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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
              "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd" [
<!ENTITY mediaSurfaceFormatsInc SYSTEM "mediaSurfaceFormatsInc.xml">
<!ENTITY accessMappedInc SYSTEM "accessMappedInc.xml">
]>

<refentry>
    <refentryinfo>
        <keywordset><keyword>clEnqueueReleaseDX9MediaSurfacesKHR</keyword></keywordset>
    </refentryinfo>

    <refmeta>
        <refentrytitle>clEnqueueReleaseDX9MediaSurfacesKHR</refentrytitle>
        <refmiscinfo>
            <copyright>
                <year>2007-2011</year>
                <holder>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.</holder>
            </copyright>
        </refmiscinfo>
        <manvolnum>3</manvolnum>
    </refmeta>

<!-- ================================ SYNOPSIS -->

    <refnamediv id="clEnqueueReleaseDX9MediaSurfacesKHR">
        <refname>clEnqueueReleaseDX9MediaSurfacesKHR</refname>
        <refpurpose>Release OpenCL memory objects that have been created from media surfaces.</refpurpose>
    </refnamediv>

    <refsynopsisdiv xmlns:xlink="http://www.w3.org/1999/xlink"><title></title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>
                <link xlink:href="scalarDataTypes.html">cl_int</link>
                    <function>clEnqueueReleaseDX9MediaSurfacesKHR</function></funcdef>

                <paramdef><link xlink:href="abstractDataTypes.html">cl_command_queue</link>
                    <parameter>command_queue</parameter></paramdef>

                <paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link>
                    <parameter>num_objects</parameter></paramdef>

                <paramdef>const <link xlink:href="abstractDataTypes.html">cl_mem</link><parameter>*mem_objects</parameter></paramdef>

                <paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link><parameter>num_events_in_wait_list</parameter></paramdef>

                <paramdef>
                    const <link xlink:href="abstractDataTypes.html">cl_event</link>
                    <parameter>*event_wait_list</parameter>
                </paramdef>

                <paramdef><link xlink:href="abstractDataTypes.html">cl_event</link><parameter>*event</parameter></paramdef>
           </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>

<!-- ================================ PARAMETERS -->

    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>

    <varlistentry><!-- this param description is missing from the ext. spec p. 94, section 9.10.7.4 -->
            <term><varname>command_queue</varname></term>
            <listitem>
                <para>
                    A valid command-queue.
                </para>
            </listitem>
        </varlistentry>

        <varlistentry>
            <term><varname>num_objects</varname></term>
            <listitem>
                <para>
                    The number of memory objects to be released in <varname>mem_objects</varname>.
                </para>
            </listitem>
        </varlistentry>

        <varlistentry>
            <term><varname>mem_objects</varname></term>
            <listitem>
                <para>
                     A pointer to a list of OpenCL memory objects that were created from
                     media surfaces.
                </para>
            </listitem>
        </varlistentry>

        <varlistentry>
            <term><varname>num_events_in_wait_list</varname>, <varname>event_wait_list</varname></term>
            <listitem>
                <para>
                  Specify events that need to complete before this particular
                  command can be executed.  If <varname>event_wait_list</varname>
                  is NULL, then this particular command does not wait on any
                  event to complete. If <varname>event_wait_list</varname> is
                  NULL, <varname>num_events_in_wait_list</varname> must be 0. If
                  <varname>event_wait_list</varname> is not NULL, the list of events
                  pointed to by <varname>event_wait_list</varname> must be valid and
                  <varname>num_events_in_wait_list</varname> must be greater than 0.
                  The events specified in <varname>event</varname> 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.  <varname>event</varname> 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 <varname>event_wait_list</varname> and the event arguments are not
                  NULL, the <varname>event</varname> argument should not refer to an element
                  of the <varname>event_wait_list</varname> array.
                </para>
            </listitem>
        </varlistentry>

      </variablelist>
    </refsect1>

<!-- ================================ NOTES  -->

    <refsect1 id="notes"><title>Notes</title>
        <para>
          Used to release OpenCL memory objects that have been created from media
          surfaces. The media surfaces are released by the OpenCL context associated with
          <varname>command_queue</varname>.
        </para>

        <para>
          OpenCL memory objects created from media surfaces which have been acquired by OpenCL must
          be released by OpenCL before they may be accessed by the media adapter API. Accessing
          a media surface while its corresponding OpenCL memory object is acquired is in error
          and will result in undefined behavior, including but not limited to possible OpenCL
          errors, data corruption, and program termination.
        </para>

