121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/* K_Ch_RO.c */
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/*
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* Copyright (c) 1997-2014 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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/* includes */
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#include <microkernel.h>
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#include <kchan.h>
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#include <kmemcpy.h>
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#include <minik.h>
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#include <kticks.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <misc/__assert.h>
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/*******************************************************************************
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*
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* K_ChProcRO - read from the channel
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*
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* This routine reads from the channel. If <pPipe> is NULL, then it uses
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* <pNewReader> as the reader. Otherwise it takes the reader from the channel
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* structure.
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*
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* RETURNS: N/A
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*/
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void K_ChProcRO(struct pipe_struct *pPipe, struct k_args *pNewReader)
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{
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struct k_args *pReader;
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struct k_chproc *pReaderArgs;
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unsigned char *pRead;
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int iSize;
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int id;
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int ret;
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int numIterations = 2;
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pReader = (pNewReader != NULL) ? pNewReader : pPipe->Readers;
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__ASSERT_NO_MSG((pPipe->Readers == pNewReader) ||
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(NULL == pPipe->Readers) || (NULL == pNewReader));
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pReaderArgs = &pReader->Args.ChProc;
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do {
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iSize = min(
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pPipe->Buff.iAvailDataCont,
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pReaderArgs->iSizeTotal - pReaderArgs->iSizeXferred);
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if (iSize == 0) {
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return;
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}
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struct k_args *Moved_req;
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ret = BuffDeQA(&pPipe->Buff, iSize, &pRead, &id);
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if (0 == ret) {
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return;
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}
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GETARGS(Moved_req);
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setup_movedata(
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Moved_req,
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pPipe,
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XFER_B2R,
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NULL,
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pReader,
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pReaderArgs->DataNode,
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(char *)(pReaderArgs->pData) +
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OCTET_TO_SIZEOFUNIT(pReaderArgs->iSizeXferred),
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K_ThisNode,
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pRead,
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ret,
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id);
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K_mvdreq(Moved_req);
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FREEARGS(Moved_req);
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pReaderArgs->iNbrPendXfers++;
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pReaderArgs->iSizeXferred += ret;
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if (pReaderArgs->iSizeXferred == pReaderArgs->iSizeTotal) {
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ChReqSetStatus(pReaderArgs, TERM_SATISFIED);
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if (pReader->Head != NULL) {
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DeListWaiter(pReader);
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myfreetimer(&pReader->Time.timer);
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}
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return;
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} else
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ChReqSetStatus(pReaderArgs, XFER_BUSY);
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} while (--numIterations != 0);
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}
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