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/*
* Copyright (c) 2006 Washington University in St. Louis.
* 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 copyright holders nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Timer.h"
/**
*
* This application is used to test the use of Shared Resources.
* Three Resource users are created and all three request
* control of the resource before any one of them is granted it.
* Once the first user is granted control of the resource, it performs
* some operation on it. Once this operation has completed, a timer
* is set to allow this user to have control of it for a specific
* amount of time. Once this timer expires, the resource is released
* and then immediately requested again. Upon releasing the resource
* control will be granted to the next user that has requested it in
* round robin order. Initial requests are made by the three resource
* users in the following order.<br>
* <li> Resource 0
* <li> Resource 2
* <li> Resource 1
* <br>
* It is expected then that using a round robin policy, control of the
* resource will be granted in the order of 0,1,2 and the Leds
* corresponding to each resource will flash whenever this occurs.<br>
* <li> Led 0 -> Resource 0
* <li> Led 1 -> Resource 1
* <li> Led 2 -> Resource 2
* <br>
*
* @author Kevin Klues (klueska@cs.wustl.edu)
* @version $Revision: 1.2 $
* @date $Date: 2010-06-29 22:07:40 $
*/
module SharedResourceDemoC {
uses {
interface Boot;
interface Leds;
interface Timer<TMilli> as Timer0;
interface Timer<TMilli> as Timer1;
interface Timer<TMilli> as Timer2;
interface Resource as Resource0;
interface ResourceOperations as ResourceOperations0;
interface Resource as Resource1;
interface ResourceOperations as ResourceOperations1;
interface Resource as Resource2;
interface ResourceOperations as ResourceOperations2;
}
}
implementation {
#define HOLD_PERIOD 250
//All resources try to gain access
event void Boot.booted() {
call Resource0.request();
call Resource2.request();
call Resource1.request();
}
//If granted the resource, run some operation
event void Resource0.granted() {
call ResourceOperations0.operation();
}
event void Resource1.granted() {
call ResourceOperations1.operation();
}
event void Resource2.granted() {
call ResourceOperations2.operation();
}
//When the operation completes, flash the LED and hold the resource for a while
event void ResourceOperations0.operationDone(error_t error) {
call Timer0.startOneShot(HOLD_PERIOD);
call Leds.led0Toggle();
}
event void ResourceOperations1.operationDone(error_t error) {
call Timer1.startOneShot(HOLD_PERIOD);
call Leds.led1Toggle();
}
event void ResourceOperations2.operationDone(error_t error) {
call Timer2.startOneShot(HOLD_PERIOD);
call Leds.led2Toggle();
}
//After the hold period release the resource and request it again
event void Timer0.fired() {
call Resource0.release();
call Resource0.request();
}
event void Timer1.fired() {
call Resource1.release();
call Resource1.request();
}
event void Timer2.fired() {
call Resource2.release();
call Resource2.request();
}
}
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