Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 1 | /**************************************************************************** |
| 2 | |
| 3 | (c) SYSTEC electronic GmbH, D-07973 Greiz, August-Bebel-Str. 29 |
| 4 | www.systec-electronic.com |
| 5 | |
| 6 | Project: Project independend shared buffer (linear + circular) |
| 7 | |
| 8 | Description: Implementation of platform specific part for the |
| 9 | shared buffer |
| 10 | (Implementation for Linux KernelSpace) |
| 11 | |
| 12 | License: |
| 13 | |
| 14 | Redistribution and use in source and binary forms, with or without |
| 15 | modification, are permitted provided that the following conditions |
| 16 | are met: |
| 17 | |
| 18 | 1. Redistributions of source code must retain the above copyright |
| 19 | notice, this list of conditions and the following disclaimer. |
| 20 | |
| 21 | 2. Redistributions in binary form must reproduce the above copyright |
| 22 | notice, this list of conditions and the following disclaimer in the |
| 23 | documentation and/or other materials provided with the distribution. |
| 24 | |
| 25 | 3. Neither the name of SYSTEC electronic GmbH nor the names of its |
| 26 | contributors may be used to endorse or promote products derived |
| 27 | from this software without prior written permission. For written |
| 28 | permission, please contact info@systec-electronic.com. |
| 29 | |
| 30 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 31 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 32 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 33 | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 34 | COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 35 | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 36 | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 37 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 38 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 39 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| 40 | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 41 | POSSIBILITY OF SUCH DAMAGE. |
| 42 | |
| 43 | Severability Clause: |
| 44 | |
| 45 | If a provision of this License is or becomes illegal, invalid or |
| 46 | unenforceable in any jurisdiction, that shall not affect: |
| 47 | 1. the validity or enforceability in that jurisdiction of any other |
| 48 | provision of this License; or |
| 49 | 2. the validity or enforceability in other jurisdictions of that or |
| 50 | any other provision of this License. |
| 51 | |
| 52 | ------------------------------------------------------------------------- |
| 53 | |
| 54 | 2006/06/28 -rs: V 1.00 (initial version) |
| 55 | |
| 56 | ****************************************************************************/ |
| 57 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 58 | #include "global.h" |
| 59 | #include "SharedBuff.h" |
| 60 | #include "ShbIpc.h" |
| 61 | #include "ShbLinuxKernel.h" |
| 62 | #include "Debug.h" |
| 63 | |
| 64 | #include <linux/string.h> |
| 65 | #include <linux/module.h> |
| 66 | #include <asm/processor.h> |
| 67 | //#include <linux/vmalloc.h> |
| 68 | #include <linux/sched.h> |
| 69 | #include <linux/param.h> |
| 70 | #include <linux/spinlock.h> |
| 71 | #include <linux/wait.h> |
| 72 | #include <linux/completion.h> |
| 73 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 74 | /***************************************************************************/ |
| 75 | /* */ |
| 76 | /* */ |
| 77 | /* G L O B A L D E F I N I T I O N S */ |
| 78 | /* */ |
| 79 | /* */ |
| 80 | /***************************************************************************/ |
| 81 | |
| 82 | #if (!defined(SHBIPC_INLINED)) || defined(SHBIPC_INLINE_ENABLED) |
| 83 | |
| 84 | //--------------------------------------------------------------------------- |
| 85 | // Configuration |
| 86 | //--------------------------------------------------------------------------- |
| 87 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 88 | //--------------------------------------------------------------------------- |
| 89 | // Constant definitions |
| 90 | //--------------------------------------------------------------------------- |
| 91 | |
| 92 | #define MAX_LEN_BUFFER_ID 256 |
| 93 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 94 | #define TIMEOUT_ENTER_ATOMIC 1000 // (ms) for debgging: INFINITE |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 95 | #define TIMEOUT_TERM_THREAD 1000 |
| 96 | #define INFINITE 3600 |
| 97 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 98 | #define SBI_MAGIC_ID 0x5342492B // magic ID ("SBI+") |
| 99 | #define SBH_MAGIC_ID 0x5342482A // magic ID ("SBH*") |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 100 | |
| 101 | #define INVALID_ID -1 |
| 102 | |
| 103 | #define TABLE_SIZE 10 |
| 104 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 105 | //--------------------------------------------------------------------------- |
| 106 | // Local types |
| 107 | //--------------------------------------------------------------------------- |
| 108 | |
| 109 | // This structure is the common header for the shared memory region used |
| 110 | // by all processes attached this shared memory. It includes common |
| 111 | // information to administrate/manage the shared buffer from a couple of |
| 112 | // separated processes (e.g. the refernce counter). This structure is |
| 113 | // located at the start of the shared memory region itself and exists |
| 114 | // consequently only one times per shared memory instance. |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 115 | typedef struct { |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 116 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 117 | unsigned long m_ulShMemSize; |
| 118 | unsigned long m_ulRefCount; |
| 119 | int m_iBufferId; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 120 | // int m_iUserSpaceMem; //0 for userspace mem !=0 kernelspace mem |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 121 | spinlock_t m_SpinlockBuffAccess; |
| 122 | BOOL m_fNewData; |
| 123 | BOOL m_fJobReady; |
| 124 | wait_queue_head_t m_WaitQueueNewData; |
| 125 | wait_queue_head_t m_WaitQueueJobReady; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 126 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 127 | #ifndef NDEBUG |
