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>implements</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4507"
></A
><H2
>Name</H2
>Property <SPAN
CLASS="PROPERTY"
>implements</SPAN
>&nbsp;--&nbsp;Enabling this option provides one instance of a more
general interface.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN4511"><H2
>Synopsis</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_option &lt;name&gt; {
    implements &lt;interface&gt;
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4513"
></A
><H2
>Description</H2
><P
>The <SPAN
CLASS="APPLICATION"
>CDL</SPAN
> interface concept provides an abstraction mechanism that can
be useful in many different circumstances. Essentially an interface is
a calculated option whose value is the number of active and enabled
options which implement that interface. For example the interface
<TT
CLASS="VARNAME"
>CYGINT_KERNEL_SCHEDULER</TT
> has a value corresponding
to the number of schedulers in the system, typically just one.</P
><P
>The <SPAN
CLASS="PROPERTY"
>implements</SPAN
> property takes a single argument, which should be the
name of an interface. This interface may be defined in the same
package as the implementor or in some other package. In the latter
case it may sometimes be appropriate for the implementor or the
implementor's package to have a <SPAN
CLASS="PROPERTY"
>requires</SPAN
> property for the package
containing the interface. An option may contain multiple <SPAN
CLASS="PROPERTY"
>implements</SPAN
>
properties. It is possible for an option to implement a given
interface multiple times, and on occasion this is actually useful.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4522"
></A
><H2
>Example</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE {
    display       "Multi-level queue scheduler"
    default_value 1
    implements    CYGINT_KERNEL_SCHEDULER
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4525"
></A
><H2
>See Also</H2
><P
>Command <A
HREF="ref.cdl-interface.html"
><TT
CLASS="LITERAL"
>cdl_interface</TT
></A
>.</P
></DIV
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>

Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>implements</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="The eCos Component Writer's Guide"`
20			`HREF="cdl-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="CDL Language Specification"`
23			`HREF="reference.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="if_define"`
26			`HREF="ref.if-define.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="include_dir"`
29			`HREF="ref.include-dir.html"></HEAD`
30			`><BODY`
31			`CLASS="REFENTRY"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
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36			`ALINK="#0000FF"`
37			`><DIV`
38			`CLASS="NAVHEADER"`
39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
42			`BORDER="0"`
43			`CELLPADDING="0"`
44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>The <SPAN`
50			`CLASS="APPLICATION"`
51			`>eCos</SPAN`
52			`> Component Writer's Guide</TH`
53			`></TR`
54			`><TR`
55			`><TD`
56			`WIDTH="10%"`
57			`ALIGN="left"`
58			`VALIGN="bottom"`
59			`><A`
60			`HREF="ref.if-define.html"`
61			`ACCESSKEY="P"`
62			`>Prev</A`
63			`></TD`
64			`><TD`
65			`WIDTH="80%"`
66			`ALIGN="center"`
67			`VALIGN="bottom"`
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69			`><TD`
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71			`ALIGN="right"`
72			`VALIGN="bottom"`
73			`><A`
74			`HREF="ref.include-dir.html"`
75			`ACCESSKEY="N"`
76			`>Next</A`
77			`></TD`
78			`></TR`
79			`></TABLE`
80			`><HR`
81			`ALIGN="LEFT"`
82			`WIDTH="100%"></DIV`
83			`><H1`
84			`><A`
85			`NAME="REF.IMPLEMENTS"><SPAN`
86			`CLASS="PROPERTY"`
87			`>implements</SPAN`
88			`></H1`
89			`><DIV`
90			`CLASS="REFNAMEDIV"`
91			`><A`
92			`NAME="AEN4507"`
93			`></A`
94			`><H2`
95			`>Name</H2`
