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Diffstat (limited to 'drivers/staging/epl/SharedBuff.c')
| -rw-r--r-- | drivers/staging/epl/SharedBuff.c | 1799 |
1 files changed, 1799 insertions, 0 deletions
diff --git a/drivers/staging/epl/SharedBuff.c b/drivers/staging/epl/SharedBuff.c new file mode 100644 index 00000000000..9fb09d6bc28 --- /dev/null +++ b/drivers/staging/epl/SharedBuff.c @@ -0,0 +1,1799 @@ +/**************************************************************************** + + (c) SYSTEC electronic GmbH, D-07973 Greiz, August-Bebel-Str. 29 + www.systec-electronic.com + + Project: Project independend shared buffer (linear + circular) + + Description: Implementation of platform independend part for the + shared buffer + + License: + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + 2. 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. + + 3. Neither the name of SYSTEC electronic GmbH nor the names of its + contributors may be used to endorse or promote products derived + from this software without prior written permission. For written + permission, please contact info@systec-electronic.com. + + 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 HOLDERS 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. + + Severability Clause: + + If a provision of this License is or becomes illegal, invalid or + unenforceable in any jurisdiction, that shall not affect: + 1. the validity or enforceability in that jurisdiction of any other + provision of this License; or + 2. the validity or enforceability in other jurisdictions of that or + any other provision of this License. + + ------------------------------------------------------------------------- + + 2006/06/27 -rs: V 1.00 (initial version) + +****************************************************************************/ + +#if defined(WIN32) || defined(_WIN32) + +#ifdef UNDER_RTSS + // RTX header +#include <windows.h> +#include <process.h> +#include <rtapi.h> + +#elif __BORLANDC__ + // borland C header +#include <windows.h> +#include <process.h> + +#elif WINCE +#include <windows.h> + +#else + // MSVC needs to include windows.h at first + // the following defines ar necessary for function prototypes for waitable timers +#define _WIN32_WINDOWS 0x0401 +#define _WIN32_WINNT 0x0400 +#include <windows.h> +#include <process.h> +#endif + +#endif + +#include "global.h" +#include "SharedBuff.h" +#include "ShbIpc.h" + +// d.k. Linux kernel modules needs other header files for memcpy() +#if (TARGET_SYSTEM == _LINUX_) && defined(__KERNEL__) +#include <linux/string.h> +#else +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#endif + +/***************************************************************************/ +/* */ +/* */ +/* G L O B A L D E F I N I T I O N S */ +/* */ +/* */ +/***************************************************************************/ + +#if (!defined(SHAREDBUFF_INLINED)) || defined(INLINE_ENABLED) + +//--------------------------------------------------------------------------- +// Configuration +//--------------------------------------------------------------------------- + +//--------------------------------------------------------------------------- +// Constant definitions +//--------------------------------------------------------------------------- + +#define SBC_MAGIC_ID 0x53424323 // magic ID ("SBC#") +#define SBL_MAGIC_ID 0x53424C23 // magic ID ("SBL#") + +//--------------------------------------------------------------------------- +// Local types +//--------------------------------------------------------------------------- + +// structure to administrate circular shared buffer head +typedef struct { + unsigned long m_ShbCirMagicID; // magic ID ("SBC#") + unsigned long m_ulBufferTotalSize; // over-all size of complete buffer + unsigned long m_ulBufferDataSize; // size of complete data area + unsigned long m_ulWrIndex; // current write index (set bevore write) + unsigned long m_ulRdIndex; // current read index (set after read) + unsigned long m_ulNumOfWriteJobs; // number of currently (parallel running) write operations + unsigned long m_ulDataInUse; // currently used buffer size (incl. uncompleted write operations) + unsigned long m_ulDataApended; // buffer size of complete new written but not yet readable data (in case of m_ulNumOfWriteJobs>1) + unsigned long m_ulBlocksApended; // number of complete new written but not yet readable data blocks (in case of m_ulNumOfWriteJobs>1) + unsigned long m_ulDataReadable; // buffer size with readable (complete written) data + unsigned long m_ulBlocksReadable; // number of readable (complete written) data blocks + tShbCirSigHndlrNewData m_pfnSigHndlrNewData; // application handler to signal new data + unsigned int m_fBufferLocked; // TRUE if buffer is locked (because of pending reset request) + tShbCirSigHndlrReset m_pfnSigHndlrReset; // application handler to signal buffer reset is done + unsigned char m_Data; // start of data area (the real data size is unknown at this time) + +} tShbCirBuff; + +// structure to administrate linear shared buffer head +typedef struct { + unsigned int m_ShbLinMagicID; // magic ID ("SBL#") + unsigned long m_ulBufferTotalSize; // over-all size of complete buffer + unsigned long m_ulBufferDataSize; // size of complete data area + unsigned char m_Data; // start of data area (the real data size is unknown at this time) + +} tShbLinBuff; + +// type to save size of a single data block inside the circular shared buffer +typedef struct { + unsigned int m_uiFullBlockSize:28; // a single block must not exceed a length of 256MByte :-) + unsigned int m_uiAlignFillBytes:4; + +} tShbCirBlockSize; + +#define SBC_BLOCK_ALIGNMENT 4 // alignment must *not* be lower than sizeof(tShbCirBlockSize)! +#define SBC_MAX_BLOCK_SIZE ((1<<28)-1) // = (2^28 - 1) = (256MByte - 1) -> should be enought for real life :-) + +#define SBL_BLOCK_ALIGNMENT 4 +#define SBL_MAX_BLOCK_SIZE ((1<<28)-1) // = (2^28 - 1) = (256MByte - 1) -> should be enought for real life :-) + +//--------------------------------------------------------------------------- +// Global