| 128 | unsigned long m_ulOwnerProcID; |
| 129 | #endif |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 130 | |
| 131 | } tShbMemHeader; |
| 132 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 133 | // This structure is the "external entry point" from a separate process |
| 134 | // to get access to a shared buffer. This structure includes all platform |
| 135 | // resp. target specific information to administrate/manage the shared |
| 136 | // buffer from a separate process. Every process attached to the shared |
| 137 | // buffer has its own runtime instance of this structure with its individual |
| 138 | // runtime data (e.g. the scope of an event handle is limitted to the |
| 139 | // owner process only). The structure member <m_pShbMemHeader> points |
| 140 | // to the (process specific) start address of the shared memory region |
| 141 | // itself. |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 142 | typedef struct { |
| 143 | unsigned long m_SbiMagicID; // magic ID ("SBI+") |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 144 | // void* m_pSharedMem; |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 145 | int m_tThreadNewDataId; |
| 146 | long m_lThreadNewDataNice; // nice value of the new data thread |
| 147 | int m_tThreadJobReadyId; |
| 148 | unsigned long m_ulFlagsBuffAccess; // d.k. moved from tShbMemHeader, because each |
| 149 | // process needs to store the interrupt flags separately |
| 150 | tSigHndlrNewData m_pfnSigHndlrNewData; |
| 151 | unsigned long m_ulTimeOutJobReady; |
| 152 | tSigHndlrJobReady m_pfnSigHndlrJobReady; |
| 153 | tShbMemHeader *m_pShbMemHeader; |
| 154 | int m_iThreadTermFlag; |
| 155 | struct completion m_CompletionNewData; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 156 | /* |
| 157 | struct semaphore *m_pSemBuffAccess; |
| 158 | struct semaphore *m_pSemNewData; |
| 159 | struct semaphore *m_pSemStopSignalingNewData; |
| 160 | struct semaphore *m_pSemJobReady; |
| 161 | */ |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 162 | #ifndef NDEBUG |
| 163 | unsigned long m_ulThreadIDNewData; |
| 164 | unsigned long m_ulThreadIDJobReady; |
| 165 | #endif |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 166 | } tShbMemInst; |
| 167 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 168 | //--------------------------------------------------------------------------- |
| 169 | // Prototypes of internal functions |
| 170 | //--------------------------------------------------------------------------- |
| 171 | |
| 172 | //tShbMemInst* ShbIpcGetShbMemInst (tShbInstance pShbInstance_p); |
| 173 | //tShbMemHeader* ShbIpcGetShbMemHeader (tShbMemInst* pShbMemInst_p); |
| 174 | |
| 175 | //--------------------------------------------------------------------------- |
| 176 | // Get pointer to process local information structure |
| 177 | //--------------------------------------------------------------------------- |
| 178 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 179 | static inline tShbMemInst *ShbIpcGetShbMemInst(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 180 | { |
| 181 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 182 | tShbMemInst *pShbMemInst; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 183 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 184 | pShbMemInst = (tShbMemInst *) pShbInstance_p; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 185 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 186 | return (pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 187 | |
| 188 | } |
| 189 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 190 | //--------------------------------------------------------------------------- |
| 191 | // Get pointer to shared memory header |
| 192 | //--------------------------------------------------------------------------- |
| 193 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 194 | static inline tShbMemHeader *ShbIpcGetShbMemHeader(tShbMemInst * pShbMemInst_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 195 | { |
| 196 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 197 | tShbMemHeader *pShbMemHeader; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 198 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 199 | pShbMemHeader = pShbMemInst_p->m_pShbMemHeader; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 200 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 201 | return (pShbMemHeader); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 202 | |
| 203 | } |
| 204 | |
| 205 | // Get pointer to process local information structure |
| 206 | //#define ShbIpcGetShbMemInst(pShbInstance_p) ((tShbMemInst*)pShbInstance_p) |
| 207 | |
| 208 | // Get pointer to shared memory header |
| 209 | //#define ShbIpcGetShbMemHeader(pShbMemInst_p) (pShbMemInst_p->m_pShbMemHeader) |
| 210 | |
| 211 | // not inlined internal functions |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 212 | int ShbIpcThreadSignalNewData(void *pvThreadParam_p); |
| 213 | int ShbIpcThreadSignalJobReady(void *pvThreadParam_p); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 214 | #endif |
| 215 | |
| 216 | //--------------------------------------------------------------------------- |
| 217 | // modul globale vars |
| 218 | //--------------------------------------------------------------------------- |
| 219 | |
| 220 | #if !defined(SHBIPC_INLINE_ENABLED) |
| 221 | struct sShbMemTable *psMemTableElementFirst_g; |
| 222 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 223 | static void *ShbIpcAllocPrivateMem(unsigned long ulMemSize_p); |
| 224 | static int ShbIpcFindListElement(int iBufferId, |
| 225 | struct sShbMemTable |
| 226 | **ppsReturnMemTableElement); |
| 227 | static void ShbIpcAppendListElement(struct sShbMemTable *sNewMemTableElement); |
| 228 | static void ShbIpcDeleteListElement(int iBufferId); |
| 229 | static void ShbIpcCrc32GenTable(unsigned long aulCrcTable[256]); |
| 230 | static unsigned long ShbIpcCrc32GetCrc(const char *pcString, |
| 231 | unsigned long aulCrcTable[256]); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 232 | |
| 233 | #endif |
| 234 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 235 | //=========================================================================// |