96			`>Property <SPAN`
97			`CLASS="PROPERTY"`
98			`>implements</SPAN`
99			`> -- Enabling this option provides one instance of a more`
100			`general interface.</DIV`
101			`><DIV`
102			`CLASS="REFSYNOPSISDIV"`
103			`><A`
104			`NAME="AEN4511"><H2`
105			`>Synopsis</H2`
106			`><TABLE`
107			`BORDER="5"`
108			`BGCOLOR="#E0E0F0"`
109			`WIDTH="70%"`
110			`><TR`
111			`><TD`
112			`><PRE`
113			`CLASS="SYNOPSIS"`
114			`>cdl_option <name> {`
115			`implements <interface>`
116			`…`
117			`}</PRE`
118			`></TD`
119			`></TR`
120			`></TABLE`
121			`></DIV`
122			`><DIV`
123			`CLASS="REFSECT1"`
124			`><A`
125			`NAME="AEN4513"`
126			`></A`
127			`><H2`
128			`>Description</H2`
129			`><P`
130			`>The <SPAN`
131			`CLASS="APPLICATION"`
132			`>CDL</SPAN`
133			`> interface concept provides an abstraction mechanism that can`
134			`be useful in many different circumstances. Essentially an interface is`
135			`a calculated option whose value is the number of active and enabled`
136			`options which implement that interface. For example the interface`
137			`<TT`
138			`CLASS="VARNAME"`
139			`>CYGINT_KERNEL_SCHEDULER</TT`
140			`> has a value corresponding`
141			`to the number of schedulers in the system, typically just one.</P`
142			`><P`
143			`>The <SPAN`
144			`CLASS="PROPERTY"`
145			`>implements</SPAN`
146			`> property takes a single argument, which should be the`
147			`name of an interface. This interface may be defined in the same`
148			`package as the implementor or in some other package. In the latter`
149			`case it may sometimes be appropriate for the implementor or the`
150			`implementor's package to have a <SPAN`
151			`CLASS="PROPERTY"`
152			`>requires</SPAN`
153			`> property for the package`
154			`containing the interface. An option may contain multiple <SPAN`
155			`CLASS="PROPERTY"`
156			`>implements</SPAN`
157			`>`
158			`properties. It is possible for an option to implement a given`
159			`interface multiple times, and on occasion this is actually useful.</P`
160			`></DIV`
161			`><DIV`
162			`CLASS="REFSECT1"`
163			`><A`
164			`NAME="AEN4522"`
165			`></A`
166			`><H2`
167			`>Example</H2`
168			`><TABLE`
169			`BORDER="5"`
170			`BGCOLOR="#E0E0F0"`
171			`WIDTH="70%"`
172			`><TR`
173			`><TD`
174			`><PRE`
175			`CLASS="PROGRAMLISTING"`
176			`>cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE {`
177			`display "Multi-level queue scheduler"`
178			`default_value 1`
179			`implements CYGINT_KERNEL_SCHEDULER`
180			`…`
181			`}</PRE`
182			`></TD`
183			`></TR`
184			`></TABLE`
185			`></DIV`
186			`><DIV`
187			`CLASS="REFSECT1"`
188			`><A`
189			`NAME="AEN4525"`
190			`></A`
191			`><H2`
192			`>See Also</H2`
193			`><P`
194			`>Command <A`
195			`HREF="ref.cdl-interface.html"`
196			`><TT`
197			`CLASS="LITERAL"`
198			`>cdl_interface</TT`
199			`></A`
200			`>.</P`
201			`></DIV`
202			`><DIV`
203			`CLASS="NAVFOOTER"`
204			`><HR`
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212			`><TR`
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214			`WIDTH="33%"`
215			`ALIGN="left"`
216			`VALIGN="top"`
217			`><A`
218			`HREF="ref.if-define.html"`
219			`ACCESSKEY="P"`
220			`>Prev</A`
221			`></TD`
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243			`WIDTH="33%"`
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246			`><SPAN`
247			`CLASS="PROPERTY"`
248			`>if_define</SPAN`
249			`></TD`
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251			`WIDTH="34%"`
252			`ALIGN="center"`
253			`VALIGN="top"`
254			`><A`
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256			`ACCESSKEY="U"`
257			`>Up</A`
258			`></TD`
259			`><TD`
260			`WIDTH="33%"`
261			`ALIGN="right"`
262			`VALIGN="top"`
263			`><SPAN`
264			`CLASS="PROPERTY"`
265			`>include_dir</SPAN`
266			`></TD`
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272			`>`

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