variables +//--------------------------------------------------------------------------- + +//--------------------------------------------------------------------------- +// Local variables +//--------------------------------------------------------------------------- + +//--------------------------------------------------------------------------- +// Prototypes of internal functions +//--------------------------------------------------------------------------- + +//--------------------------------------------------------------------------- +// Get pointer to Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbCirBuff *ShbCirGetBuffer(tShbInstance pShbInstance_p) +{ + + tShbCirBuff *pShbCirBuff; + + pShbCirBuff = (tShbCirBuff *) ShbIpcGetShMemPtr(pShbInstance_p); + ASSERT(pShbCirBuff->m_ShbCirMagicID == SBC_MAGIC_ID); + + return (pShbCirBuff); + +} + +//--------------------------------------------------------------------------- +// Get pointer to Linear Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbLinBuff *ShbLinGetBuffer(tShbInstance pShbInstance_p) +{ + + tShbLinBuff *pShbLinBuff; + + pShbLinBuff = (tShbLinBuff *) ShbIpcGetShMemPtr(pShbInstance_p); + ASSERT(pShbLinBuff->m_ShbLinMagicID == SBL_MAGIC_ID); + + return (pShbLinBuff); + +} + +// not inlined internal functions +int ShbCirSignalHandlerNewData(tShbInstance pShbInstance_p); +void ShbCirSignalHandlerReset(tShbInstance pShbInstance_p, + unsigned int fTimeOut_p); + +#endif + +//=========================================================================// +// // +// P U B L I C F U N C T I O N S // +// // +//=========================================================================// + +#if !defined(INLINE_ENABLED) +// not inlined external functions + +//--------------------------------------------------------------------------- +// Initialize Shared Buffer Module +//--------------------------------------------------------------------------- + +tShbError ShbInit(void) +{ + + tShbError ShbError; + + ShbError = ShbIpcInit(); + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Deinitialize Shared Buffer Module +//--------------------------------------------------------------------------- + +tShbError ShbExit(void) +{ + + tShbError ShbError; + + ShbError = ShbIpcExit(); + + return (ShbError); + +} + +//-------------------------------------------------------------------------// +// // +// C i r c u l a r S h a r e d B u f f e r // +// // +//-------------------------------------------------------------------------// + +//--------------------------------------------------------------------------- +// Allocate Circular Shared Buffer +//--------------------------------------------------------------------------- + +tShbError ShbCirAllocBuffer(unsigned long ulBufferSize_p, + const char *pszBufferID_p, + tShbInstance * ppShbInstance_p, + unsigned int *pfShbNewCreated_p) +{ + + tShbInstance pShbInstance; + tShbCirBuff *pShbCirBuff; + unsigned int fShbNewCreated; + unsigned long ulBufferDataSize; + unsigned long ulBufferTotalSize; + tShbError ShbError; + + // check arguments + if ((ulBufferSize_p == 0) || (ppShbInstance_p == NULL)) { + return (kShbInvalidArg); + } + + // calculate length of memory to allocate + ulBufferDataSize = + (ulBufferSize_p + + (SBC_BLOCK_ALIGNMENT - 1)) & ~(SBC_BLOCK_ALIGNMENT - 1); + ulBufferTotalSize = ulBufferDataSize + sizeof(tShbCirBuff); + + // allocate a new or open an existing shared buffer + ShbError = ShbIpcAllocBuffer(ulBufferTotalSize, pszBufferID_p, + &pShbInstance, &fShbNewCreated); + if (ShbError != kShbOk) { + goto Exit; + } + + if (pShbInstance == NULL) { + ShbError = kShbOutOfMem; + goto Exit; + } + + // get pointer to shared buffer + pShbCirBuff = (tShbCirBuff *) ShbIpcGetShMemPtr(pShbInstance); + + // if the shared buffer was new created, than this process has + // to initialize it, otherwise the buffer is already in use + // and *must not* be reseted + if (fShbNewCreated) { +#ifndef NDEBUG + { + memset(pShbCirBuff, 0xCC, ulBufferTotalSize); + } +#endif + + pShbCirBuff->m_ShbCirMagicID = SBC_MAGIC_ID; + pShbCirBuff->m_ulBufferTotalSize = ulBufferTotalSize; + pShbCirBuff->m_ulBufferDataSize = ulBufferDataSize; + pShbCirBuff->m_ulWrIndex = 0; + pShbCirBuff->m_ulRdIndex = 0; + pShbCirBuff->m_ulNumOfWriteJobs = 0; + pShbCirBuff->m_ulDataInUse = 0; + pShbCirBuff->m_ulDataApended = 0; + pShbCirBuff->m_ulBlocksApended = 0; + pShbCirBuff->m_ulDataReadable = 0; + pShbCirBuff->m_ulBlocksReadable = 0; + pShbCirBuff->m_pfnSigHndlrNewData = NULL; + pShbCirBuff->m_fBufferLocked = FALSE; + pShbCirBuff->m_pfnSigHndlrReset = NULL; + } else { + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + } + + Exit: + + *ppShbInstance_p = pShbInstance; + *pfShbNewCreated_p = fShbNewCreated; + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Release Circular Shared Buffer +//--------------------------------------------------------------------------- + +tShbError ShbCirReleaseBuffer(tShbInstance pShbInstance_p) +{ + + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbOk; + goto Exit; + } + + ShbError = ShbIpcReleaseBuffer(pShbInstance_p); + + Exit: + + return (ShbError); + +} + +#endif // !defined(INLINE_ENABLED) + +#if (!defined(SHAREDBUFF_INLINED)) || defined(INLINE_ENABLED) + +//--------------------------------------------------------------------------- +// Reset Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirResetBuffer(tShbInstance pShbInstance_p, + unsigned long ulTimeOut_p, + tShbCirSigHndlrReset + pfnSignalHandlerReset_p) +{ + + tShbCirBuff *pShbCirBuff; + unsigned long ulNumOfWriteJobs = 0; // d.k. GCC complains about uninitialized variable otherwise + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbInvalidArg; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // start reset job by setting request request in buffer header + ShbIpcEnterAtomicSection(pShbInstance_p); + { + if (!pShbCirBuff->m_fBufferLocked) { + ulNumOfWriteJobs = pShbCirBuff->m_ulNumOfWriteJobs; + + pShbCirBuff->m_fBufferLocked = TRUE; + pShbCirBuff->m_pfnSigHndlrReset = + pfnSignalHandlerReset_p; + } else { + ShbError = kShbAlreadyReseting; + } + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + if (ShbError != kShbOk) { + goto Exit; + } + + // if there is currently no running write operation then reset buffer + // immediately, otherwise wait until the last write job is ready by + // starting a signal process + if (ulNumOfWriteJobs == 0) { + // there is currently no running write operation + // -> reset buffer immediately + ShbCirSignalHandlerReset(pShbInstance_p, FALSE); + ShbError = kShbOk; + } else { + // there is currently at least one running write operation + // -> starting signal process to wait until the last write job is ready + ShbError = + ShbIpcStartSignalingJobReady(pShbInstance_p, ulTimeOut_p, + ShbCirSignalHandlerReset); + } + + Exit: + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Write data block to Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirWriteDataBlock(tShbInstance pShbInstance_p, + const void *pSrcDataBlock_p, + unsigned long ulDataBlockSize_p) +{ + + tShbCirBuff *pShbCirBuff; + tShbCirBlockSize ShbCirBlockSize; + unsigned int uiFullBlockSize; + unsigned int uiAlignFillBytes; + unsigned char *pShbCirDataPtr; + unsigned char *pScrDataPtr; + unsigned long ulDataSize; + unsigned long ulChunkSize; + unsigned long ulWrIndex = 0; // d.k. GCC complains about uninitialized variable otherwise + unsigned int fSignalNewData; + unsigned int fSignalReset; + tShbError ShbError; + tShbError ShbError2; + int fRes; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbInvalidArg; + goto Exit; + } + + if ((pSrcDataBlock_p == NULL) || (ulDataBlockSize_p == 0)) { + // nothing to do here + ShbError = kShbOk; + goto Exit; + } + + if (ulDataBlockSize_p > SBC_MAX_BLOCK_SIZE) { + ShbError = kShbExceedDataSizeLimit; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + pScrDataPtr = (unsigned char *)pSrcDataBlock_p; + fSignalNewData = FALSE; + fSignalReset = FALSE; + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // calculate data block size in circular buffer + ulDataSize = + (ulDataBlockSize_p + + (SBC_BLOCK_ALIGNMENT - 1)) & ~(SBC_BLOCK_ALIGNMENT - 1); + uiFullBlockSize = ulDataSize + sizeof(tShbCirBlockSize); // data size + header + uiAlignFillBytes = ulDataSize - ulDataBlockSize_p; + + ShbCirBlockSize.m_uiFullBlockSize = uiFullBlockSize; + ShbCirBlockSize.m_uiAlignFillBytes = uiAlignFillBytes; + + // reserve the needed memory for the write operation to do now + // and make necessary adjustments in the circular buffer header + ShbIpcEnterAtomicSection(pShbInstance_p); + { + // check if there is sufficient memory available to store + // the new data + fRes = + uiFullBlockSize <= + (pShbCirBuff->m_ulBufferDataSize - + pShbCirBuff->m_ulDataInUse); + if (fRes) { + // set write pointer for the write operation to do now + // to the current write pointer of the circular buffer + ulWrIndex = pShbCirBuff->m_ulWrIndex; + + // reserve the needed memory for the write operation to do now + pShbCirBuff->m_ulDataInUse += uiFullBlockSize; + + // set new write pointer behind the reserved memory + // for the write operation to do now + pShbCirBuff->m_ulWrIndex += uiFullBlockSize; + pShbCirBuff->m_ulWrIndex %= + pShbCirBuff->m_ulBufferDataSize; + + // increment number of currently (parallel running) + // write operations + pShbCirBuff->m_ulNumOfWriteJobs++; + } + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + if (!fRes) { + ShbError = kShbBufferFull; + goto Exit; + } + + // copy the data to the circular buffer + // (the copy process itself will be done outside of any + // critical/locked section) + pShbCirDataPtr = &pShbCirBuff->m_Data; // ptr to start of data area + + // write real size of current block (incl. alignment fill bytes) + *(tShbCirBlockSize *) (pShbCirDataPtr + ulWrIndex) = ShbCirBlockSize; + ulWrIndex += sizeof(tShbCirBlockSize); + ulWrIndex %= pShbCirBuff->m_ulBufferDataSize; + + if (ulWrIndex + ulDataBlockSize_p <= pShbCirBuff->m_ulBufferDataSize) { + // linear write operation + memcpy(pShbCirDataPtr + ulWrIndex, pScrDataPtr, + ulDataBlockSize_p); + } else { + // wrap-around write operation + ulChunkSize = pShbCirBuff->m_ulBufferDataSize - ulWrIndex; + memcpy(pShbCirDataPtr + ulWrIndex, pScrDataPtr, ulChunkSize); + memcpy(pShbCirDataPtr, pScrDataPtr + ulChunkSize, + ulDataBlockSize_p - ulChunkSize); + } + + // adjust header information for circular buffer with properties + // of the wiritten data block + ShbIpcEnterAtomicSection(pShbInstance_p); + { + pShbCirBuff->m_ulDataApended += uiFullBlockSize; + pShbCirBuff->m_ulBlocksApended++; + + // decrement number of currently (parallel running) write operations + if (!--pShbCirBuff->m_ulNumOfWriteJobs) { + // if there is no other write process running then + // set new size of readable (complete written) data and + // adjust number of readable blocks + pShbCirBuff->m_ulDataReadable += + pShbCirBuff->m_ulDataApended; + pShbCirBuff->m_ulBlocksReadable += + pShbCirBuff->m_ulBlocksApended; + + pShbCirBuff->m_ulDataApended = 0; + pShbCirBuff->m_ulBlocksApended = 0; + + fSignalNewData = TRUE; + fSignalReset = pShbCirBuff->m_fBufferLocked; + } + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + // signal new data event to a potentially reading application + if (fSignalNewData) { + ShbError2 = ShbIpcSignalNewData(pShbInstance_p); + if (ShbError == kShbOk) { + ShbError = ShbError2; + } + } + // signal that the last write job has been finished to allow + // a waiting application to reset the buffer now + if (fSignalReset) { + ShbError2 = ShbIpcSignalJobReady(pShbInstance_p); + if (ShbError == kShbOk) { + ShbError = ShbError2; + } + } + + Exit: + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Allocate block within the Circular Shared Buffer for chunk writing +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirAllocDataBlock(tShbInstance pShbInstance_p, + tShbCirChunk * pShbCirChunk_p, + unsigned long ulDataBufferSize_p) +{ + + tShbCirBuff *pShbCirBuff; + tShbCirBlockSize ShbCirBlockSize; + unsigned int uiFullBlockSize; + unsigned int uiAlignFillBytes; + unsigned char *pShbCirDataPtr; + unsigned long ulDataSize; + unsigned long ulWrIndex = 0; // d.k. GCC complains about uninitialized variable otherwise + tShbError ShbError; + int fRes; + + // check arguments + if ((pShbInstance_p == NULL) || (pShbCirChunk_p == NULL)) { + ShbError = kShbInvalidArg; + goto Exit; + } + + if (ulDataBufferSize_p == 0) { + ShbError = kShbInvalidArg; + goto Exit; + } + + if (ulDataBufferSize_p > SBC_MAX_BLOCK_SIZE) { + ShbError = kShbExceedDataSizeLimit; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // calculate data block size in circular buffer + ulDataSize = + (ulDataBufferSize_p + + (SBC_BLOCK_ALIGNMENT - 1)) & ~(SBC_BLOCK_ALIGNMENT - 1); + uiFullBlockSize = ulDataSize + sizeof(tShbCirBlockSize); // data size + header + uiAlignFillBytes = ulDataSize - ulDataBufferSize_p; + + ShbCirBlockSize.m_uiFullBlockSize = uiFullBlockSize; + ShbCirBlockSize.m_uiAlignFillBytes = uiAlignFillBytes; + + // reserve the needed memory for the write operation to do now + // and make necessary adjustments in the circular buffer header + ShbIpcEnterAtomicSection(pShbInstance_p); + { + // check if there is sufficient memory available to store + // the new data + fRes = + (uiFullBlockSize <= + (pShbCirBuff->m_ulBufferDataSize - + pShbCirBuff->m_ulDataInUse)); + if (fRes) { + // set write pointer for the write operation to do now + // to the current write pointer of the circular buffer + ulWrIndex = pShbCirBuff->m_ulWrIndex; + + // reserve the needed memory for the write operation to do now + pShbCirBuff->m_ulDataInUse += uiFullBlockSize; + + // set new write pointer behind the reserved memory + // for the write operation to do now + pShbCirBuff->m_ulWrIndex += uiFullBlockSize; + pShbCirBuff->m_ulWrIndex %= + pShbCirBuff->m_ulBufferDataSize; + + // increment number of currently (parallel running) + // write operations + pShbCirBuff->m_ulNumOfWriteJobs++; + } + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + if (!fRes) { + ShbError = kShbBufferFull; + goto Exit; + } + + // setup header information for allocated buffer + pShbCirDataPtr = &pShbCirBuff->m_Data; // ptr to start of data area + + // write real size of current block (incl. alignment fill bytes) + *(tShbCirBlockSize *) (pShbCirDataPtr + ulWrIndex) = ShbCirBlockSize; + ulWrIndex += sizeof(tShbCirBlockSize); + ulWrIndex %= pShbCirBuff->m_ulBufferDataSize; + + // setup chunk descriptor + pShbCirChunk_p->m_uiFullBlockSize = uiFullBlockSize; + pShbCirChunk_p->m_ulAvailableSize = ulDataBufferSize_p; + pShbCirChunk_p->m_ulWrIndex = ulWrIndex; + pShbCirChunk_p->m_fBufferCompleted = FALSE; + + Exit: + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Write data chunk into an allocated buffer of the Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirWriteDataChunk(tShbInstance pShbInstance_p, + tShbCirChunk * pShbCirChunk_p, + const void *pSrcDataChunk_p, + unsigned long ulDataChunkSize_p, + unsigned int + *pfBufferCompleted_p) +{ + + tShbCirBuff *pShbCirBuff; + unsigned char *pShbCirDataPtr; + unsigned char *pScrDataPtr; + unsigned long ulSubChunkSize; + unsigned long ulWrIndex; + unsigned int fBufferCompleted; + unsigned int fSignalNewData; + unsigned int fSignalReset; + tShbError ShbError; + tShbError ShbError2; + + // check arguments + if ((pShbInstance_p == NULL) || (pShbCirChunk_p == NULL) + || (pfBufferCompleted_p == NULL)) { + ShbError = kShbInvalidArg; + goto Exit; + } + + if ((pSrcDataChunk_p == NULL) || (ulDataChunkSize_p == 0)) { + // nothing to do here + ShbError = kShbOk; + goto Exit; + } + + if (pShbCirChunk_p->m_fBufferCompleted) { + ShbError = kShbBufferAlreadyCompleted; + goto Exit; + } + + if (ulDataChunkSize_p > pShbCirChunk_p->m_ulAvailableSize) { + ShbError = kShbExceedDataSizeLimit; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + pScrDataPtr = (unsigned char *)pSrcDataChunk_p; + fSignalNewData = FALSE; + fSignalReset = FALSE; + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + ulWrIndex = pShbCirChunk_p->m_ulWrIndex; + + // copy the data to the circular buffer + // (the copy process itself will be done outside of any + // critical/locked section) + pShbCirDataPtr = &pShbCirBuff->m_Data; // ptr to start of data area + + if (ulWrIndex + ulDataChunkSize_p <= pShbCirBuff->m_ulBufferDataSize) { + // linear write operation + memcpy(pShbCirDataPtr + ulWrIndex, pScrDataPtr, + ulDataChunkSize_p); + } else { + // wrap-around write operation + ulSubChunkSize = pShbCirBuff->m_ulBufferDataSize - ulWrIndex; + memcpy(pShbCirDataPtr + ulWrIndex, pScrDataPtr, ulSubChunkSize); + memcpy(pShbCirDataPtr, pScrDataPtr + ulSubChunkSize, + ulDataChunkSize_p - ulSubChunkSize); + } + + // adjust chunk descriptor + ulWrIndex += ulDataChunkSize_p; + ulWrIndex %= pShbCirBuff->m_ulBufferDataSize; + + pShbCirChunk_p->m_ulAvailableSize -= ulDataChunkSize_p; + pShbCirChunk_p->m_ulWrIndex = ulWrIndex; + + fBufferCompleted = (pShbCirChunk_p->m_ulAvailableSize == 0); + pShbCirChunk_p->m_fBufferCompleted = fBufferCompleted; + + // if the complete allocated buffer is filled with data then + // adjust header information for circular buffer with properties + // of the wiritten data block + if (fBufferCompleted) { + ShbIpcEnterAtomicSection(pShbInstance_p); + { + pShbCirBuff->m_ulDataApended += + pShbCirChunk_p->m_uiFullBlockSize; + pShbCirBuff->m_ulBlocksApended++; + + // decrement number of currently (parallel running) write operations + if (!