| 236 | // // |
| 237 | // P U B L I C F U N C T I O N S // |
| 238 | // // |
| 239 | //=========================================================================// |
| 240 | |
| 241 | #if !defined(SHBIPC_INLINE_ENABLED) |
| 242 | // not inlined external functions |
| 243 | |
| 244 | //--------------------------------------------------------------------------- |
| 245 | // Initialize IPC for Shared Buffer Module |
| 246 | //--------------------------------------------------------------------------- |
| 247 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 248 | tShbError ShbIpcInit(void) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 249 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 250 | psMemTableElementFirst_g = NULL; |
| 251 | return (kShbOk); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 252 | |
| 253 | } |
| 254 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 255 | //--------------------------------------------------------------------------- |
| 256 | // Deinitialize IPC for Shared Buffer Module |
| 257 | //--------------------------------------------------------------------------- |
| 258 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 259 | tShbError ShbIpcExit(void) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 260 | { |
| 261 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 262 | return (kShbOk); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 263 | |
| 264 | } |
| 265 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 266 | //--------------------------------------------------------------------------- |
| 267 | // Allocate Shared Buffer |
| 268 | //--------------------------------------------------------------------------- |
| 269 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 270 | tShbError ShbIpcAllocBuffer(unsigned long ulBufferSize_p, |
| 271 | const char *pszBufferID_p, |
| 272 | tShbInstance * ppShbInstance_p, |
| 273 | unsigned int *pfShbNewCreated_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 274 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 275 | tShbError ShbError; |
| 276 | int iBufferId = 0; |
| 277 | unsigned long ulCrc32 = 0; |
| 278 | unsigned int uiFirstProcess = 0; |
| 279 | unsigned long ulShMemSize; |
| 280 | tShbMemHeader *pShbMemHeader; |
| 281 | tShbMemInst *pShbMemInst = NULL; |
| 282 | tShbInstance pShbInstance; |
| 283 | unsigned int fShMemNewCreated = FALSE; |
| 284 | void *pSharedMem = NULL; |
| 285 | unsigned long aulCrcTable[256]; |
| 286 | struct sShbMemTable *psMemTableElement; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 287 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 288 | DEBUG_LVL_29_TRACE0("ShbIpcAllocBuffer \n"); |
| 289 | ulShMemSize = ulBufferSize_p + sizeof(tShbMemHeader); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 290 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 291 | //create Buffer ID |
| 292 | ShbIpcCrc32GenTable(aulCrcTable); |
| 293 | ulCrc32 = ShbIpcCrc32GetCrc(pszBufferID_p, aulCrcTable); |
| 294 | iBufferId = ulCrc32; |
| 295 | DEBUG_LVL_29_TRACE2 |
| 296 | ("ShbIpcAllocBuffer BufferSize:%d sizeof(tShb..):%d\n", |
| 297 | ulBufferSize_p, sizeof(tShbMemHeader)); |
| 298 | DEBUG_LVL_29_TRACE2("ShbIpcAllocBuffer BufferId:%d MemSize:%d\n", |
| 299 | iBufferId, ulShMemSize); |
| 300 | //--------------------------------------------------------------- |
| 301 | // (1) open an existing or create a new shared memory |
| 302 | //--------------------------------------------------------------- |
| 303 | //test if buffer already exists |
| 304 | if (ShbIpcFindListElement(iBufferId, &psMemTableElement) == 0) { |
| 305 | //Buffer already exists |
| 306 | fShMemNewCreated = FALSE; |
| 307 | pSharedMem = psMemTableElement->m_pBuffer; |
| 308 | DEBUG_LVL_29_TRACE1 |
| 309 | ("ShbIpcAllocBuffer attach Buffer at:%p Id:%d\n", |
| 310 | pSharedMem); |
| 311 | uiFirstProcess = 1; |
| 312 | } else { |
| 313 | //create new Buffer |
| 314 | fShMemNewCreated = TRUE; |
| 315 | uiFirstProcess = 0; |
| 316 | pSharedMem = kmalloc(ulShMemSize, GFP_KERNEL); |
| 317 | DEBUG_LVL_29_TRACE2 |
| 318 | ("ShbIpcAllocBuffer Create New Buffer at:%p Id:%d\n", |
| 319 | pSharedMem, iBufferId); |
| 320 | if (pSharedMem == NULL) { |
| 321 | //unable to create mem |
| 322 | ShbError = kShbOutOfMem; |
| 323 | goto Exit; |
| 324 | } |
| 325 | DEBUG_LVL_29_TRACE0("ShbIpcAllocBuffer create semas\n"); |
| 326 | // append Element to Mem Table |
| 327 | psMemTableElement = |
| 328 | kmalloc(sizeof(struct sShbMemTable), GFP_KERNEL); |
| 329 | psMemTableElement->m_iBufferId = iBufferId; |
| 330 | psMemTableElement->m_pBuffer = pSharedMem; |
| 331 | psMemTableElement->m_psNextMemTableElement = NULL; |
| 332 | ShbIpcAppendListElement(psMemTableElement); |
| 333 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 334 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 335 | DEBUG_LVL_29_TRACE0("ShbIpcAllocBuffer update header\n"); |
| 336 | //update header |
| 337 | pShbMemHeader = (tShbMemHeader *) pSharedMem; |
| 338 | DEBUG_LVL_29_TRACE1 |
| 339 | ("ShbIpcAllocBuffer 0 pShbMemHeader->m_ulShMemSize: %d\n", |
| 340 | pShbMemHeader->m_ulShMemSize); |
| 341 | // allocate a memory block from process specific mempool to save |
| 342 | // process local information to administrate/manage the shared buffer |
| 343 | DEBUG_LVL_29_TRACE0("ShbIpcAllocBuffer alloc private mem\n"); |
| 344 | pShbMemInst = |
| 345 | (tShbMemInst *) ShbIpcAllocPrivateMem(sizeof(tShbMemInst)); |
| 346 | if (pShbMemInst == NULL) { |
| 347 | ShbError = kShbOutOfMem; |
| 348 | goto Exit; |
| 349 | } |
| 350 | // reset complete header to default values |
| 351 | //pShbMemInst->m_SbiMagicID = SBI_MAGIC_ID; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 352 | // pShbMemInst->m_pSharedMem = pSharedMem; |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 353 | pShbMemInst->m_tThreadNewDataId = INVALID_ID; |
| 354 | pShbMemInst->m_tThreadJobReadyId = INVALID_ID; |
| 355 | pShbMemInst->m_pfnSigHndlrNewData = NULL; |
| 356 | pShbMemInst->m_ulTimeOutJobReady = 0; |
| 357 | pShbMemInst->m_pfnSigHndlrJobReady = NULL; |
| 358 | pShbMemInst->m_pShbMemHeader = pShbMemHeader; |
