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    <title>clEnqueueSVMMap</title>
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    <div class="refentry">
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      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueSVMMap"></a>
        <h1>
            clEnqueueSVMMap
        </h1>
        <p>
            Enqueues a command that will allow the host to update a region of a SVM buffer
        </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">clEnqueueSVMMap</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="enums.html#cl_bool" target="pagedisplay">cl_bool</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">blocking_map</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_map_flags" target="pagedisplay">cl_map_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">map_flags</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_ptr</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">size</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>
                        Must be a valid host command-queue.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> blocking_map </code> </span>
            </dt>
            <dd>
              <p>
                      Indicates if the map operation is <code class="varname">blocking</code> or
                      <code class="varname">non-blocking</code>.
                    </p>
              <p>
                      If <code class="varname">blocking_map</code> is <code class="constant">CL_TRUE</code>,
                      <code class="function">clEnqueueSVMMap</code> does not return until the application can 
                      access the contents of the SVM region specified by 
                      <code class="varname">svm_ptr</code> and <code class="varname">size</code> on the host.
                    </p>
              <p>
                      If <code class="varname">blocking_map</code> is <code class="constant">CL_FALSE</code>
                      i.e. map operation is non-blocking, the region specified by 
                        <code class="varname">svm_ptr</code> and <code class="varname">size</code> 
                        cannot be used until the map command has completed. 
                        The <code class="varname">event</code> argument 
                        returns an event object which can be used to query 
                        the execution status of the map command. 
                        When the map command is completed, the application 
                        can access the contents of the region 
                        specified by <code class="varname">svm_ptr</code> and 
                        <code class="varname">size</code>.
                    </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">map_flags</code>
              </span>
            </dt>
            <dd>
              <p>
                        A bit-bield with the following supported values.
                    </p>
              <div class="informaltable">
                <table border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_map_flags</th>
                      <th align="left">Description</th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MAP_READ</code>
                      </td>
                      <td align="left">
                    <p>
                        This flag specifies that the region being mapped in the memory
                        object is being mapped for reading.
                    </p>

                    <p>
                        The pointer returned by 
                        <code class="function">clEnqueueMap{Buffer|Image}</code>
                        is guaranteed to contain
                        the latest bits in the region being
                        mapped when the 
                        <code class="function">clEnqueueMap{Buffer|Image}</code>
                        command has completed.
                    </p>
                </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MAP_WRITE</code>
                      </td>
                      <td align="left">
                    <p>
                        This flag specifies that the region being mapped in the memory
                        object is being mapped for writing.
                    </p>

                    <p>
                        The pointer returned by 
                        <code class="function">clEnqueueMap{Buffer|Image}</code>
                        is guaranteed to contain the latest bits in
                        the region being mapped when the 
                        <code class="function">clEnqueueMap{Buffer|Image}</code>
                        command has completed.
                    </p>
                </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MAP_WRITE_INVALIDATE_REGION</code>
                      </td>
                      <td align="left">
                    <p>
                        This flag specifies that the region being mapped in the memory
                        object is being mapped for writing.
                    </p>

                    <p>
                        The contents of the region being mapped are to be discarded.
                        This is typically the case
                        when the region being mapped is overwritten by the host. This
                        flag allows the implementation
                        to no longer guarantee that the pointer returned by
                        <code class="function">clEnqueueMap{Buffer|Image}</code>
                        contains the latest bits in the region being
                        mapped which can be a significant performance enhancement.
                    </p>

                    <p>
                        <code class="constant">CL_MAP_READ</code> or <code class="constant">CL_MAP_WRITE</code>
                        and <code class="constant"> CL_MAP_WRITE_INVALIDATE_REGION</code>
                        are mutually exclusive.
                    </p>
                </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
            <dt>
              <span class="term"><code class="varname">svm_ptr</code> and <code class="varname">size</code></span>
            </dt>
            <dd>
              <p>
                        A pointer to a memory region and size in bytes 
                        that will be updated by the 
                        host. If <code class="varname">svm_ptr</code> is allocated using 
                        <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a> 
                        then it must be allocated from the same context 
                        from which <code class="varname">command_queue</code> was created.
                        Otherwise the behavior is undefined.
                    </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. If <code class="varname">event_wait_list</code>
                      is NULL, then this particular command 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. 
                      <a class="citerefentry" href="clEnqueueBarrierWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueBarrierWithWaitList</span></span></a> 
                      can be used instead. 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>
          Note that 
            since we are enqueuing a command with a SVM buffer, the region is already mapped in the host 
            address space.
        </p>
        <p>
            <a class="citerefentry" href="clEnqueueSVMMap.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMMap</span></span></a>, and 
            <a class="citerefentry" href="clEnqueueSVMUnmap.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMUnmap</span></span></a> 
            act as synchronization points for the region 
            of the SVM buffer specified in these calls.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          <code class="function">clEnqueueSVMMap</code> returns <code class="constant">CL_SUCCESS</code>
          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_CONTEXT</span> if the 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_VALUE</span> if <code class="varname">svm_ptr</code> is NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">size</code> 
                is 0 or if values specified in <code class="varname">map_flags</code> are not valid.
            </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_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST</span> 
                if the map operation is 
                blocking and the execution status of any of the 
                events in <code class="varname">event_wait_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=184" 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
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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