asyncpowermanagerp.nc

tinyos-2.x.rar

/*
 * "Copyright (c) 2005 Washington University in St. Louis.
 * All rights reserved.
 *
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 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
 *
 * IN NO EVENT SHALL WASHINGTON UNIVERSITY IN ST. LOUIS BE LIABLE TO ANY PARTY 
 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING 
 * OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF WASHINGTON 
 * UNIVERSITY IN ST. LOUIS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * WASHINGTON UNIVERSITY IN ST. LOUIS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
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 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
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/*
 * - Revision -------------------------------------------------------------
 * $Revision: 1.6 $
 * $Date: 2008/06/26 04:39:08 $ 
 * ======================================================================== 
 */
 
/**
 * Please refer to TEP 115 for more information about this component and its
 * intended use.<br><br>
 *
 * This is the internal implementation of the standard power management
 * policy for managing the power states of non-virtualized devices.
 * Non-virtualized devices are shared using a parameterized Resource
 * interface, and are powered down according to some policy whenever there
 * are no more pending requests to that Resource.  The policy implemented
 * by this component is to power down a device as soon as it becomes free.
 * Such a policy is useful whenever a device has a negligible wake-up
 * latency.  There is no cost associated with waiting for the device to
 * power up, so it can be powered on and off as often as possible.
 * 
 * @author Kevin Klues ([e-mail])
 */
 
generic module AsyncPowerManagerP() @safe() {
  uses {
    interface AsyncStdControl;

    interface PowerDownCleanup;
    interface ResourceDefaultOwner;
    interface ArbiterInfo;
  }
}
implementation {

  async event void ResourceDefaultOwner.requested() {
    call AsyncStdControl.start();
    call ResourceDefaultOwner.release(); 
  }

  async event void ResourceDefaultOwner.immediateRequested() {
    call AsyncStdControl.start();
    call ResourceDefaultOwner.release();
  } 

  async event void ResourceDefaultOwner.granted() {
    call PowerDownCleanup.cleanup();
    call AsyncStdControl.stop();
  }

  default async command void PowerDownCleanup.cleanup() {
  }
}