| 359 | pShbMemInst->m_iThreadTermFlag = 0; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 360 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 361 | // initialize completion etc. |
| 362 | init_completion(&pShbMemInst->m_CompletionNewData); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 363 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 364 | ShbError = kShbOk; |
| 365 | if (fShMemNewCreated) { |
| 366 | // this process was the first who wanted to use the shared memory, |
| 367 | // so a new shared memory was created |
| 368 | // -> setup new header information inside the shared memory region |
| 369 | // itself |
| 370 | pShbMemHeader->m_ulShMemSize = ulShMemSize; |
| 371 | pShbMemHeader->m_ulRefCount = 1; |
| 372 | pShbMemHeader->m_iBufferId = iBufferId; |
| 373 | // initialize spinlock |
| 374 | spin_lock_init(&pShbMemHeader->m_SpinlockBuffAccess); |
| 375 | // initialize wait queues |
| 376 | init_waitqueue_head(&pShbMemHeader->m_WaitQueueNewData); |
| 377 | init_waitqueue_head(&pShbMemHeader->m_WaitQueueJobReady); |
| 378 | } else { |
| 379 | // any other process has created the shared memory and this |
| 380 | // process only has to attach to it |
| 381 | // -> check and update existing header information inside the |
| 382 | // shared memory region itself |
| 383 | if (pShbMemHeader->m_ulShMemSize != ulShMemSize) { |
| 384 | ShbError = kShbOpenMismatch; |
| 385 | goto Exit; |
| 386 | } |
| 387 | pShbMemHeader->m_ulRefCount++; |
| 388 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 389 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 390 | Exit: |
| 391 | pShbInstance = (tShbInstance *) pShbMemInst; |
| 392 | *pfShbNewCreated_p = fShMemNewCreated; |
| 393 | *ppShbInstance_p = pShbInstance; |
| 394 | return (ShbError); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 395 | |
| 396 | } |
| 397 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 398 | //--------------------------------------------------------------------------- |
| 399 | // Release Shared Buffer |
| 400 | //--------------------------------------------------------------------------- |
| 401 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 402 | tShbError ShbIpcReleaseBuffer(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 403 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 404 | tShbMemInst *pShbMemInst; |
| 405 | tShbMemHeader *pShbMemHeader; |
| 406 | tShbError ShbError; |
| 407 | tShbError ShbError2; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 408 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 409 | DEBUG_LVL_26_TRACE1("ShbIpcReleaseBuffer(%p)\n", pShbInstance_p); |
| 410 | if (pShbInstance_p == NULL) { |
| 411 | return (kShbOk); |
| 412 | } |
| 413 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance_p); |
| 414 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 415 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 416 | // stop threads in any case, because they are bound to that specific instance |
| 417 | ShbError2 = ShbIpcStopSignalingNewData(pShbInstance_p); |
| 418 | // d.k.: Whats up with JobReady thread? |
| 419 | // Just wake it up, but without setting the semaphore variable |
| 420 | wake_up_interruptible(&pShbMemHeader->m_WaitQueueJobReady); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 421 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 422 | if (!--pShbMemHeader->m_ulRefCount) { |
| 423 | ShbError = kShbOk; |
| 424 | // delete mem table element |
| 425 | ShbIpcDeleteListElement(pShbMemHeader->m_iBufferId); |
| 426 | // delete shared mem |
| 427 | kfree(pShbMemInst->m_pShbMemHeader); |
| 428 | } else { |
| 429 | ShbError = kShbMemUsedByOtherProcs; |
| 430 | } |
| 431 | //delete privat mem |
| 432 | kfree(pShbMemInst); |
| 433 | return (ShbError); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 434 | } |
| 435 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 436 | #endif // !defined(SHBIPC_INLINE_ENABLED) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 437 | |
| 438 | #if (!defined(SHBIPC_INLINED)) || defined(SHBIPC_INLINE_ENABLED) |
| 439 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 440 | //--------------------------------------------------------------------------- |
| 441 | // Enter atomic section for Shared Buffer access |
| 442 | //--------------------------------------------------------------------------- |
| 443 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 444 | INLINE_FUNCTION tShbError ShbIpcEnterAtomicSection(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 445 | { |
| 446 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 447 | tShbMemInst *pShbMemInst; |
| 448 | tShbMemHeader *pShbMemHeader; |
| 449 | tShbError ShbError = kShbOk; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 450 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 451 | if (pShbInstance_p == NULL) { |
| 452 | ShbError = kShbInvalidArg; |
| 453 | goto Exit; |
| 454 | } |
| 455 | DEBUG_LVL_29_TRACE0("enter atomic\n"); |
| 456 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance_p); |
| 457 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 458 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 459 | // lock interrupts |
| 460 | spin_lock_irqsave(&pShbMemHeader->m_SpinlockBuffAccess, |
| 461 | pShbMemInst->m_ulFlagsBuffAccess); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 462 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 463 | Exit: |
| 464 | return ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 465 | |
| 466 | } |
| 467 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 468 | //--------------------------------------------------------------------------- |
| 469 | // Leave atomic section for Shared Buffer access |
| 470 | //--------------------------------------------------------------------------- |
| 471 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 472 | INLINE_FUNCTION tShbError ShbIpcLeaveAtomicSection(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 473 | { |
| 474 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 475 | tShbMemInst *pShbMemInst; |
| 476 | tShbMemHeader *pShbMemHeader; |
| 477 | tShbError ShbError = kShbOk; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 478 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 479 | if (pShbInstance_p == NULL) { |
