implementation {
   components new RoundRobinArbiterC(UQ_SHARED_RESOURCE) as Arbiter;
   components new SplitControlPowerManagerC() as PowerManager;
   components ResourceP;
   components SharedResourceImplP;
 
   ResourceOperations = SharedResourceImplP;
   Resource = Arbiter;
   ResourceRequested = Arbiter;
   ResourceConfigure = Arbiter;
   SharedResourceImplP.ArbiterInfo -> Arbiter;
   PowerManager.ResourceDefaultOwner -> Arbiter;
   
   PowerManager.SplitControl -> ResourceP;
   SharedResourceImplP.ResourceOperations -> ResourceP;
 }
 
</PRE>
<P>Four different components are instantiated by this configuration: </P><PRE>components new RoundRobinArbiterC(UQ_SHARED_RESOURCE) as Arbiter;
components new SplitControlPowerManagerC() as PowerManager;
components ResourceP;
components SharedResourceImplP;
</PRE>
<P>As we've already seen, the <TT>RoundRobinArbiterC</TT> component is used to 
provide arbitration between clients using <TT>SharedResourceC</TT>. The 
<TT>SplitControlPowerManagerC</TT> component is used to perform automatic power 
management of the resource to turn it on whenever a new client requests its use 
and shut it down whenever it goes idle. The <TT>ResourceP</TT> component is the 
implementation of a dedicated resource which provides a <TT>SplitControl</TT> 
interface and a <TT>ResourceOperations</TT> interface. This dedicated resource 
is wrapped by the <TT>SharedResourceImplP</TT> component in order to provide 
protected shared access to it. <TT>SharedResourceImplP</TT> wraps all the 
commands provided by the dedicated resource, and uses the <TT>ArbiterInfo</TT> 
interface to keep clients from calling them without first being granted access 
to the resource. </P>
<P>If you would like to see more examples of how to use the different arbiters 
and power managers provided in the default TinyOS distribution, please refer to 
the test applications located in <TT>tinyos-2.x/apps/tests/TestArbiter</TT> and 
<TT>tinyos-2.x/apps/tests/TestPowerManager</TT>. This tutorial has provided 
enough background information on how to use these components in order for you to 
sift through these applications on your own. </P><A name=Conclusion></A>
<H1><SPAN class=mw-headline>Conclusion</SPAN></H1>
<P>This tutorial has given an overview of how resource arbitration and 
mechanisms for performing power management on those resources is provided in 
TinyOS. It walked us through the steps necessary for: </P>
<OL>
  <LI>Wiring in a shared resource for use by a client. 
  <LI>Using the <TT>Resource</TT> interface to gain access to a shared resource. 

  <LI>Changing the arbitration policy used by a particular shared resource. 
  <LI>Wrapping a dedicated resource and wiring in a power manager in order to 
  create a shared resource. </LI></OL>
<P>While the power managers presented in this tutorial are powerful components 
for providing power management of shared resources, they are not the only power 
management mechanisms provided by TinyOS. Microcontroller power management is 
also preformed as outlined in TEP115. Whenever the task queue empties, the 
lowest power state that the microcontroller is capable of dropping to is 
automatically calculated and then switched to. In this way, the user is not 
burdened with explicity controlling these power states. The cc1000 and cc2420 
radio implementations also provide "Low Power Listening" (LPL) interfaces for 
controlling their duty cycles. The LPL implementation for the cc2420 can be 
found under <TT>tinyos-2.x/tos/chips/cc2420</TT> and the LPL implementation for 
the cc1000 can be found under <TT>tinyos-2.x/tos/chips/cc1000</TT>. Take a look 
at <A title="Writing Low-Power Applications" 
href="http://docs.tinyos.net/index.php/Writing_Low-Power_Applications">lesson 
16</A> to see how this interface is used. </P><A name=Related_Documentation></A>
<H1><SPAN class=mw-headline>Related Documentation</SPAN></H1>
<UL>
  <LI><A class="external text" 
  title=http://csl.stanford.edu/~pal/pubs/tinyos-programming-1-0.pdf 
  href="http://csl.stanford.edu/~pal/pubs/tinyos-programming-1-0.pdf" 
  rel=nofollow>TinyOS Programming Guide <I>Sections 6.2 and 7.4</I></A> 
  <LI><A class="external text" 
  title=http://www.tinyos.net/tinyos-2.x/doc/html/tep108.html 
  href="http://www.tinyos.net/tinyos-2.x/doc/html/tep108.html" rel=nofollow>TEP 
  108: Resource Arbitration</A> 
  <LI><A class="external text" 
  title=http://www.tinyos.net/tinyos-2.x/doc/html/tep112.html 
  href="http://www.tinyos.net/tinyos-2.x/doc/html/tep112.html" rel=nofollow>TEP 
  112: Microcontroller Power Management</A> 
  <LI><A class="external text" 
  title=http://www.tinyos.net/tinyos-2.x/doc/html/tep115.html 
  href="http://www.tinyos.net/tinyos-2.x/doc/html/tep115.html" rel=nofollow>TEP 
  115: Power Management of Non-Virtualized Devices</A> </LI></UL>
<HR>

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