rzkdeletepartition.c

zilog的实时操作系统RZK,可以移植到多种处理器上

/*
* File				:	RZKDeletePartition
*
* Description		:	This file defines RZKDeletePartition API.
* 
* 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* This file contains unpublished confidential and proprietary information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 "ZMemory.h"
#include "ZInterrupt.h"

#define pPartition ((RZK_PARTITION_t *) hPartition)
extern RZK_THREADHANDLE_t hCurrentThread;

/** extern functions */
/* Function			:	RZKDeletePartition
*
* Description		:	This function deletes memory partition specified 
*						by the handle.
* 
* Inputs			:	hPartition - Specifies the handle to the partition
*						 that has to be deleted.
*							
* Outputs			:	RZKERR_SUCCESS-If the partition is deleted successfully.
*						RZKERR_INVALID_HANDLE-When the handle of the partition is invalid.
*						RZKERR_CB_BUSY-This specifies that the partition is 
*										exclusively used by other thread.
*							
*
* Dependencies		:	None.
*/
RZK_STATUS_t   RZKDeletePartition 
						( 
							 RZK_PARTITIONHANDLE_t hPartition
						)
{

	/* Local Variables */
//	UCHAR  cPreemptionMask ;
	RZK_STATE_t uState;

	/* Validate the handle passed */
#ifdef RZK_DEBUG
	if ((pPartition == NULL)|| (pPartition->uState == 0) ||
		(pPartition->magic_num != MAGIC_NUM_MEMORY))
			 return RZKERR_INVALID_HANDLE;
#endif

	/* Check for created bit set*/
#ifndef RZK_PERFORMANCE
	if (!(pPartition->uState &  OBJECT_CREATED ))
		return RZKERR_CB_BUSY;	
#endif

	/*Reset the created state of the memory partition control block*/
	uState = RZKDisablePreemption();
	pPartition->uState &= ( ~OBJECT_CREATED );
	
	
	/* If no memory block has been allocated, set the uState parameter to zero and return success */
	if(pPartition->uMemoryBlocksLeft == pPartition->uMemoryBlocks)
	{	
			pPartition->uState = 0;
			RZKRestorePreemption(uState);
			return RZKERR_SUCCESS;
	}
	
	/*If any of the memory control blocks are in use by any thread return error */
	else
	{
			pPartition->uState = OBJECT_BUSY | OBJECT_CREATED;
			RZKRestorePreemption(uState);
			return RZKERR_OBJECT_IN_USE;
	}   /* End of delete memory partition*/
}