SQLite

        pFile->shared->nReaders ++;
      }
      bReturn = TRUE;
    }
  }

  /* Want a pending lock? */
  else if (dwFileOffsetLow == (DWORD)PENDING_BYTE && nNumberOfBytesToLockLow == 1){

    /* If no pending lock has been acquired, then acquire it */
    if (pFile->shared->bPending == 0) {
      pFile->shared->bPending = TRUE;
      pFile->local.bPending = TRUE;
      bReturn = TRUE;
    }
  }

  /* Want a reserved lock? */
  else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE && nNumberOfBytesToLockLow == 1){

    if (pFile->shared->bReserved == 0) {
      pFile->shared->bReserved = TRUE;
      pFile->local.bReserved = TRUE;
      bReturn = TRUE;
    }
  }

      pFile->local.bExclusive = FALSE;
      pFile->shared->bExclusive = FALSE;
      bReturn = TRUE;
    }

    /* Did we just have a reader lock? */
    else if (pFile->local.nReaders){
      assert(nNumberOfBytesToUnlockLow == (DWORD)SHARED_SIZE || nNumberOfBytesToUnlockLow == 1);

      pFile->local.nReaders --;
      if (pFile->local.nReaders == 0)
      {
        pFile->shared->nReaders --;
      }
      bReturn = TRUE;
    }
  }

  /* Releasing a pending lock */
  else if (dwFileOffsetLow == (DWORD)PENDING_BYTE && nNumberOfBytesToUnlockLow == 1){

    if (pFile->local.bPending){
      pFile->local.bPending = FALSE;
      pFile->shared->bPending = FALSE;
      bReturn = TRUE;
    }
  }
  /* Releasing a reserved lock */
  else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE && nNumberOfBytesToUnlockLow == 1){

    if (pFile->local.bReserved) {
      pFile->local.bReserved = FALSE;
      pFile->shared->bReserved = FALSE;
      bReturn = TRUE;
    }
  }

      rc = SQLITE_IOERR_NOMEM;
      goto shm_open_err;
    }

    rc = winOpen(pDbFd->pVfs,
                 pShmNode->zFilename,             /* Name of the file (UTF-8) */
                 (sqlite3_file*)&pShmNode->hFile,  /* File handle here */
                 SQLITE_OPEN_WAL | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, /* Mode flags */
                 0);
    if( SQLITE_OK!=rc ){
      goto shm_open_err;
    }

    /* Check to see if another process is holding the dead-man switch.
    ** If not, truncate the file to zero length. 

  if( h==INVALID_HANDLE_VALUE ){
    pFile->lastErrno = lastErrno;
    winLogError(SQLITE_CANTOPEN, pFile->lastErrno, "winOpen", zUtf8Name);
    sqlite3_free(zConverted);
    if( isReadWrite && !isExclusive ){
      return winOpen(pVfs, zName, id, 
             ((flags|SQLITE_OPEN_READONLY)&~(SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE)), pOutFlags);


    }else{
      return SQLITE_CANTOPEN_BKPT;
    }
  }

  if( pOutFlags ){
    if( isReadWrite ){

      WIN32_FILE_ATTRIBUTE_DATA sAttrData;
      memset(&sAttrData, 0, sizeof(sAttrData));
      if ( osGetFileAttributesExW(zConverted, GetFileExInfoStandard,
                                  &sAttrData) ){
        attr = sAttrData.dwFileAttributes;
      }else{
        lastErrno = osGetLastError();
        if( lastErrno==ERROR_FILE_NOT_FOUND || lastErrno==ERROR_PATH_NOT_FOUND ){

          rc = SQLITE_IOERR_DELETE_NOENT; /* Already gone? */
        }else{
          rc = SQLITE_ERROR;
        }
        break;
      }
#else
      attr = osGetFileAttributesW(zConverted);
#endif
      if ( attr==INVALID_FILE_ATTRIBUTES ){
        lastErrno = osGetLastError();
        if( lastErrno==ERROR_FILE_NOT_FOUND || lastErrno==ERROR_PATH_NOT_FOUND ){

          rc = SQLITE_IOERR_DELETE_NOENT; /* Already gone? */
        }else{
          rc = SQLITE_ERROR;
        }
        break;
      }
      if ( attr&FILE_ATTRIBUTE_DIRECTORY ){

  }
#ifdef SQLITE_WIN32_HAS_ANSI
  else{
    do {
      attr = osGetFileAttributesA(zConverted);
      if ( attr==INVALID_FILE_ATTRIBUTES ){
        lastErrno = osGetLastError();
        if( lastErrno==ERROR_FILE_NOT_FOUND || lastErrno==ERROR_PATH_NOT_FOUND ){

          rc = SQLITE_IOERR_DELETE_NOENT; /* Already gone? */
        }else{
          rc = SQLITE_ERROR;
        }
        break;
      }
      if ( attr&FILE_ATTRIBUTE_DIRECTORY ){

    ** NOTE: We are dealing with a relative path name and the data
    **       directory has been set.  Therefore, use it as the basis
    **       for converting the relative path name to an absolute
    **       one by prepending the data directory and a slash.
    */
    char zOut[MAX_PATH+1];
    memset(zOut, 0, MAX_PATH+1);
    cygwin_conv_to_win32_path(zRelative, zOut); /* POSIX to Win32 */

    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s\\%s",
                     sqlite3_data_directory, zOut);
  }else{
    /*
    ** NOTE: The Cygwin docs state that the maximum length needed
    **       for the buffer passed to cygwin_conv_to_full_win32_path
    **       is MAX_PATH.
    */
    cygwin_conv_to_full_win32_path(zRelative, zFull);
  }
  return SQLITE_OK;
#endif

#if (SQLITE_OS_WINCE || SQLITE_OS_WINRT) && !defined(__CYGWIN__)
  SimulateIOError( return SQLITE_ERROR );
  /* WinCE has no concept of a relative pathname, or so I am told. */

  sqlite3_free(zConverted);
  return (void*)h;
}
static void winDlError(sqlite3_vfs *pVfs, int nBuf, char *zBufOut){
  UNUSED_PARAMETER(pVfs);
  getLastErrorMsg(osGetLastError(), nBuf, zBufOut);
}
static void (*winDlSym(sqlite3_vfs *pVfs, void *pHandle, const char *zSymbol))(void){
  UNUSED_PARAMETER(pVfs);
  return (void(*)(void))osGetProcAddressA((HANDLE)pHandle, zSymbol);
}
static void winDlClose(sqlite3_vfs *pVfs, void *pHandle){
  UNUSED_PARAMETER(pVfs);
  osFreeLibrary((HANDLE)pHandle);
}
#else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
  #define winDlOpen  0

  FILETIME ft;
  static const sqlite3_int64 winFiletimeEpoch = 23058135*(sqlite3_int64)8640000;
#ifdef SQLITE_TEST
  static const sqlite3_int64 unixEpoch = 24405875*(sqlite3_int64)8640000;
#endif
  /* 2^32 - to avoid use of LL and warnings in gcc */
  static const sqlite3_int64 max32BitValue = 
      (sqlite3_int64)2000000000 + (sqlite3_int64)2000000000 + (sqlite3_int64)294967296;


#if SQLITE_OS_WINCE
  SYSTEMTIME time;
  osGetSystemTime(&time);
  /* if SystemTimeToFileTime() fails, it returns zero. */
  if (!osSystemTimeToFileTime(&time,&ft)){
    return SQLITE_ERROR;