| 480 | ShbError = kShbInvalidArg; |
| 481 | goto Exit; |
| 482 | } |
| 483 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance_p); |
| 484 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
| 485 | // unlock interrupts |
| 486 | spin_unlock_irqrestore(&pShbMemHeader->m_SpinlockBuffAccess, |
| 487 | pShbMemInst->m_ulFlagsBuffAccess); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 488 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 489 | Exit: |
| 490 | DEBUG_LVL_29_TRACE0("Leave Atomic \n"); |
| 491 | return ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 492 | |
| 493 | } |
| 494 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 495 | //--------------------------------------------------------------------------- |
| 496 | // Start signaling of new data (called from reading process) |
| 497 | //--------------------------------------------------------------------------- |
| 498 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 499 | INLINE_FUNCTION tShbError ShbIpcStartSignalingNewData(tShbInstance |
| 500 | pShbInstance_p, |
| 501 | tSigHndlrNewData |
| 502 | pfnSignalHandlerNewData_p, |
| 503 | tShbPriority |
| 504 | ShbPriority_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 505 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 506 | tShbMemInst *pShbMemInst; |
| 507 | tShbMemHeader *pShbMemHeader; |
| 508 | tShbError ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 509 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 510 | DEBUG_LVL_29_TRACE0("------->ShbIpcStartSignalingNewData\n"); |
| 511 | if ((pShbInstance_p == NULL) || (pfnSignalHandlerNewData_p == NULL)) { |
| 512 | return (kShbInvalidArg); |
| 513 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 514 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 515 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance_p); |
| 516 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
| 517 | ShbError = kShbOk; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 518 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 519 | if ((pShbMemInst->m_tThreadNewDataId != INVALID_ID) |
| 520 | || (pShbMemInst->m_pfnSigHndlrNewData != NULL)) { |
| 521 | ShbError = kShbAlreadySignaling; |
| 522 | goto Exit; |
| 523 | } |
| 524 | DEBUG_LVL_26_TRACE2 |
| 525 | ("ShbIpcStartSignalingNewData(%p) m_pfnSigHndlrNewData = %p\n", |
| 526 | pShbInstance_p, pfnSignalHandlerNewData_p); |
| 527 | pShbMemInst->m_pfnSigHndlrNewData = pfnSignalHandlerNewData_p; |
| 528 | pShbMemHeader->m_fNewData = FALSE; |
| 529 | pShbMemInst->m_iThreadTermFlag = 0; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 530 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 531 | switch (ShbPriority_p) { |
| 532 | case kShbPriorityLow: |
| 533 | pShbMemInst->m_lThreadNewDataNice = -2; |
| 534 | break; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 535 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 536 | case kShbPriorityNormal: |
| 537 | pShbMemInst->m_lThreadNewDataNice = -9; |
| 538 | break; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 539 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 540 | case kshbPriorityHigh: |
| 541 | pShbMemInst->m_lThreadNewDataNice = -20; |
| 542 | break; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 543 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 544 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 545 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 546 | //create thread for signalling new data |
| 547 | pShbMemInst->m_tThreadNewDataId = |
| 548 | kernel_thread(ShbIpcThreadSignalNewData, pShbInstance_p, |
| 549 | CLONE_KERNEL); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 550 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 551 | Exit: |
| 552 | return ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 553 | |
| 554 | } |
| 555 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 556 | //--------------------------------------------------------------------------- |
| 557 | // Stop signaling of new data (called from reading process) |
| 558 | //--------------------------------------------------------------------------- |
| 559 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 560 | INLINE_FUNCTION tShbError ShbIpcStopSignalingNewData(tShbInstance |
| 561 | pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 562 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 563 | tShbMemInst *pShbMemInst; |
| 564 | tShbMemHeader *pShbMemHeader; |
| 565 | tShbError ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 566 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 567 | DEBUG_LVL_29_TRACE0("------->ShbIpcStopSignalingNewData\n"); |
| 568 | if (pShbInstance_p == NULL) { |
| 569 | return (kShbInvalidArg); |
| 570 | } |
| 571 | ShbError = kShbOk; |
| 572 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance_p); |
| 573 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 574 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 575 | DEBUG_LVL_26_TRACE2 |
| 576 | ("ShbIpcStopSignalingNewData(%p) pfnSignHndlrNewData=%p\n", |
| 577 | pShbInstance_p, pShbMemInst->m_pfnSigHndlrNewData); |
| 578 | if (pShbMemInst->m_pfnSigHndlrNewData != NULL) { // signal handler was set before |
| 579 | int iErr; |
| 580 | //set termination flag in mem header |
| 581 | pShbMemInst->m_iThreadTermFlag = 1; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 582 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 583 | // check if thread is still running at all by sending the null-signal to this thread |
| 584 | /* iErr = kill_proc(pShbMemInst->m_tThreadNewDataId, 0, 1); */ |
| 585 | iErr = send_sig(0, pShbMemInst->m_tThreadNewDataId, 1); |
| 586 | if (iErr == 0) { |
| 587 | // wake up thread, because it is still running |
| 588 | wake_up_interruptible(&pShbMemHeader-> |
| 589 | m_WaitQueueNewData); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 590 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 591 | //wait for termination of thread |
| 592 | wait_for_completion(&pShbMemInst->m_CompletionNewData); |
| 593 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 594 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 595 | pShbMemInst->m_pfnSigHndlrNewData = NULL; |
