124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
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/* ch_buff.h */
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/*
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* Copyright (c) 1997-2010, 2014-2015 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CH_BUFF_H
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#define CH_BUFF_H
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/**************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "microkernel/k_chstr.h" /* definition of all channel related data \
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structures */
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/* low-level parameters: */
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#define STORE_NBR_MARKERS
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/* NOTE: the number of pending write and read Xfers is always stored,
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as it is required for the channels to function properly. It is stored in the
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field ChBuff.iNbrPendingWrites and iNbrPendingReads.
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In the Writer and Reader MarkersList, the number of markers (==nbr. of
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unreleased Xfers)
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is monitored as well. They actually equal iNbrPendingWrites and
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iNbrPendingReads.
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Their existence depends on STORE_NBR_MARKERS. A reason to have them
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additionally is that
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some extra consistency checking is performed in the markers manipulation
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functionality
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itself.
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Drawback: double storage of nbr. of pending write Xfers (but for test
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purposes this is
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acceptable I think)
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*/
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/* exported functions:
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*/
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void BuffInit(unsigned char *pBuffer, int *piBuffSize, struct chbuff *pChBuff);
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void BuffReset(struct chbuff *pBuff);
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void BuffGetFreeSpaceTotal(struct chbuff *pBuff, int *piTotalFreeSpace);
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void BuffGetFreeSpace(struct chbuff *pBuff,
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int *piTotalFreeSpace,
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int *piFreeSpaceCont,
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int *piFreeSpaceAWA);
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void BuffGetAvailDataTotal(struct chbuff *pBuff, int *piAvailDataTotal);
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void BuffGetAvailData(struct chbuff *pBuff,
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int *piAvailDataTotal,
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int *piAvailDataCont,
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int *piAvailDataAWA);
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int BuffEnQ(struct chbuff *pBuff, int iSize, unsigned char **ppWrite);
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int BuffEnQA(struct chbuff *pBuff,
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int iSize,
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unsigned char **ppWrite,
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int *piTransferID);
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void BuffEnQA_End(struct chbuff *pBuff, int iTransferID, int iSize /*optional */);
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int BuffDeQ(struct chbuff *pBuff, int iSize, unsigned char **ppRead);
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int BuffDeQA(struct chbuff *pBuff,
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int iSize,
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unsigned char **ppRead,
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int *piTransferID);
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void BuffDeQA_End(struct chbuff *pBuff, int iTransferID, int iSize /*optional */);
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/* internal functions:
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*/
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void WriteMarkersClear(struct chbuff *pBuff);
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void ReadMarkersClear(struct chbuff *pBuff);
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int AsyncEnQRegstr(struct chbuff *pBuff, int iSize);
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int AsyncDeQRegstr(struct chbuff *pBuff, int iSize);
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void AsyncEnQFinished(struct chbuff *pBuff, int iTransferID);
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void AsyncDeQFinished(struct chbuff *pBuff, int iTransferID);
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int CalcAvailData(struct chbuff *pBuff, int *piDataAvailCont, int *piDataAvailAWA);
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int CalcFreeSpace(struct chbuff *pBuff, int *piFreeSpaceCont, int *piFreeSpaceAWA);
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void WriteMarkersClear(struct chbuff *pBuff);
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void ReadMarkersClear(struct chbuff *pBuff);
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int ScanMarkers(struct marker_list *pMarkerList,
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int *piSizeBWA,
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int *pisizeAWA,
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int *piNbrPendingXfers);
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int BuffFull(struct chbuff *pBuff);
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int BuffEmpty(struct chbuff *pBuff);
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void ChannelCheck4Intrusion(struct chbuff *pChBuff, unsigned char *pBegin, int iSize);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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/*****************************************/
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#endif
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