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    <title>clEnqueueSVMFree</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="clEnqueueSVMFree"></a>
        <h1>
            clEnqueueSVMFree
        </h1>
        <p>
            Enqueues a command to free the shared virtual memory allocated using clSVMAlloc or a shared system memory pointer.
        </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">clEnqueueSVMFree</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_svm_pointers</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*svm_pointers[]</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> (CL_CALLBACK  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*pfn_free_func)
                (<a class="link" href="abstractDataTypes.html" target="pagedisplay">    cl_command_queue</a> queue, <a class="link" href="scalarDataTypes.html" target="_top">    cl_uint</a> num_svm_pointers,
                 <a class="link" href="scalarDataTypes.html" target="pagedisplay">    void</a> *svm_pointers[]</var>), </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">    void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam"> *user_data</var>), </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*user_data</var>, </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">svm_pointers and num_svm_pointers</code>
              </span>
            </dt>
            <dd>
              <p>
                        Specify shared virtual memory pointers to be freed. Each 
                        pointer in <code class="varname">svm_pointers</code> that was 
                        allocated using 
                        <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a> 
                        must have been allocated from the 
                        same context from which <code class="varname">command_queue</code> 
                        was created. The memory associated with 
                        <code class="varname">svm_pointers</code> can be reused or 
                        freed after the function returns.
                    </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">pfn_free_func</code>
              </span>
            </dt>
            <dd>
              <p>
                        Specifies the callback 
                        function to be called to free the SVM pointers. 
                        <code class="varname">pfn_free_func</code> takes four arguments: 
                        <code class="varname">queue</code> which is the command queue in which 
                        <code class="function">clEnqueueSVMFree</code> was enqueued, the 
                        count and list of SVM pointers to free and <code class="varname">user_data</code>
                        which is a pointer to user specified data. 
                        If <code class="varname">pfn_free_func</code> is NULL, all pointers specified in 
                        <code class="varname">svm_pointers</code> must be allocated using 
                        <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a> 
                        and the OpenCL implementation will free 
                        these SVM pointers. <code class="varname">pfn_free_func</code> must 
                        be a valid callback function if any SVM pointer to be 
                        freed is a shared system memory pointer i.e. not allocated 
                        using <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a>. 
                        If <code class="varname">pfn_free_func</code>
                        is a valid callback function, the OpenCL implementation 
                        will call <code class="varname">pfn_free_func</code> to free all the 
                        SVM pointers specified in <code class="varname">svm_pointers</code>.
                    </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">user_data</code>
              </span>
            </dt>
            <dd>
              <p>
                      Will be passed as the
                      <code class="varname">user_data</code> argument when <code class="varname">pfn_free_func</code>
                      is called. <code class="varname">user_data</code> can be NULL.
                    </p>
            </dd>
            <dt>
              <span class="term"><code class="varname">event_wait_list</code> and <code class="varname">num_events_in_wait_list</code></span>
            </dt>
            <dd>
              <p>
                        Specify events that need to complete before 
                        <code class="function">clEnqueueSVMFree</code> can be executed. If 
                        <code class="varname">event_wait_list</code> is NULL, then 
                        <code class="function">clEnqueueSVMFree</code>
                        does not wait on any event to complete. 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>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">event</code>
              </span>
            </dt>
            <dd>
              <p>
                        Returns an event object that 
                        identifies this particular command and can be used to query or 
                        queue a wait for this particular command to complete. 
                        <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="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> if the function is 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_INVALID_VALUE</span> if 
                <code class="varname">num_svm_pointers</code> is 0 and 
                <code class="varname">svm_pointers</code> is non-NULL, or if <code class="varname">svm_pointers</code> 
                is NULL and <code class="varname">num_svm_pointers</code> is not 0.
            </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#namedest=clEnqueueSVMFree" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="sharedVirtualMemory.html"><span class="citerefentry"><span class="refentrytitle">Shared Virtual Memory Functions</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
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