| 596 | pShbMemInst->m_tThreadNewDataId = INVALID_ID; |
| 597 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 598 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 599 | return ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 600 | |
| 601 | } |
| 602 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 603 | //--------------------------------------------------------------------------- |
| 604 | // Signal new data (called from writing process) |
| 605 | //--------------------------------------------------------------------------- |
| 606 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 607 | INLINE_FUNCTION tShbError ShbIpcSignalNewData(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 608 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 609 | tShbMemHeader *pShbMemHeader; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 610 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 611 | if (pShbInstance_p == NULL) { |
| 612 | return (kShbInvalidArg); |
| 613 | } |
| 614 | pShbMemHeader = |
| 615 | ShbIpcGetShbMemHeader(ShbIpcGetShbMemInst(pShbInstance_p)); |
| 616 | //set semaphore |
| 617 | pShbMemHeader->m_fNewData = TRUE; |
| 618 | DEBUG_LVL_29_TRACE0("ShbIpcSignalNewData set Sem -> New Data\n"); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 619 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 620 | wake_up_interruptible(&pShbMemHeader->m_WaitQueueNewData); |
| 621 | return (kShbOk); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 624 | //--------------------------------------------------------------------------- |
| 625 | // Start signaling for job ready (called from waiting process) |
| 626 | //--------------------------------------------------------------------------- |
| 627 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 628 | INLINE_FUNCTION tShbError ShbIpcStartSignalingJobReady(tShbInstance |
| 629 | pShbInstance_p, |
| 630 | unsigned long |
| 631 | ulTimeOut_p, |
| 632 | tSigHndlrJobReady |
| 633 | pfnSignalHandlerJobReady_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 634 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 635 | tShbMemInst *pShbMemInst; |
| 636 | tShbMemHeader *pShbMemHeader; |
| 637 | tShbError ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 638 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 639 | if ((pShbInstance_p == NULL) || (pfnSignalHandlerJobReady_p == NULL)) { |
| 640 | return (kShbInvalidArg); |
| 641 | } |
| 642 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance_p); |
| 643 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 644 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 645 | ShbError = kShbOk; |
| 646 | if ((pShbMemInst->m_tThreadJobReadyId != INVALID_ID) |
| 647 | || (pShbMemInst->m_pfnSigHndlrJobReady != NULL)) { |
| 648 | ShbError = kShbAlreadySignaling; |
| 649 | goto Exit; |
| 650 | } |
| 651 | pShbMemInst->m_ulTimeOutJobReady = ulTimeOut_p; |
| 652 | pShbMemInst->m_pfnSigHndlrJobReady = pfnSignalHandlerJobReady_p; |
| 653 | pShbMemHeader->m_fJobReady = FALSE; |
| 654 | //create thread for signalling new data |
| 655 | pShbMemInst->m_tThreadJobReadyId = |
| 656 | kernel_thread(ShbIpcThreadSignalJobReady, pShbInstance_p, |
| 657 | CLONE_KERNEL); |
| 658 | Exit: |
| 659 | return ShbError; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 660 | } |
| 661 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 662 | //--------------------------------------------------------------------------- |
| 663 | // Signal job ready (called from executing process) |
| 664 | //--------------------------------------------------------------------------- |
| 665 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 666 | INLINE_FUNCTION tShbError ShbIpcSignalJobReady(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 667 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 668 | tShbMemHeader *pShbMemHeader; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 669 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 670 | DEBUG_LVL_29_TRACE0("ShbIpcSignalJobReady\n"); |
| 671 | if (pShbInstance_p == NULL) { |
| 672 | return (kShbInvalidArg); |
| 673 | } |
| 674 | pShbMemHeader = |
| 675 | ShbIpcGetShbMemHeader(ShbIpcGetShbMemInst(pShbInstance_p)); |
| 676 | //set semaphore |
| 677 | pShbMemHeader->m_fJobReady = TRUE; |
| 678 | DEBUG_LVL_29_TRACE0("ShbIpcSignalJobReady set Sem -> Job Ready \n"); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 679 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 680 | wake_up_interruptible(&pShbMemHeader->m_WaitQueueJobReady); |
| 681 | return (kShbOk); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 682 | } |
| 683 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 684 | //--------------------------------------------------------------------------- |
| 685 | // Get pointer to common used share memory area |
| 686 | //--------------------------------------------------------------------------- |
| 687 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 688 | INLINE_FUNCTION void *ShbIpcGetShMemPtr(tShbInstance pShbInstance_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 689 | { |
| 690 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 691 | tShbMemHeader *pShbMemHeader; |
| 692 | void *pShbShMemPtr; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 693 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 694 | pShbMemHeader = |
| 695 | ShbIpcGetShbMemHeader(ShbIpcGetShbMemInst(pShbInstance_p)); |
| 696 | if (pShbMemHeader != NULL) { |
| 697 | pShbShMemPtr = (BYTE *) pShbMemHeader + sizeof(tShbMemHeader); |
| 698 | } else { |
| 699 | pShbShMemPtr = NULL; |
| 700 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 701 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 702 | return (pShbShMemPtr); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 703 | |
| 704 | } |
| 705 | |
| 706 | #endif |
| 707 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 708 | //=========================================================================// |
| 709 | // // |
| 710 | // P R I V A T E F U N C T I O N S // |
| 711 | // // |
| 712 | //=========================================================================// |
| 713 | |
| 714 | #if !defined(SHBIPC_INLINE_ENABLED) |
| 715 | |
