3771   winShmNode *pShmNode;      /* The underlying winShmNode object */  member
3892 static int winLockSharedMemory(winShmNode *pShmNode){  argument
3893   int rc = winShmSystemLock(pShmNode, WINSHM_WRLCK, WIN_SHM_DMS, 1);
3896     if( pShmNode->isReadonly ){
3897       pShmNode->isUnlocked = 1;
3898       winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
3900     }else if( winTruncate((sqlite3_file*)&pShmNode->hFile, 0) ){
3901       winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
3903                          "winLockSharedMemory", pShmNode->zFilename);
3908     winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
3911   return winShmSystemLock(pShmNode, WINSHM_RDLCK, WIN_SHM_DMS, 1);
3923   winShmNode *pShmNode = 0;          /* The underlying mmapped file */  local
3936   pNew = sqlite3MallocZero( sizeof(*pShmNode) + nName + 17 );
3949   for(pShmNode = winShmNodeList; pShmNode; pShmNode=pShmNode->pNext){
3953     if( sqlite3StrICmp(pShmNode->zFilename, pNew->zFilename)==0 ) break;
3955   if( pShmNode ){
3961     pShmNode = pNew;
3963     ((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
3964     pShmNode->pNext = winShmNodeList;
3965     winShmNodeList = pShmNode;
3968       pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
3969       if( pShmNode->mutex==0 ){
3980     rc = winOpen(pDbFd->pVfs, pShmNode->zFilename,
3981                  (sqlite3_file*)&pShmNode->hFile,
3985                        pShmNode->zFilename);
3988     if( outFlags==SQLITE_OPEN_READONLY ) pShmNode->isReadonly = 1;
3990     rc = winLockSharedMemory(pShmNode);
3995   p->pShmNode = pShmNode;
3997   p->id = pShmNode->nextShmId++;
3999   pShmNode->nRef++;
4010   sqlite3_mutex_enter(pShmNode->mutex);
4011   p->pNext = pShmNode->pFirst;
4012   pShmNode->pFirst = p;
4013   sqlite3_mutex_leave(pShmNode->mutex);
4018   winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
4036   winShmNode *pShmNode; /* The underlying shared-memory file */  local
4042   pShmNode = p->pShmNode;
4046   sqlite3_mutex_enter(pShmNode->mutex);
4047   for(pp=&pShmNode->pFirst; (*pp)!=p; pp = &(*pp)->pNext){}
4053   sqlite3_mutex_leave(pShmNode->mutex);
4058   assert( pShmNode->nRef>0 );
4059   pShmNode->nRef--;
4060   if( pShmNode->nRef==0 ){
4080   winShmNode *pShmNode;  local
4085   pShmNode = p->pShmNode;
4086   if( NEVER(pShmNode==0) ) return SQLITE_IOERR_SHMLOCK;
4098   sqlite3_mutex_enter(pShmNode->mutex);
4103     for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
4111       rc = winShmSystemLock(pShmNode, WINSHM_UNLCK, ofst+WIN_SHM_BASE, n);
4128     for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
4139         rc = winShmSystemLock(pShmNode, WINSHM_RDLCK, ofst+WIN_SHM_BASE, n);
4153     for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
4164       rc = winShmSystemLock(pShmNode, WINSHM_WRLCK, ofst+WIN_SHM_BASE, n);
4171   sqlite3_mutex_leave(pShmNode->mutex);
4221   winShmNode *pShmNode;  local
4232   pShmNode = pShm->pShmNode;
4234   sqlite3_mutex_enter(pShmNode->mutex);
4235   if( pShmNode->isUnlocked ){
4236     rc = winLockSharedMemory(pShmNode);
4238     pShmNode->isUnlocked = 0;
4240   assert( szRegion==pShmNode->szRegion || pShmNode->nRegion==0 );
4242   if( pShmNode->nRegion<=iRegion ){
4247     pShmNode->szRegion = szRegion;
4253     rc = winFileSize((sqlite3_file *)&pShmNode->hFile, &sz);
4268       rc = winTruncate((sqlite3_file *)&pShmNode->hFile, nByte);
4278         pShmNode->aRegion, (iRegion+1)*sizeof(apNew[0])
4284     pShmNode->aRegion = apNew;
4286     if( pShmNode->isReadonly ){
4291     while( pShmNode->nRegion<=iRegion ){
4296       hMap = osCreateFileMappingFromApp(pShmNode->hFile.h,
4300       hMap = osCreateFileMappingW(pShmNode->hFile.h,
4304       hMap = osCreateFileMappingA(pShmNode->hFile.h,
4309                osGetCurrentProcessId(), pShmNode->nRegion, nByte,
4312         int iOffset = pShmNode->nRegion*szRegion;
4324                  osGetCurrentProcessId(), pShmNode->nRegion, iOffset,
4328         pShmNode->lastErrno = osGetLastError();
4329         rc = winLogError(SQLITE_IOERR_SHMMAP, pShmNode->lastErrno,
4335       pShmNode->aRegion[pShmNode->nRegion].pMap = pMap;
4336       pShmNode->aRegion[pShmNode->nRegion].hMap = hMap;
4337       pShmNode->nRegion++;
4342   if( pShmNode->nRegion>iRegion ){
4345     char *p = (char *)pShmNode->aRegion[iRegion].pMap;
4350   if( pShmNode->isReadonly && rc==SQLITE_OK ) rc = SQLITE_READONLY;
4351   sqlite3_mutex_leave(pShmNode->mutex);