<!-- Copyright (C) 2003 Red Hat, Inc. -->
|
<!-- Copyright (C) 2003 Red Hat, Inc. -->
|
<!-- This material may be distributed only subject to the terms -->
|
<!-- This material may be distributed only subject to the terms -->
|
<!-- and conditions set forth in the Open Publication License, v1.0 -->
|
<!-- and conditions set forth in the Open Publication License, v1.0 -->
|
<!-- or later (the latest version is presently available at -->
|
<!-- or later (the latest version is presently available at -->
|
<!-- http://www.opencontent.org/openpub/). -->
|
<!-- http://www.opencontent.org/openpub/). -->
|
<!-- Distribution of the work or derivative of the work in any -->
|
<!-- Distribution of the work or derivative of the work in any -->
|
<!-- standard (paper) book form is prohibited unless prior -->
|
<!-- standard (paper) book form is prohibited unless prior -->
|
<!-- permission is obtained from the copyright holder. -->
|
<!-- permission is obtained from the copyright holder. -->
|
<HTML
|
<HTML
|
><HEAD
|
><HEAD
|
><TITLE
|
><TITLE
|
>implements</TITLE
|
>implements</TITLE
|
><meta name="MSSmartTagsPreventParsing" content="TRUE">
|
><meta name="MSSmartTagsPreventParsing" content="TRUE">
|
<META
|
<META
|
NAME="GENERATOR"
|
NAME="GENERATOR"
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
|
"><LINK
|
"><LINK
|
REL="HOME"
|
REL="HOME"
|
TITLE="The eCos Component Writer's Guide"
|
TITLE="The eCos Component Writer's Guide"
|
HREF="cdl-guide.html"><LINK
|
HREF="cdl-guide.html"><LINK
|
REL="UP"
|
REL="UP"
|
TITLE="CDL Language Specification"
|
TITLE="CDL Language Specification"
|
HREF="reference.html"><LINK
|
HREF="reference.html"><LINK
|
REL="PREVIOUS"
|
REL="PREVIOUS"
|
TITLE="if_define"
|
TITLE="if_define"
|
HREF="ref.if-define.html"><LINK
|
HREF="ref.if-define.html"><LINK
|
REL="NEXT"
|
REL="NEXT"
|
TITLE="include_dir"
|
TITLE="include_dir"
|
HREF="ref.include-dir.html"></HEAD
|
HREF="ref.include-dir.html"></HEAD
|
><BODY
|
><BODY
|
CLASS="REFENTRY"
|
CLASS="REFENTRY"
|
BGCOLOR="#FFFFFF"
|
BGCOLOR="#FFFFFF"
|
TEXT="#000000"
|
TEXT="#000000"
|
LINK="#0000FF"
|
LINK="#0000FF"
|
VLINK="#840084"
|
VLINK="#840084"
|
ALINK="#0000FF"
|
ALINK="#0000FF"
|
><DIV
|
><DIV
|
CLASS="NAVHEADER"
|
CLASS="NAVHEADER"
|
><TABLE
|
><TABLE
|
SUMMARY="Header navigation table"
|
SUMMARY="Header navigation table"
|
WIDTH="100%"
|
WIDTH="100%"
|
BORDER="0"
|
BORDER="0"
|
CELLPADDING="0"
|
CELLPADDING="0"
|
CELLSPACING="0"
|
CELLSPACING="0"
|
><TR
|
><TR
|
><TH
|
><TH
|
COLSPAN="3"
|
COLSPAN="3"
|
ALIGN="center"
|
ALIGN="center"
|
>The <SPAN
|
>The <SPAN
|
CLASS="APPLICATION"
|
CLASS="APPLICATION"
|
>eCos</SPAN
|
>eCos</SPAN
|
> Component Writer's Guide</TH
|
> Component Writer's Guide</TH
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
WIDTH="10%"
|
WIDTH="10%"
|
ALIGN="left"
|
ALIGN="left"
|
VALIGN="bottom"
|
VALIGN="bottom"
|
><A
|
><A
|
HREF="ref.if-define.html"
|
HREF="ref.if-define.html"
|
ACCESSKEY="P"
|
ACCESSKEY="P"
|
>Prev</A
|
>Prev</A
|
></TD
|
></TD
|
><TD
|
><TD
|
WIDTH="80%"
|
WIDTH="80%"
|
ALIGN="center"
|
ALIGN="center"
|
VALIGN="bottom"
|
VALIGN="bottom"
|
></TD
|
></TD
|
><TD
|
><TD
|
WIDTH="10%"
|
WIDTH="10%"
|
ALIGN="right"
|
ALIGN="right"
|
VALIGN="bottom"
|
VALIGN="bottom"
|
><A
|
><A
|
HREF="ref.include-dir.html"
|
HREF="ref.include-dir.html"
|
ACCESSKEY="N"
|
ACCESSKEY="N"
|
>Next</A
|
>Next</A
