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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.
*/
/**
* The SharedResourceImplP component is used to wrap all of the operations
* from a dedicated resource so that access to them is protected when
* it is used as a shared resource. It uses the ArbiterInfo interface
* provided by an Arbiter to accomplish this.
*
* @author Kevin Klues (klueska@cs.wustl.edu)
* @version $Revision: 1.2 $
* @date $Date: 2010-06-29 22:07:40 $
*/
module SharedResourceImplP {
provides {
interface ResourceOperations as SharedResourceOperations[uint8_t id];
}
uses {
interface ArbiterInfo;
interface ResourceOperations;
}
}
implementation {
uint8_t current_id = 0xFF;
event void ResourceOperations.operationDone(error_t error) {
signal SharedResourceOperations.operationDone[current_id](error);
}
command error_t SharedResourceOperations.operation[uint8_t id]() {
if(call ArbiterInfo.userId() == id && call ResourceOperations.operation() == SUCCESS) {
current_id = id;
return SUCCESS;
}
return FAIL;
}
default event void SharedResourceOperations.operationDone[uint8_t id](error_t error) {}
}
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