        <para>
          If <constant>CL_CONTEXT_INTEROP_USER_SYNC</constant> is not
          specified as <constant>CL_TRUE</constant> during context creation,
          <function>clEnqueueReleaseDX9MediaSurfacesKHR</function> provides the
          synchronization guarantee that any calls to media adapter APIs involving
          the interop device(s) used in the OpenCL context made after the call to
          <function>clEnqueueReleaseDX9MediaSurfacesKHR</function> will not start executing until
          after all events in <varname>event_wait_list</varname> are complete and all work already
          submitted to <varname>command_queue</varname> completes execution.  If the context was
          created with properties specifying <constant>CL_CONTEXT_INTEROP_USER_SYNC</constant>
          as <constant>CL_TRUE</constant>, the user is responsible for guaranteeing that any
          media adapter API calls involving the interop device(s) used in the OpenCL context made
          after <function>clEnqueueReleaseDX9MediaSurfacesKHR</function> will not start executing
          until after event returned by <function>clEnqueueReleaseDX9MediaSurfacesKHR</function>
          reports completion.
        </para>

        &mediaSurfaceFormatsInc;

        &accessMappedInc;

    </refsect1>

<!-- ================================ ERRORS  -->

    <refsect1 id="errors"><title>Errors</title>
        <para>
          Returns <errorname>CL_SUCCESS</errorname> returns <errorname>CL_SUCCESS</errorname>
          if the function is executed successfully. If <varname>num_objects</varname> is 0 and
          &lt;<varname>mem_objects</varname>&gt; is NULL then the function does nothing and returns
          <errorname>CL_SUCCESS</errorname>. Otherwise it returns one of the following errors:
        </para>

        <itemizedlist mark="disc">
            <listitem>
                <errorname>CL_INVALID_VALUE</errorname> if <varname>num_objects</varname> is zero and
                <varname>mem_objects</varname> is not a NULL value or if <varname>num_objects</varname>
                &gt; 0 and <varname>mem_objects</varname> is NULL.
            </listitem>

            <listitem>
                <errorname>CL_INVALID_MEM_OBJECT</errorname> if memory objects in <varname>mem_objects</varname>
                are not valid OpenCL memory objects or if memory objects in <varname>mem_objects</varname> have
                not been created from media surfaces.
            </listitem>

            <listitem>
                <errorname>CL_INVALID_COMMAND_QUEUE</errorname> if <varname>command_queue</varname> is not
                a valid command-queue.
            </listitem>

            <listitem>
                <errorname>CL_INVALID_CONTEXT</errorname> if context associated with
                <varname>command_queue</varname> was not created from a media object.
            </listitem>

            <listitem>
                <errorname>CL_DX9_MEDIA_SURFACE_NOT_ACQUIRED_KHR</errorname> if memory objects in
                <varname>mem_objects</varname> have not been previously been acquired using
                <function>clEnqueueAcquireDX9MediaSurfacesKHR</function> or have been released using
                <citerefentry><refentrytitle>clEnqueueReleaseDX9MediaSurfacesKHR</refentrytitle></citerefentry>
                since the last time that they were acquired.
            </listitem>

            <listitem>
                <errorname>CL_INVALID_EVENT_WAIT_LIST</errorname> if <varname>event_wait_list</varname> is
                NULL and <varname>num_event_in_wait_list</varname> &gt; 0, or <varname>event_wait_list</varname>
                is  not NULL and <varname>num_event_in_wait_list</varname> is 0, or if event objects in
                <varname>event_wait_list</varname> are not valid events.
            </listitem>

            <listitem>
                <errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate
                resources required by the OpenCL implementation on the host.
            </listitem>

        </itemizedlist>
    </refsect1>

<!-- ================================ EXAMPLE  -->
<!-- DO NOT DELETE IN CASE AN EXAMPLE IS ADDED IN THE FUTURE -->
<!--
    <refsect2 id="example1">
        <title>
            Example
        </title>

        <informaltable frame="none">
            <tgroup cols="1" align="left" colsep="0" rowsep="0">
                <colspec colname="col1" colnum="1" />
                <tbody>
                    <row>
                        <entry>
                            Example goes here - it will be set in "code" type with white space preserved.
                        </entry>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect2>
-->

<!-- ================================ SPECIFICATION  -->
<!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page
-->
    <refsect1 id="specification"><title>Specification</title>
        <para><imageobject><imagedata fileref="pdficon_small1.gif" format="gif" /></imageobject>
            <olink uri="clEnqueueReleaseDX9MediaSurfacesKHR">OpenCL Specification</olink>
        </para>
    </refsect1>

<!-- ================================ ALSO SEE  -->

    <refsect1 id="seealso"><title>Also see</title>
        <para>
            <citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clGetDeviceIDsFromDX9MediaAdapterKHR</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clCreateFromDX9MediaSurfaceKHR</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clEnqueueAcquireDX9MediaSurfacesKHR</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clEnqueueReleaseDX9MediaSurfacesKHR</refentrytitle></citerefentry>
        </para>
    </refsect1>

<!-- ============================== COPYRIGHT -->
<!-- Content included from copyright.inc.xsl -->

    <refsect3 id="Copyright"><title></title>
        <imageobject>
                <imagedata fileref="KhronosLogo.jpg" format="jpg" />
        </imageobject>
        <para />
    </refsect3>

<!-- 24-Oct-2011 -->
</refentry>