| 716 | //--------------------------------------------------------------------------- |
| 717 | // Get pointer to process local information structure |
| 718 | //--------------------------------------------------------------------------- |
| 719 | |
| 720 | /*tShbMemInst* ShbIpcGetShbMemInst ( |
| 721 | tShbInstance pShbInstance_p) |
| 722 | { |
| 723 | |
| 724 | tShbMemInst* pShbMemInst; |
| 725 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 726 | pShbMemInst = (tShbMemInst*)pShbInstance_p; |
| 727 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 728 | return (pShbMemInst); |
| 729 | |
| 730 | } |
| 731 | */ |
| 732 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 733 | //--------------------------------------------------------------------------- |
| 734 | // Get pointer to shared memory header |
| 735 | //--------------------------------------------------------------------------- |
| 736 | |
| 737 | /*tShbMemHeader* ShbIpcGetShbMemHeader ( |
| 738 | tShbMemInst* pShbMemInst_p) |
| 739 | { |
| 740 | |
| 741 | tShbMemHeader* pShbMemHeader; |
| 742 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 743 | pShbMemHeader = pShbMemInst_p->m_pShbMemHeader; |
| 744 | |
| 745 | return (pShbMemHeader); |
| 746 | |
| 747 | } |
| 748 | */ |
| 749 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 750 | //--------------------------------------------------------------------------- |
| 751 | // Allocate a memory block from process specific mempool |
| 752 | //--------------------------------------------------------------------------- |
| 753 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 754 | static void *ShbIpcAllocPrivateMem(unsigned long ulMemSize_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 755 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 756 | tShbError ShbError; |
| 757 | void *pMem; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 758 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 759 | DEBUG_LVL_29_TRACE0("ShbIpcAllocPrivateMem \n"); |
| 760 | //get private mem |
| 761 | pMem = kmalloc(ulMemSize_p, GFP_KERNEL); |
| 762 | if (pMem == NULL) { |
| 763 | //unable to create mem |
| 764 | ShbError = kShbOutOfMem; |
| 765 | goto Exit; |
| 766 | } |
| 767 | Exit: |
| 768 | return (pMem); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 769 | |
| 770 | } |
| 771 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 772 | //--------------------------------------------------------------------------- |
| 773 | // Thread for new data signaling |
| 774 | //--------------------------------------------------------------------------- |
| 775 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 776 | int ShbIpcThreadSignalNewData(void *pvThreadParam_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 777 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 778 | tShbInstance pShbInstance; |
| 779 | tShbMemInst *pShbMemInst; |
| 780 | tShbMemHeader *pShbMemHeader; |
| 781 | int iRetVal = -1; |
| 782 | int fCallAgain; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 783 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 784 | daemonize("ShbND%p", pvThreadParam_p); |
| 785 | allow_signal(SIGTERM); |
| 786 | pShbInstance = (tShbMemInst *) pvThreadParam_p; |
| 787 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance); |
| 788 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 789 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 790 | DEBUG_LVL_26_TRACE1("ShbIpcThreadSignalNewData(%p)\n", pvThreadParam_p); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 791 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 792 | set_user_nice(current, pShbMemInst->m_lThreadNewDataNice); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 793 | |
| 794 | // DEBUG_LVL_29_TRACE1("ShbIpcThreadSignalNewData wait for New Data Sem %p\n",pShbMemInst->m_pSemNewData); |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 795 | do { |
| 796 | iRetVal = |
| 797 | wait_event_interruptible(pShbMemHeader->m_WaitQueueNewData, |
| 798 | (pShbMemInst->m_iThreadTermFlag != |
| 799 | 0) |
| 800 | || (pShbMemHeader->m_fNewData != |
| 801 | FALSE)); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 802 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 803 | if (iRetVal != 0) { // signal pending |
| 804 | break; |
| 805 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 806 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 807 | if (pShbMemHeader->m_fNewData != FALSE) { |
| 808 | pShbMemHeader->m_fNewData = FALSE; |
| 809 | do { |
| 810 | fCallAgain = |
| 811 | pShbMemInst-> |
| 812 | m_pfnSigHndlrNewData(pShbInstance); |
| 813 | // call scheduler, which will execute any task with higher priority |
| 814 | schedule(); |
| 815 | } while (fCallAgain != FALSE); |
| 816 | } |
| 817 | } while (pShbMemInst->m_iThreadTermFlag == 0); |
| 818 | DEBUG_LVL_29_TRACE0("ShbIpcThreadSignalNewData terminated \n"); |
| 819 | //set thread completed |
| 820 | complete_and_exit(&pShbMemInst->m_CompletionNewData, 0); |
| 821 | return 0; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 822 | } |
| 823 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 824 | //--------------------------------------------------------------------------- |
| 825 | // Thread for new data Job Ready signaling |
| 826 | //--------------------------------------------------------------------------- |
| 827 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 828 | int ShbIpcThreadSignalJobReady(void *pvThreadParam_p) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 829 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 830 | tShbInstance pShbInstance; |
| 831 | tShbMemInst *pShbMemInst; |
| 832 | tShbMemHeader *pShbMemHeader; |
| 833 | long lTimeOut; |
| 834 | int iRetVal = -1; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 835 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 836 | daemonize("ShbJR%p", pvThreadParam_p); |
| 837 | allow_signal(SIGTERM); |
| 838 | pShbInstance = (tShbMemInst *) pvThreadParam_p; |
| 839 | pShbMemInst = ShbIpcGetShbMemInst(pShbInstance); |
| 840 | pShbMemHeader = ShbIpcGetShbMemHeader(pShbMemInst); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 841 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 842 | DEBUG_LVL_29_TRACE0 |
