zremovefromresourcequeue.c

zilog的实时操作系统RZK,可以移植到多种处理器上

/*
* File				:	ZRemoveFromResourceQueue.c
*
* Description		:	This file contains definition of RemoveFromResourceQueue function.
*
* Copyright 2004 ZiLOG Inc.  ALL RIGHTS RESERVED.
*
* This file contains unpublished confidential and proprietary information
* of ZiLOG, Inc.
* NO PART OF THIS WORK MAY BE DUPLICATED, STORED, PUBLISHED OR DISCLOSED 
* IN ANY FORM WITHOUT THE PRIOR WRITTEN CONSENT OF ZiLOG, INC.
* This is not a license and no use of any kind of this work is authorized
* in the absence of a written license granted by ZiLOG, Inc. in ZiLOG's 
* sole discretion 
*/
#include "ZSysgen.h"
#include "ZTypes.h"
#include "ZThread.h"
#include "ZQueue.h"
#include "ZMessageQ.h"

#define pControlBlock ((RZK_MESSAGEQUEUE_t*) hControlBlock)
#define	pThreadToRemove ((RZK_TCB_t *) hThreadToRemove)

/* Function			:	RemoveFromResourceQueue
*
* Description		:	Removes a thread from the resource queue.
* 
* Inputs			:	hThread - handle to the thread to be removed.
*
* Outputs			:	None.
*
* Dependencies		:	None.
*/
void RemoveFromResourceQueue(RZK_HANDLE_t hControlBlock, RZK_THREADHANDLE_t hThreadToRemove)
{
	/* check if the thread is the only one in the queue */
	if(( pControlBlock->pResNext == pThreadToRemove ) && (pThreadToRemove->pResNext == NULL))
	{
		pControlBlock->pResNext = pControlBlock->pLastPosition = ( RZK_TCB_t * ) NULL;
		return;
	}
	/* If the thread being  removed is the first one in the queue */
	if(pThreadToRemove->pResPrevious == (RZK_TCB_t *) pControlBlock)
		pControlBlock->pResNext = pThreadToRemove->pResNext;
	else
		pThreadToRemove->pResPrevious->pResNext = pThreadToRemove->pResNext;
	
	/* If the node being removed is the last node */
	if(pThreadToRemove->pResNext == NULL)
	{
		pControlBlock->pLastPosition = pThreadToRemove->pResPrevious;
		return;
	}
	
	pThreadToRemove->pResNext->pResPrevious = pThreadToRemove->pResPrevious;
	
}  /* End of RemoveFromResourceQueue */