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
><HR
|
><HR
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
WIDTH="100%"></DIV
|
WIDTH="100%"></DIV
|
><H1
|
><H1
|
><A
|
><A
|
NAME="REF.IMPLEMENTS"><SPAN
|
NAME="REF.IMPLEMENTS"><SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>implements</SPAN
|
>implements</SPAN
|
></H1
|
></H1
|
><DIV
|
><DIV
|
CLASS="REFNAMEDIV"
|
CLASS="REFNAMEDIV"
|
><A
|
><A
|
NAME="AEN4507"
|
NAME="AEN4507"
|
></A
|
></A
|
><H2
|
><H2
|
>Name</H2
|
>Name</H2
|
>Property <SPAN
|
>Property <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>implements</SPAN
|
>implements</SPAN
|
> -- Enabling this option provides one instance of a more
|
> -- Enabling this option provides one instance of a more
|
general interface.</DIV
|
general interface.</DIV
|
><DIV
|
><DIV
|
CLASS="REFSYNOPSISDIV"
|
CLASS="REFSYNOPSISDIV"
|
><A
|
><A
|
NAME="AEN4511"><H2
|
NAME="AEN4511"><H2
|
>Synopsis</H2
|
>Synopsis</H2
|
><TABLE
|
><TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="SYNOPSIS"
|
CLASS="SYNOPSIS"
|
>cdl_option <name> {
|
>cdl_option <name> {
|
implements <interface>
|
implements <interface>
|
…
|
…
|
}</PRE
|
}</PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="REFSECT1"
|
CLASS="REFSECT1"
|
><A
|
><A
|
NAME="AEN4513"
|
NAME="AEN4513"
|
></A
|
></A
|
><H2
|
><H2
|
>Description</H2
|
>Description</H2
|
><P
|
><P
|
>The <SPAN
|
>The <SPAN
|
CLASS="APPLICATION"
|
CLASS="APPLICATION"
|
>CDL</SPAN
|
>CDL</SPAN
|
> interface concept provides an abstraction mechanism that can
|
> interface concept provides an abstraction mechanism that can
|
be useful in many different circumstances. Essentially an interface is
|
be useful in many different circumstances. Essentially an interface is
|
a calculated option whose value is the number of active and enabled
|
a calculated option whose value is the number of active and enabled
|
options which implement that interface. For example the interface
|
options which implement that interface. For example the interface
|
<TT
|
<TT
|
CLASS="VARNAME"
|
CLASS="VARNAME"
|
>CYGINT_KERNEL_SCHEDULER</TT
|
>CYGINT_KERNEL_SCHEDULER</TT
|
> has a value corresponding
|
> has a value corresponding
|
to the number of schedulers in the system, typically just one.</P
|
to the number of schedulers in the system, typically just one.</P
|
><P
|
><P
|
>The <SPAN
|
>The <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>implements</SPAN
|
>implements</SPAN
|
> property takes a single argument, which should be the
|
> property takes a single argument, which should be the
|
name of an interface. This interface may be defined in the same
|
name of an interface. This interface may be defined in the same
|
package as the implementor or in some other package. In the latter
|
package as the implementor or in some other package. In the latter
|
case it may sometimes be appropriate for the implementor or the
|
case it may sometimes be appropriate for the implementor or the
|
implementor's package to have a <SPAN
|
implementor's package to have a <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>requires</SPAN
|
>requires</SPAN
|
> property for the package
|
> property for the package
|
containing the interface. An option may contain multiple <SPAN
|
containing the interface. An option may contain multiple <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>implements</SPAN
