roundrobinarbiterc.nc

tinyos-2.x.rar

/*
 * "Copyright (c) 2005 Washington University in St. Louis.
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 *
 * IN NO EVENT SHALL WASHINGTON UNIVERSITY IN ST. LOUIS BE LIABLE TO ANY PARTY 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
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/*
 * Copyright (c) 2004, Technische Universitat Berlin
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - Neither the name of the Technische Universitat Berlin nor the names
 *   of its contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
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*/

/*
 * - Revision -------------------------------------------------------------
 * $Revision: 1.6 $
 * $Date: 2007/04/15 20:39:48 $ 
 * ======================================================================== 
 */
 
/**
 * Please refer to TEP 108 for more information about this component and its
 * intended use.<br><br>
 *
 * This component provides the Resource, ArbiterInfo, and ResourceDefaultOwner
 * interfaces and uses the ResourceConfigure interface as
 * described in TEP 108.  It provides arbitration to a shared resource in
 * a Round Robin fashion.  An array is used to keep track of which users have 
 * put in requests for the resource.  Upon the release of the resource by one
 * of these users, the array is checked and the next user (in Round Robin order)
 * that has a pending request will ge granted control of the resource.  If
 * there are no pending requests, then the resource is granted to the default 
 * user.  If a new request is made, the default user will release the resource, 
 * and it will be granted to the requesting cleint.
 *
 * @param <b>resourceName</b> -- The name of the Resource being shared
 * 
 * @author Kevin Klues ([e-mail])
 */
 
generic configuration RoundRobinArbiterC(char resourceName[]) {
  provides {
    interface Resource[uint8_t id];
    interface ResourceRequested[uint8_t id];
    interface ResourceDefaultOwner;
    interface ArbiterInfo;
  }
  uses interface ResourceConfigure[uint8_t id];
}
implementation {
  components MainC;
  components new RoundRobinResourceQueueC(uniqueCount(resourceName)) as Queue;
  components new ArbiterP(uniqueCount(resourceName)) as Arbiter;

  MainC.SoftwareInit -> Queue;

  Resource = Arbiter;
  ResourceRequested = Arbiter;
  ResourceDefaultOwner = Arbiter;
  ArbiterInfo = Arbiter;
  ResourceConfigure = Arbiter;

  Arbiter.Queue -> Queue;
}