--pShbCirBuff->m_ulNumOfWriteJobs) { + // if there is no other write process running then + // set new size of readable (complete written) data and + // adjust number of readable blocks + pShbCirBuff->m_ulDataReadable += + pShbCirBuff->m_ulDataApended; + pShbCirBuff->m_ulBlocksReadable += + pShbCirBuff->m_ulBlocksApended; + + pShbCirBuff->m_ulDataApended = 0; + pShbCirBuff->m_ulBlocksApended = 0; + + fSignalNewData = TRUE; + fSignalReset = pShbCirBuff->m_fBufferLocked; + } + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + } + + // signal new data event to a potentially reading application + if (fSignalNewData) { + ShbError2 = ShbIpcSignalNewData(pShbInstance_p); + if (ShbError == kShbOk) { + ShbError = ShbError2; + } + } + // signal that the last write job has been finished to allow + // a waiting application to reset the buffer now + if (fSignalReset) { + ShbError2 = ShbIpcSignalJobReady(pShbInstance_p); + if (ShbError == kShbOk) { + ShbError = ShbError2; + } + } + + *pfBufferCompleted_p = fBufferCompleted; + + Exit: + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Read data block from Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirReadDataBlock(tShbInstance pShbInstance_p, + void *pDstDataBlock_p, + unsigned long ulRdBuffSize_p, + unsigned long *pulDataBlockSize_p) +{ + + tShbCirBuff *pShbCirBuff; + tShbCirBlockSize ShbCirBlockSize; + unsigned long ulDataReadable; + unsigned char *pShbCirDataPtr; + unsigned char *pDstDataPtr; + unsigned long ulDataSize = 0; // d.k. GCC complains about uninitialized variable otherwise + unsigned long ulChunkSize; + unsigned long ulRdIndex; + tShbError ShbError; + + // check arguments + if ((pShbInstance_p == NULL) || (pulDataBlockSize_p == NULL)) { + return (kShbInvalidArg); + } + + if ((pDstDataBlock_p == NULL) || (ulRdBuffSize_p == 0)) { + // nothing to do here + ShbError = kShbOk; + goto Exit; + } + + ShbError = kShbOk; + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + pDstDataPtr = (unsigned char *)pDstDataBlock_p; + ulDataSize = 0; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // get total number of readable bytes for the whole circular buffer + ShbIpcEnterAtomicSection(pShbInstance_p); + { + ulDataReadable = pShbCirBuff->m_ulDataReadable; + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + // if there are readable data available, then there must be at least + // one complete readable data block + if (ulDataReadable > 0) { + // get pointer to start of data area and current read index + pShbCirDataPtr = &pShbCirBuff->m_Data; // ptr to start of data area + ulRdIndex = pShbCirBuff->m_ulRdIndex; + + // get real size of current block (incl. alignment fill bytes) + ShbCirBlockSize = + *(tShbCirBlockSize *) (pShbCirDataPtr + ulRdIndex); + ulRdIndex += sizeof(tShbCirBlockSize); + ulRdIndex %= pShbCirBuff->m_ulBufferDataSize; + + // get size of user data inside the current block + ulDataSize = + ShbCirBlockSize.m_uiFullBlockSize - + ShbCirBlockSize.m_uiAlignFillBytes; + ulDataSize -= sizeof(tShbCirBlockSize); + } + + // ulDataSize = MIN(ulDataSize, ulRdBuffSize_p); + if (ulDataSize > ulRdBuffSize_p) { + ulDataSize = ulRdBuffSize_p; + ShbError = kShbDataTruncated; + } + + if (ulDataSize == 0) { + // nothing to do here + ShbError = kShbNoReadableData; + goto Exit; + } + + // copy the data from the circular buffer + // (the copy process itself will be done outside of any + // critical/locked section) + if (ulRdIndex + ulDataSize <= pShbCirBuff->m_ulBufferDataSize) { + // linear read operation + memcpy(pDstDataPtr, pShbCirDataPtr + ulRdIndex, ulDataSize); + } else { + // wrap-around read operation + ulChunkSize = pShbCirBuff->m_ulBufferDataSize - ulRdIndex; + memcpy(pDstDataPtr, pShbCirDataPtr + ulRdIndex, ulChunkSize); + memcpy(pDstDataPtr + ulChunkSize, pShbCirDataPtr, + ulDataSize - ulChunkSize); + } + +#ifndef NDEBUG + { + tShbCirBlockSize ClrShbCirBlockSize; + + if (ulRdIndex + ulDataSize <= pShbCirBuff->m_ulBufferDataSize) { + // linear buffer + memset(pShbCirDataPtr + ulRdIndex, 0xDD, ulDataSize); + } else { + // wrap-around read operation + ulChunkSize = + pShbCirBuff->m_ulBufferDataSize - ulRdIndex; + memset(pShbCirDataPtr + ulRdIndex, 0xDD, ulChunkSize); + memset(pShbCirDataPtr, 0xDD, ulDataSize - ulChunkSize); + } + + ClrShbCirBlockSize.m_uiFullBlockSize = /*(unsigned int) */ -1; // -1 = xFFFFFFF + ClrShbCirBlockSize.m_uiAlignFillBytes = /*(unsigned int) */ -1; // -1 = Fxxxxxxx + *(tShbCirBlockSize *) (pShbCirDataPtr + + pShbCirBuff->m_ulRdIndex) = + ClrShbCirBlockSize; + } +#endif // #ifndef NDEBUG + + // set new size of readable data, data in use, new read index + // and adjust number of readable blocks + ShbIpcEnterAtomicSection(pShbInstance_p); + { + pShbCirBuff->m_ulDataInUse -= ShbCirBlockSize.m_uiFullBlockSize; + pShbCirBuff->m_ulDataReadable -= + ShbCirBlockSize.m_uiFullBlockSize; + pShbCirBuff->m_ulBlocksReadable--; + + //$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ + if ((pShbCirBuff->m_ulDataInUse == 0) + && (pShbCirBuff->m_ulDataReadable == 0)) { + ASSERT(pShbCirBuff->m_ulBlocksReadable == 0); + + pShbCirBuff->m_ulWrIndex = 0; + pShbCirBuff->m_ulRdIndex = 0; + } else + //$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ + { + pShbCirBuff->m_ulRdIndex += + ShbCirBlockSize.m_uiFullBlockSize; + pShbCirBuff->m_ulRdIndex %= + pShbCirBuff->m_ulBufferDataSize; + } + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + Exit: + + *pulDataBlockSize_p = ulDataSize; + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Get data size of next readable block from Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirGetReadDataSize(tShbInstance pShbInstance_p, + unsigned long + *pulDataBlockSize_p) +{ + + tShbCirBuff *pShbCirBuff; + unsigned long ulDataReadable; + unsigned char *pShbCirDataPtr; + tShbCirBlockSize ShbCirBlockSize; + unsigned long ulDataSize; + tShbError ShbError; + + // check arguments + if ((pShbInstance_p == NULL) || (pulDataBlockSize_p == NULL)) { + return (kShbInvalidArg); + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ulDataSize = 0; + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // get total number of readable bytes for the whole circular buffer + ShbIpcEnterAtomicSection(pShbInstance_p); + { + ulDataReadable = pShbCirBuff->m_ulDataReadable; + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + // if there are readable data available, then there must be at least + // one complete readable data block + if (ulDataReadable > 0) { + pShbCirDataPtr = + &pShbCirBuff->m_Data + pShbCirBuff->m_ulRdIndex; + + // get real size of current block (incl. alignment fill bytes) + ShbCirBlockSize = *(tShbCirBlockSize *) pShbCirDataPtr; + + // get size of user data inside the current block + ulDataSize = + ShbCirBlockSize.m_uiFullBlockSize - + ShbCirBlockSize.m_uiAlignFillBytes; + ulDataSize -= sizeof(tShbCirBlockSize); + } + + Exit: + + *pulDataBlockSize_p = ulDataSize; + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Get number of readable blocks from Circular Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirGetReadBlockCount(tShbInstance pShbInstance_p, + unsigned long + *pulDataBlockCount_p) +{ + + tShbCirBuff *pShbCirBuff; + unsigned long ulBlockCount; + tShbError ShbError; + + // check arguments + if ((pShbInstance_p == NULL) || (pulDataBlockCount_p == NULL)) { + ShbError = kShbInvalidArg; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ulBlockCount = 0; + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + ShbIpcEnterAtomicSection(pShbInstance_p); + { + ulBlockCount = pShbCirBuff->m_ulBlocksReadable; + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + *pulDataBlockCount_p = ulBlockCount; + + Exit: + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Set application handler to signal new data for Circular Shared Buffer +// d.k.: new parameter priority as enum +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbCirSetSignalHandlerNewData(tShbInstance + pShbInstance_p, + tShbCirSigHndlrNewData + pfnSignalHandlerNewData_p, + tShbPriority + ShbPriority_p) +{ + + tShbCirBuff *pShbCirBuff; + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbInvalidArg; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + if (pfnSignalHandlerNewData_p != NULL) { + // set a new signal handler + if (pShbCirBuff->m_pfnSigHndlrNewData != NULL) { + ShbError = kShbAlreadySignaling; + goto Exit; + } + + pShbCirBuff->m_pfnSigHndlrNewData = pfnSignalHandlerNewData_p; + ShbError = + ShbIpcStartSignalingNewData(pShbInstance_p, + ShbCirSignalHandlerNewData, + ShbPriority_p); + } else { + // remove existing signal handler + ShbError = ShbIpcStopSignalingNewData(pShbInstance_p); + if (pShbCirBuff->m_pfnSigHndlrNewData != NULL) { + pShbCirBuff->m_pfnSigHndlrNewData(pShbInstance_p, 0); + } + pShbCirBuff->m_pfnSigHndlrNewData = NULL; + } + + Exit: + + return (ShbError); + +} + +#endif + +#if !defined(INLINE_ENABLED) + +//--------------------------------------------------------------------------- +// DEBUG: Trace Circular Shared Buffer +//--------------------------------------------------------------------------- + +#ifndef NDEBUG +tShbError ShbCirTraceBuffer(tShbInstance pShbInstance_p) +{ + + tShbCirBuff *pShbCirBuff; + char szMagigID[sizeof(SBC_MAGIC_ID) + 1]; + tShbCirBlockSize ShbCirBlockSize; + unsigned long ulDataReadable; + unsigned char *pShbCirDataPtr; + unsigned long ulBlockIndex; + unsigned int nBlockCount; + unsigned long ulDataSize; + unsigned long ulChunkSize; + unsigned long ulRdIndex; + tShbError ShbError; + + TRACE0("\n\n##### Circular Shared Buffer #####\n"); + + // check arguments + if (pShbInstance_p == NULL) { + TRACE1("\nERROR: invalid buffer address (0x%08lX)\n", + (unsigned long)pShbInstance_p); + ShbError = kShbInvalidArg; + goto Exit; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + *(unsigned long *)&szMagigID[0] = pShbCirBuff->m_ShbCirMagicID; + szMagigID[sizeof(SBC_MAGIC_ID)] = '\0'; + + ShbIpcEnterAtomicSection(pShbInstance_p); + { + TRACE1("\nBuffer Address: 0x%08lX\n", + (unsigned long)pShbCirBuff); + + TRACE0("\nHeader Info:"); + TRACE2("\nMagigID: '%s' (%08lX)", szMagigID, + pShbCirBuff->m_ShbCirMagicID); + TRACE1("\nBufferTotalSize: %4lu [Bytes]", + pShbCirBuff->m_ulBufferTotalSize); + TRACE1("\nBufferDataSize: %4lu [Bytes]", + pShbCirBuff->m_ulBufferDataSize); + TRACE1("\nWrIndex: %4lu", pShbCirBuff->m_ulWrIndex); + TRACE1("\nRdIndex: %4lu", pShbCirBuff->m_ulRdIndex); + TRACE1("\nNumOfWriteJobs: %4lu", + pShbCirBuff->m_ulNumOfWriteJobs); + TRACE1("\nDataInUse: %4lu [Bytes]", + pShbCirBuff->m_ulDataInUse); + TRACE1("\nDataApended: %4lu [Bytes]", + pShbCirBuff->m_ulDataApended); + TRACE1("\nBlocksApended: %4lu", + pShbCirBuff->m_ulBlocksApended); + TRACE1("\nDataReadable: %4lu [Bytes]", + pShbCirBuff->m_ulDataReadable); + TRACE1("\nBlocksReadable: %4lu", + pShbCirBuff->m_ulBlocksReadable); + TRACE1("\nSigHndlrNewData: %08lX", + (unsigned long)pShbCirBuff->m_pfnSigHndlrNewData); + TRACE1("\nBufferLocked: %d", pShbCirBuff->m_fBufferLocked); + TRACE1("\nSigHndlrReset: %08lX", + (unsigned long)pShbCirBuff->m_pfnSigHndlrReset); + + ShbTraceDump(&pShbCirBuff->m_Data, + pShbCirBuff->m_ulBufferDataSize, 0x00000000L, + "\nData Area:"); + + ulDataReadable = pShbCirBuff->m_ulDataReadable; + nBlockCount = 1; + ulBlockIndex = pShbCirBuff->m_ulRdIndex; + + while (ulDataReadable > 0) { + TRACE1("\n\n--- Block #%u ---", nBlockCount); + + // get pointer to start of data area and current read index + pShbCirDataPtr = &pShbCirBuff->m_Data; // ptr to start of data area + ulRdIndex = ulBlockIndex; + + // get real size of current block (incl. alignment fill bytes) + ShbCirBlockSize = + *(tShbCirBlockSize *) (pShbCirDataPtr + ulRdIndex); + ulRdIndex += sizeof(tShbCirBlockSize); + ulRdIndex %= pShbCirBuff->m_ulBufferDataSize; + + // get size of user data inside the current block + ulDataSize = + ShbCirBlockSize.m_uiFullBlockSize - + ShbCirBlockSize.m_uiAlignFillBytes; + ulDataSize -= sizeof(tShbCirBlockSize); + + TRACE1 + ("\nFull Data Size: %4u [Bytes] (incl. header and alignment fill bytes)", + ShbCirBlockSize.m_uiFullBlockSize); + TRACE1("\nUser Data Size: %4lu [Bytes]", + ulDataSize); + TRACE1("\nAlignment Fill Bytes: %4u [Bytes]", + ShbCirBlockSize.m_uiAlignFillBytes); + + if (ulRdIndex + ulDataSize <= + pShbCirBuff->m_ulBufferDataSize) { + // linear data buffer + ShbTraceDump(pShbCirDataPtr + ulRdIndex, + ulDataSize, 0x00000000L, NULL); + } else { + // wrap-around data buffer + ulChunkSize = + pShbCirBuff->m_ulBufferDataSize - ulRdIndex; + ShbTraceDump(pShbCirDataPtr + ulRdIndex, + ulChunkSize, 0x00000000L, NULL); + ShbTraceDump(pShbCirDataPtr, + ulDataSize - ulChunkSize, + ulChunkSize, NULL); + } + + nBlockCount++; + + ulBlockIndex += ShbCirBlockSize.m_uiFullBlockSize; + ulBlockIndex %= pShbCirBuff->m_ulBufferDataSize; + + ulDataReadable -= ShbCirBlockSize.m_uiFullBlockSize; + } + + ASSERT(pShbCirBuff->m_ulBlocksReadable == nBlockCount - 1); + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + Exit: + + return (ShbError); + +} +#endif + +//-------------------------------------------------------------------------// +// // +// L i n e a r S h a r e d B u f f e r // +// // +//-------------------------------------------------------------------------// + +//--------------------------------------------------------------------------- +// Allocate Linear Shared Buffer +//--------------------------------------------------------------------------- + +tShbError ShbLinAllocBuffer(unsigned long ulBufferSize_p, + const char *pszBufferID_p, + tShbInstance * ppShbInstance_p, + unsigned int *pfShbNewCreated_p) +{ + + tShbInstance pShbInstance; + tShbLinBuff *pShbLinBuff; + unsigned int fShbNewCreated; + unsigned long ulBufferDataSize; + unsigned long ulBufferTotalSize; + tShbError ShbError; + + // check arguments + if ((ulBufferSize_p == 0) || (ppShbInstance_p == NULL)) { + return (kShbInvalidArg); + } + + // calculate length of memory to allocate + ulBufferDataSize = + (ulBufferSize_p + + (SBL_BLOCK_ALIGNMENT - 1)) & ~(SBL_BLOCK_ALIGNMENT - 1); + ulBufferTotalSize = ulBufferDataSize + sizeof(tShbLinBuff); + + // allocate a new or open an existing shared buffer + ShbError = ShbIpcAllocBuffer(ulBufferTotalSize, pszBufferID_p, + &pShbInstance, &fShbNewCreated); + if (ShbError != kShbOk) { + goto Exit; + } + + if (pShbInstance == NULL) { + ShbError = kShbOutOfMem; + goto Exit; + } + + // get pointer to shared buffer + pShbLinBuff = (tShbLinBuff *) ShbIpcGetShMemPtr(pShbInstance); + + // if the shared buffer was new created, than this process has + // to initialize it, otherwise the buffer is already in use + // and *must not* be reseted + if (fShbNewCreated) { +#ifndef NDEBUG + { + memset(pShbLinBuff, 0xCC, ulBufferTotalSize); + } +#endif + + pShbLinBuff->m_ShbLinMagicID = SBL_MAGIC_ID; + pShbLinBuff->m_ulBufferTotalSize = ulBufferTotalSize; + pShbLinBuff->m_ulBufferDataSize = ulBufferDataSize; + } else { + if (pShbLinBuff->m_ShbLinMagicID != SBL_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + } + + Exit: + + *ppShbInstance_p = pShbInstance; + *pfShbNewCreated_p = fShbNewCreated; + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Release Linear Shared Buffer +//--------------------------------------------------------------------------- + +tShbError ShbLinReleaseBuffer(tShbInstance pShbInstance_p) +{ + + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbOk; + goto Exit; + } + + ShbError = ShbIpcReleaseBuffer(pShbInstance_p); + + Exit: + + return (ShbError); + +} + +#endif // !defined(INLINE_ENABLED) + +#if (!defined(SHAREDBUFF_INLINED)) || defined(INLINE_ENABLED) + +//--------------------------------------------------------------------------- +// Write data block to Linear Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbLinWriteDataBlock(tShbInstance pShbInstance_p, + unsigned long ulDstBufferOffs_p, + const void *pSrcDataBlock_p, + unsigned long ulDataBlockSize_p) +{ + + tShbLinBuff *pShbLinBuff; + unsigned char *pShbLinDataPtr; + unsigned char *pScrDataPtr; + unsigned long ulBufferDataSize; + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbInvalidArg; + goto Exit; + } + + if ((pSrcDataBlock_p == NULL) || (ulDataBlockSize_p == 0)) { + // nothing to do here + ShbError = kShbOk; + goto Exit; + } + + if (ulDataBlockSize_p > SBL_MAX_BLOCK_SIZE) { + ShbError = kShbExceedDataSizeLimit; + goto Exit; + } + + pShbLinBuff = ShbLinGetBuffer(pShbInstance_p); + pScrDataPtr = (unsigned char *)pSrcDataBlock_p; + ShbError = kShbOk; + + if (pShbLinBuff->m_ShbLinMagicID != SBL_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // check if offeset and size for the write operation matches with + // the size of the shared buffer + ulBufferDataSize = pShbLinBuff->m_ulBufferDataSize; + if ((ulDstBufferOffs_p > ulBufferDataSize) || + (ulDataBlockSize_p > ulBufferDataSize) || + ((ulDstBufferOffs_p + ulDataBlockSize_p) > ulBufferDataSize)) { + ShbError = kShbDataOutsideBufferArea; + goto Exit; + } + + // copy the data to the linear buffer + // (the copy process will be done inside of any critical/locked section) + pShbLinDataPtr = &pShbLinBuff->m_Data; // ptr to start of data area + pShbLinDataPtr += ulDstBufferOffs_p; + + ShbIpcEnterAtomicSection(pShbInstance_p); + { + memcpy(pShbLinDataPtr, pScrDataPtr, ulDataBlockSize_p); + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + Exit: + + return (ShbError); + +} + +//--------------------------------------------------------------------------- +// Read data block from Linear Shared Buffer +//--------------------------------------------------------------------------- + +INLINE_FUNCTION tShbError ShbLinReadDataBlock(tShbInstance pShbInstance_p, + void *pDstDataBlock_p, + unsigned long ulSrcBufferOffs_p, + unsigned long ulDataBlockSize_p) +{ + + tShbLinBuff *pShbLinBuff; + unsigned char *pShbLinDataPtr; + unsigned char *pDstDataPtr; + unsigned long ulBufferDataSize; + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + ShbError = kShbInvalidArg; + goto Exit; + } + + if ((pDstDataBlock_p == NULL) || (ulDataBlockSize_p == 0)) { + // nothing to do here + ShbError = kShbOk; + goto Exit; + } + + if (ulDataBlockSize_p > SBL_MAX_BLOCK_SIZE) { + ShbError = kShbExceedDataSizeLimit; + goto Exit; + } + + pShbLinBuff = ShbLinGetBuffer(pShbInstance_p); + pDstDataPtr = (unsigned char *)pDstDataBlock_p; + ShbError = kShbOk; + + if (pShbLinBuff->m_ShbLinMagicID != SBL_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + // check if offeset and size for the read operation matches with + // the size of the shared buffer + ulBufferDataSize = pShbLinBuff->m_ulBufferDataSize; + if ((ulSrcBufferOffs_p > ulBufferDataSize) || + (ulDataBlockSize_p > ulBufferDataSize) || + ((ulSrcBufferOffs_p + ulDataBlockSize_p) > ulBufferDataSize)) { + ShbError = kShbDataOutsideBufferArea; + goto Exit; + } + + // copy the data to the linear buffer + // (the copy process will be done inside of any critical/locked section) + pShbLinDataPtr = &pShbLinBuff->m_Data; // ptr