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<!ENTITY mediaSurfaceFormatsInc SYSTEM "mediaSurfaceFormatsInc.xml">
<!ENTITY accessMappedInc SYSTEM "accessMappedInc.xml">
<holder>The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
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<!-- ================================ SYNOPSIS -->
<refnamediv id="clEnqueueReleaseDX9MediaSurfacesKHR">
<refpurpose>Release OpenCL memory objects that have been created from media surfaces.</refpurpose>
<refsynopsisdiv xmlns:xlink=""><title></title>
<link xlink:href="scalarDataTypes.html">cl_int</link>
<paramdef><link xlink:href="abstractDataTypes.html">cl_command_queue</link>
<paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link>
<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>
const <link xlink:href="abstractDataTypes.html">cl_event</link>
<paramdef><link xlink:href="abstractDataTypes.html">cl_event</link><parameter>*event</parameter></paramdef>
<!-- ================================ PARAMETERS -->
<refsect1 id="parameters"><title>Parameters</title>
<varlistentry><!-- this param description is missing from the ext. spec p. 94, section -->
A valid command-queue.
The number of memory objects to be released in <varname>mem_objects</varname>.
A pointer to a list of OpenCL memory objects that were created from
media surfaces.
<term><varname>num_events_in_wait_list</varname>, <varname>event_wait_list</varname></term>
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.
<!-- ================================ NOTES -->
<refsect1 id="notes"><title>Notes</title>
Used to release OpenCL memory objects that have been created from media
surfaces. The media surfaces are released by the OpenCL context associated with
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.
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.
<!-- ================================ ERRORS -->
<refsect1 id="errors"><title>Errors</title>
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:
<itemizedlist mark="disc">
<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.
<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.
<errorname>CL_INVALID_COMMAND_QUEUE</errorname> if <varname>command_queue</varname> is not
a valid command-queue.
<errorname>CL_INVALID_CONTEXT</errorname> if context associated with
<varname>command_queue</varname> was not created from a media object.
<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
since the last time that they were acquired.
<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.
<errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
<!-- ================================ EXAMPLE -->
<refsect2 id="example1">
<informaltable frame="none">
<tgroup cols="1" align="left" colsep="0" rowsep="0">
<colspec colname="col1" colnum="1" />
Example goes here - it will be set in "code" type with white space preserved.
<!-- ================================ 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>
<!-- ================================ ALSO SEE -->
<refsect1 id="seealso"><title>Also see</title>
<!-- ============================== COPYRIGHT -->
<!-- Content included from -->
<refsect3 id="Copyright"><title></title>
<imagedata fileref="KhronosLogo.jpg" format="jpg" />
<para />
<!-- 24-Oct-2011 -->