sdk/1.0/docs/man/clRetainContext.xml

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<refentry>
    <refentryinfo>
        <keywordset>
            <keyword>         
                clRetainContext
            </keyword>
        </keywordset>
    </refentryinfo>

    <refmeta>
        <refentrytitle>       
            clRetainContext
        </refentrytitle>

        <refmiscinfo>
            <copyright>
                <year>2007-2009</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>2</manvolnum>
  
    </refmeta>


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

    <refnamediv id="clGetDeviceIDs">
        <refname>             
            clRetainContext
        </refname> 

        <refpurpose>          
            Increment the context reference count.
        </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>
                        clRetainContext
                    </function>
                </funcdef>

                <paramdef><link xlink:href="abstractDataTypes.html">cl_context</link><parameter>context</parameter></paramdef>   

            </funcprototype>
        </funcsynopsis>     
    </refsynopsisdiv>


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

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

            <varlistentry>
                <term>
                    <varname> <!-- parameter name -->
                        context
                    </varname>
                </term>

                <listitem>
                    <para> <!-- parameter description -->
                        The context to retain.
                    </para>
               </listitem>
            </varlistentry>
        </variablelist>
    </refsect1>

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

    <refsect1 id="notes"><title>Notes</title>
        <para>
            <citerefentry><refentrytitle>clCreateContext</refentrytitle></citerefentry> and
<citerefentry><refentrytitle>clCreateContextFromType</refentrytitle></citerefentry> perform an implicit retain. This is very
helpful for 3rd party libraries, which typically get a context passed to them by the application.
However, it is possible that the application may delete the context without informing the library.
Allowing functions to attach to (i.e. retain) and release a context solves the problem of a context
being used by a library no longer being valid.
        </para>
    </refsect1>
    

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

    <refsect1 id="errors"><title>Errors</title>
        <para>
            Returns <errorname>CL_SUCCESS</errorname> if the function is executed successfully, or  <errorname>CL_INVALID_CONTEXT</errorname> if <varname>context</varname> is not a valid OpenCL context.
        </para>
    </refsect1>
    

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

        <informaltable frame="none">
            <tgroup cols="1" align="left" colsep="0" rowsep="0">
                <colspec colname="col1" colnum="1" />
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                        </entry>
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<!-- ================================ SPECIFICATION  -->        
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    <refsect1 id="specification"><title>Specification</title>
        <para>
            <imageobject>
                <imagedata fileref="pdficon_small1.gif" format="gif" />
            </imageobject>

            <olink uri="clRetainContext">OpenCL Specification</olink>
        </para>
    </refsect1>     


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

    <refsect1 id="seealso"><title>Also see</title>
        <para>
<citerefentry><refentrytitle>clCreateContext</refentrytitle></citerefentry>, 
<citerefentry><refentrytitle>clCreateContextFromType</refentrytitle></citerefentry>,  <citerefentry><refentrytitle>clGetContextInfo</refentrytitle></citerefentry>,  <citerefentry><refentrytitle>clReleaseContext</refentrytitle></citerefentry>, 	
<citerefentry><refentrytitle>clGetContextInfo</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>

</refentry>