          <a class="citerefentry" href="clReleaseCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clReleaseCommandQueue</span></span></a>
          perform an implicit flush of the command-queue.  These blocking commands are
          <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</span></span></a>,
          <a class="citerefentry" href="clEnqueueReadBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBufferRect</span></span></a>,
          <a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a>,
          with <code class="varname">blocking_read</code> set to <code class="constant">CL_TRUE</code>;
          <a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>,
          <a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a>,
          <a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>
          with <code class="varname">blocking_write</code> set to <code class="constant">CL_TRUE</code>;
          <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a>,
          <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>
          with <code class="varname">blocking_map</code> set to <code class="constant">CL_TRUE</code>; 
            <a class="citerefentry" href="clEnqueueSVMMemcpy.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMMemcpy</span></span></a> 
            with <code class="varname">blocking_copy</code> set to <code class="constant">CL_TRUE</code>; 
            <a class="citerefentry" href="clEnqueueSVMMap.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMMap</span></span></a> 
            with <code class="varname">blocking_map</code> set to <code class="constant">CL_TRUE</code>
            or
          <a class="citerefentry" href="clWaitForEvents.html"><span class="citerefentry"><span class="refentrytitle">clWaitForEvents</span></span></a>.
        </p>
        <p>
          To use event objects that refer to commands enqueued in a command-queue as event objects
          to wait on by commands enqueued in a different command-queue, the application must call
          a <code class="function">clFlush</code> or any blocking commands that perform an implicit flush
          of the command-queue where the commands that refer to these event objects are enqueued.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
            Returns <span class="errorname">CL_SUCCESS</span> if the function call 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_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_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=266" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clFinish.html"><span class="citerefentry"><span class="refentrytitle">clFinish</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
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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