|
>implements</SPAN
|
>
|
>
|
properties. It is possible for an option to implement a given
|
properties. It is possible for an option to implement a given
|
interface multiple times, and on occasion this is actually useful.</P
|
interface multiple times, and on occasion this is actually useful.</P
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="REFSECT1"
|
CLASS="REFSECT1"
|
><A
|
><A
|
NAME="AEN4522"
|
NAME="AEN4522"
|
></A
|
></A
|
><H2
|
><H2
|
>Example</H2
|
>Example</H2
|
><TABLE
|
><TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="PROGRAMLISTING"
|
CLASS="PROGRAMLISTING"
|
>cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE {
|
>cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE {
|
display "Multi-level queue scheduler"
|
display "Multi-level queue scheduler"
|
default_value 1
|
default_value 1
|
implements CYGINT_KERNEL_SCHEDULER
|
implements CYGINT_KERNEL_SCHEDULER
|
…
|
…
|
}</PRE
|
}</PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="REFSECT1"
|
CLASS="REFSECT1"
|
><A
|
><A
|
NAME="AEN4525"
|
NAME="AEN4525"
|
></A
|
></A
|
><H2
|
><H2
|
>See Also</H2
|
>See Also</H2
|
><P
|
><P
|
>Command <A
|
>Command <A
|
HREF="ref.cdl-interface.html"
|
HREF="ref.cdl-interface.html"
|
><TT
|
><TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>cdl_interface</TT
|
>cdl_interface</TT
|
></A
|
></A
|
>.</P
|
>.</P
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="NAVFOOTER"
|
CLASS="NAVFOOTER"
|
><HR
|
><HR
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
WIDTH="100%"><TABLE
|
WIDTH="100%"><TABLE
|
SUMMARY="Footer navigation table"
|
SUMMARY="Footer navigation table"
|
WIDTH="100%"
|
WIDTH="100%"
|
BORDER="0"
|
BORDER="0"
|
CELLPADDING="0"
|
CELLPADDING="0"
|
CELLSPACING="0"
|
CELLSPACING="0"
|
><TR
|
><TR
|
><TD
|
><TD
|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="left"
|
ALIGN="left"
|
VALIGN="top"
|
VALIGN="top"
|
><A
|
><A
|
HREF="ref.if-define.html"
|
HREF="ref.if-define.html"
|
ACCESSKEY="P"
|
ACCESSKEY="P"
|
>Prev</A
|
>Prev</A
|
></TD
|
></TD
|
><TD
|
><TD
|
WIDTH="34%"
|
WIDTH="34%"
|
ALIGN="center"
|
ALIGN="center"
|
VALIGN="top"
|
VALIGN="top"
|
><A
|
><A
|
HREF="cdl-guide.html"
|
HREF="cdl-guide.html"
|
ACCESSKEY="H"
|
ACCESSKEY="H"
|
>Home</A
|
>Home</A
|
></TD
|
></TD
|
><TD
|
><TD
|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="right"
|
ALIGN="right"
|
VALIGN="top"
|
VALIGN="top"
|
><A
|
><A
|
HREF="ref.include-dir.html"
|
HREF="ref.include-dir.html"
|
ACCESSKEY="N"
|
ACCESSKEY="N"
|
>Next</A
|
>Next</A
|
></TD
|
></TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="left"
|
ALIGN="left"
|
VALIGN="top"
|
VALIGN="top"
|
><SPAN
|
><SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>if_define</SPAN
|
>if_define</SPAN
|
></TD
|
></TD
|
><TD
|
><TD
|
WIDTH="34%"
|
WIDTH="34%"
|
ALIGN="center"
|
ALIGN="center"
|
VALIGN="top"
|
VALIGN="top"
|
><A
|
><A
|
HREF="reference.html"
|
HREF="reference.html"
|
ACCESSKEY="U"
|
ACCESSKEY="U"
|
>Up</A
|
>Up</A
|
></TD
|
></TD
|
><TD
|
><TD
|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="right"
|
ALIGN="right"
|
VALIGN="top"
|
VALIGN="top"
|
><SPAN
|
><SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>include_dir</SPAN
|
>include_dir</SPAN
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
></DIV
|
></DIV
|
></BODY
|
></BODY
|
></HTML
|
></HTML
|
|
|