| 843 | ("ShbIpcThreadSignalJobReady wait for job ready Sem\n"); |
| 844 | if (pShbMemInst->m_ulTimeOutJobReady != 0) { |
| 845 | lTimeOut = (long)pShbMemInst->m_ulTimeOutJobReady; |
| 846 | //wait for job ready semaphore |
| 847 | iRetVal = |
| 848 | wait_event_interruptible_timeout(pShbMemHeader-> |
| 849 | m_WaitQueueJobReady, |
| 850 | (pShbMemHeader-> |
| 851 | m_fJobReady != FALSE), |
| 852 | lTimeOut); |
| 853 | } else { |
| 854 | //wait for job ready semaphore |
| 855 | iRetVal = |
| 856 | wait_event_interruptible(pShbMemHeader->m_WaitQueueJobReady, |
| 857 | (pShbMemHeader->m_fJobReady != |
| 858 | FALSE)); |
| 859 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 860 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 861 | if (pShbMemInst->m_pfnSigHndlrJobReady != NULL) { |
| 862 | //call Handler |
| 863 | pShbMemInst->m_pfnSigHndlrJobReady(pShbInstance, |
| 864 | !pShbMemHeader->m_fJobReady); |
| 865 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 866 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 867 | pShbMemInst->m_pfnSigHndlrJobReady = NULL; |
| 868 | return 0; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 869 | } |
| 870 | |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 871 | //Build the crc table |
| 872 | static void ShbIpcCrc32GenTable(unsigned long aulCrcTable[256]) |
| 873 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 874 | unsigned long ulCrc, ulPoly; |
| 875 | int iIndexI, iIndexJ; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 876 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 877 | ulPoly = 0xEDB88320L; |
| 878 | for (iIndexI = 0; iIndexI < 256; iIndexI++) { |
| 879 | ulCrc = iIndexI; |
| 880 | for (iIndexJ = 8; iIndexJ > 0; iIndexJ--) { |
| 881 | if (ulCrc & 1) { |
| 882 | ulCrc = (ulCrc >> 1) ^ ulPoly; |
| 883 | } else { |
| 884 | ulCrc >>= 1; |
| 885 | } |
| 886 | } |
| 887 | aulCrcTable[iIndexI] = ulCrc; |
| 888 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 889 | } |
| 890 | |
| 891 | //Calculate the crc value |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 892 | static unsigned long ShbIpcCrc32GetCrc(const char *pcString, |
| 893 | unsigned long aulCrcTable[256]) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 894 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 895 | unsigned long ulCrc; |
| 896 | int iIndex; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 897 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 898 | ulCrc = 0xFFFFFFFF; |
| 899 | for (iIndex = 0; iIndex < strlen(pcString); iIndex++) { |
| 900 | ulCrc = |
| 901 | ((ulCrc >> 8) & 0x00FFFFFF) ^ |
| 902 | aulCrcTable[(ulCrc ^ pcString[iIndex]) & 0xFF]; |
| 903 | } |
| 904 | return (ulCrc ^ 0xFFFFFFFF); |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 905 | |
| 906 | } |
| 907 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 908 | static void ShbIpcAppendListElement(struct sShbMemTable *psNewMemTableElement) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 909 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 910 | struct sShbMemTable *psMemTableElement = psMemTableElementFirst_g; |
| 911 | psNewMemTableElement->m_psNextMemTableElement = NULL; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 912 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 913 | if (psMemTableElementFirst_g != NULL) { /* sind Elemente vorhanden */ |
| 914 | while (psMemTableElement->m_psNextMemTableElement != NULL) { /* suche das letzte Element */ |
| 915 | psMemTableElement = |
| 916 | psMemTableElement->m_psNextMemTableElement; |
| 917 | } |
| 918 | psMemTableElement->m_psNextMemTableElement = psNewMemTableElement; /* Haenge das Element hinten an */ |
| 919 | } else { /* wenn die liste leer ist, bin ich das erste Element */ |
| 920 | psMemTableElementFirst_g = psNewMemTableElement; |
| 921 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 922 | } |
| 923 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 924 | static int ShbIpcFindListElement(int iBufferId, |
| 925 | struct sShbMemTable **ppsReturnMemTableElement) |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 926 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 927 | struct sShbMemTable *psMemTableElement = psMemTableElementFirst_g; |
| 928 | while (psMemTableElement != NULL) { |
| 929 | if (psMemTableElement->m_iBufferId == iBufferId) { |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 930 | //printk("ShbIpcFindListElement Buffer at:%p Id:%d\n",psMemTableElement->m_pBuffer,psMemTableElement->m_iBufferId); |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 931 | *ppsReturnMemTableElement = psMemTableElement; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 932 | //printk("ShbIpcFindListElement Buffer at:%p Id:%d\n",(*ppsReturnMemTableElement)->m_pBuffer,(*ppsReturnMemTableElement)->m_iBufferId); |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 933 | return 0; |
| 934 | } |
| 935 | psMemTableElement = psMemTableElement->m_psNextMemTableElement; |
| 936 | } |
| 937 | return -1; |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | static void ShbIpcDeleteListElement(int iBufferId) |
| 941 | { |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 942 | struct sShbMemTable *psMemTableElement = psMemTableElementFirst_g; |
| 943 | struct sShbMemTable *psMemTableElementOld = psMemTableElementFirst_g; |
| 944 | if (psMemTableElement != NULL) { |
| 945 | while ((psMemTableElement != NULL) |
| 946 | && (psMemTableElement->m_iBufferId != iBufferId)) { |
| 947 | psMemTableElementOld = psMemTableElement; |
| 948 | psMemTableElement = |
| 949 | psMemTableElement->m_psNextMemTableElement; |
| 950 | } |
| 951 | if (psMemTableElement != NULL) { |
| 952 | if (psMemTableElement != psMemTableElementFirst_g) { |
| 953 | psMemTableElementOld->m_psNextMemTableElement = |
| 954 | psMemTableElement->m_psNextMemTableElement; |
| 955 | kfree(psMemTableElement); |
| 956 | } else { |
| 957 | kfree(psMemTableElement); |
| 958 | psMemTableElementFirst_g = NULL; |
| 959 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 960 | |
Greg Kroah-Hartman | 833dfbe | 2008-12-19 17:11:52 -0800 | [diff] [blame] | 961 | } |
| 962 | } |
Daniel Krueger | 9d7164c | 2008-12-19 11:41:57 -0800 | [diff] [blame] | 963 | |
| 964 | } |
| 965 | |
| 966 | #endif |