to start of data area + pShbLinDataPtr += ulSrcBufferOffs_p; + + ShbIpcEnterAtomicSection(pShbInstance_p); + { + memcpy(pDstDataPtr, pShbLinDataPtr, ulDataBlockSize_p); + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + Exit: + + return (ShbError); + +} + +#endif + +#if !defined(INLINE_ENABLED) + +//--------------------------------------------------------------------------- +// DEBUG: Trace Linear Shared Buffer +//--------------------------------------------------------------------------- + +#ifndef NDEBUG +tShbError ShbLinTraceBuffer(tShbInstance pShbInstance_p) +{ + + tShbLinBuff *pShbLinBuff; + char szMagigID[sizeof(SBL_MAGIC_ID) + 1]; + tShbError ShbError; + + TRACE0("\n\n##### Linear Shared Buffer #####\n"); + + // check arguments + if (pShbInstance_p == NULL) { + TRACE1("\nERROR: invalid buffer address (0x%08lX)\n", + (unsigned long)pShbInstance_p); + ShbError = kShbInvalidArg; + goto Exit; + } + + pShbLinBuff = ShbLinGetBuffer(pShbInstance_p); + ShbError = kShbOk; + + if (pShbLinBuff->m_ShbLinMagicID != SBL_MAGIC_ID) { + ShbError = kShbInvalidBufferType; + goto Exit; + } + + *(unsigned int *)&szMagigID[0] = pShbLinBuff->m_ShbLinMagicID; + szMagigID[sizeof(SBL_MAGIC_ID)] = '\0'; + + ShbIpcEnterAtomicSection(pShbInstance_p); + { + TRACE1("\nBuffer Address: 0x%08lX\n", + (unsigned long)pShbLinBuff); + + TRACE0("\nHeader Info:"); + TRACE2("\nMagigID: '%s' (%08X)", szMagigID, + pShbLinBuff->m_ShbLinMagicID); + TRACE1("\nBufferTotalSize: %4lu [Bytes]", + pShbLinBuff->m_ulBufferTotalSize); + TRACE1("\nBufferDataSize: %4lu [Bytes]", + pShbLinBuff->m_ulBufferDataSize); + + ShbTraceDump(&pShbLinBuff->m_Data, + pShbLinBuff->m_ulBufferDataSize, 0x00000000L, + "\nData Area:"); + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + Exit: + + return (ShbError); + +} +#endif + +//--------------------------------------------------------------------------- +// Dump buffer contents +//--------------------------------------------------------------------------- + +#ifndef NDEBUG +tShbError ShbTraceDump(const unsigned char *pabStartAddr_p, + unsigned long ulDataSize_p, + unsigned long ulAddrOffset_p, const char *pszInfoText_p) +{ + + const unsigned char *pabBuffData; + unsigned long ulBuffSize; + unsigned char bData; + int nRow; + int nCol; + + // get pointer to buffer and length of buffer + pabBuffData = pabStartAddr_p; + ulBuffSize = ulDataSize_p; + + if (pszInfoText_p != NULL) { + TRACE0(pszInfoText_p); + } + // dump buffer contents + for (nRow = 0;; nRow++) { + TRACE1("\n%08lX: ", + (unsigned long)(nRow * 0x10) + ulAddrOffset_p); + + for (nCol = 0; nCol < 16; nCol++) { + if ((unsigned long)nCol < ulBuffSize) { + TRACE1("%02X ", + (unsigned int)*(pabBuffData + nCol)); + } else { + TRACE0(" "); + } + } + + TRACE0(" "); + + for (nCol = 0; nCol < 16; nCol++) { + bData = *pabBuffData++; + if ((unsigned long)nCol < ulBuffSize) { + if ((bData >= 0x20) && (bData < 0x7F)) { + TRACE1("%c", bData); + } else { + TRACE0("."); + } + } else { + TRACE0(" "); + } + } + + if (ulBuffSize > 16) { + ulBuffSize -= 16; + } else { + break; + } + } + + return (kShbOk); + +} +#endif // #ifndef NDEBUG + +//=========================================================================// +// // +// P R I V A T E F U N C T I O N S // +// // +//=========================================================================// + +//--------------------------------------------------------------------------- +// Handler to signal new data event for Circular Shared Buffer +//--------------------------------------------------------------------------- + +int ShbCirSignalHandlerNewData(tShbInstance pShbInstance_p) +{ + + tShbCirBuff *pShbCirBuff; + unsigned long ulDataSize; + unsigned long ulBlockCount; + tShbError ShbError; + + // check arguments + if (pShbInstance_p == NULL) { + return FALSE; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + ShbError = kShbOk; + + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + return FALSE; + } + + // call application handler + if (pShbCirBuff->m_pfnSigHndlrNewData != NULL) { +/* do + {*/ + ShbError = ShbCirGetReadDataSize(pShbInstance_p, &ulDataSize); + if ((ulDataSize > 0) && (ShbError == kShbOk)) { + pShbCirBuff->m_pfnSigHndlrNewData(pShbInstance_p, + ulDataSize); + } + + ShbError = + ShbCirGetReadBlockCount(pShbInstance_p, &ulBlockCount); +/* } + while ((ulBlockCount > 0) && (ShbError == kShbOk));*/ + } + // Return TRUE if there are pending blocks. + // In that case ShbIpc tries to call this function again immediately if there + // is no other filled shared buffer with higher priority. + return ((ulBlockCount > 0) && (ShbError == kShbOk)); + +} + +//--------------------------------------------------------------------------- +// Handler to reset Circular Shared Buffer +//--------------------------------------------------------------------------- + +void ShbCirSignalHandlerReset(tShbInstance pShbInstance_p, + unsigned int fTimeOut_p) +{ + + tShbCirBuff *pShbCirBuff; + + // check arguments + if (pShbInstance_p == NULL) { + return; + } + + pShbCirBuff = ShbCirGetBuffer(pShbInstance_p); + if (pShbCirBuff->m_ShbCirMagicID != SBC_MAGIC_ID) { + return; + } + + // reset buffer header + if (!fTimeOut_p) { + ShbIpcEnterAtomicSection(pShbInstance_p); + { + pShbCirBuff->m_ulWrIndex = 0; + pShbCirBuff->m_ulRdIndex = 0; + pShbCirBuff->m_ulNumOfWriteJobs = 0; + pShbCirBuff->m_ulDataInUse = 0; + pShbCirBuff->m_ulDataApended = 0; + pShbCirBuff->m_ulBlocksApended = 0; + pShbCirBuff->m_ulDataReadable = 0; + pShbCirBuff->m_ulBlocksReadable = 0; + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + +#ifndef NDEBUG + { + memset(&pShbCirBuff->m_Data, 0xCC, + pShbCirBuff->m_ulBufferDataSize); + } +#endif + } + + // call application handler + if (pShbCirBuff->m_pfnSigHndlrReset != NULL) { + pShbCirBuff->m_pfnSigHndlrReset(pShbInstance_p, fTimeOut_p); + } + + // unlock buffer + ShbIpcEnterAtomicSection(pShbInstance_p); + { + pShbCirBuff->m_fBufferLocked = FALSE; + pShbCirBuff->m_pfnSigHndlrReset = NULL; + } + ShbIpcLeaveAtomicSection(pShbInstance_p); + + return; + +} + +#endif + +// EOF |