SQLite

    os2DlOpen,         /* xDlOpen */
    os2DlError,        /* xDlError */
    os2DlSym,          /* xDlSym */
    os2DlClose,        /* xDlClose */
    os2Randomness,     /* xRandomness */
    os2Sleep,          /* xSleep */
    os2CurrentTime,    /* xCurrentTime */
    os2GetLastError    /* xGetLastError */
    0,                 /* xShmOpen */
    0,                 /* xShmSize */
    0,                 /* xShmPush */
    0,                 /* xShmPull */
    0,                 /* xShmLock */
    0,                 /* xShmClose */
    0,                 /* xShmDelete */
    0,                 /* xRename */
    0,                 /* xCurrentTimeInt64 */
  };
  sqlite3_vfs_register(&os2Vfs, 1);
  initUconvObjects();
  return SQLITE_OK;
}
int sqlite3_os_end(void){
  freeUconvObjects();

  return rc;
}

/*
** Query and/or changes the size of a shared-memory segment.
** The reqSize parameter is the new size of the segment, or -1 to
** do just a query.  The size of the segment after resizing is
** written into pNewSize.  The start of the shared memory buffer



** is stored in **ppBuffer.


*/
static int unixShmSize(
  sqlite3_shm *pSharedMem,  /* Pointer returned by unixShmOpen() */
  int reqSize,              /* Requested size.  -1 for query only */
  int *pNewSize,            /* Write new size here */
  char **ppBuf              /* Write new buffer origin here */
){

      }
    }
  }
  *pNewSize = p->size;
  *ppBuf = p->pBuf;
  return rc;
}









/*
** Create or release a lock on shared memory.
*/
static int unixShmLock(
  sqlite3_shm *pSharedMem,   /* Pointer from unixShmOpen() */
  int lockType,              /* _RDLK, _WRLK, or _UNLK, possibly ORed _BLOCK */

    unixDlClose,          /* xDlClose */                    \
    unixRandomness,       /* xRandomness */                 \
    unixSleep,            /* xSleep */                      \
    unixCurrentTime,      /* xCurrentTime */                \
    unixGetLastError,     /* xGetLastError */               \
    unixShmOpen,          /* xShmOpen */                    \
    unixShmSize,          /* xShmSize */                    \

    0,                    /* xShmPush */                    \
    0,                    /* xShmPull */                    \
    unixShmLock,          /* xShmLock */                    \
    unixShmClose,         /* xShmClose */                   \
    unixShmDelete,        /* xShmDelete */                  \
    0,                    /* xRename */                     \
    0,                    /* xCurrentTimeInt64 */           \

    winDlOpen,         /* xDlOpen */
    winDlError,        /* xDlError */
    winDlSym,          /* xDlSym */
    winDlClose,        /* xDlClose */
    winRandomness,     /* xRandomness */
    winSleep,          /* xSleep */
    winCurrentTime,    /* xCurrentTime */
    winGetLastError    /* xGetLastError */
    0,                 /* xShmOpen */
    0,                 /* xShmSize */
    0,                 /* xShmPush */
    0,                 /* xShmPull */
    0,                 /* xShmLock */
    0,                 /* xShmClose */
    0,                 /* xShmDelete */
    0,                 /* xRename */
    0,                 /* xCurrentTimeInt64 */
  };

  sqlite3_vfs_register(&winVfs, 1);
  return SQLITE_OK; 
}
int sqlite3_os_end(void){ 
  return SQLITE_OK;

  int (*xCurrentTime)(sqlite3_vfs*, double*);
  int (*xGetLastError)(sqlite3_vfs*, int, char *);
  /*
  ** The methods above are in version 1 of the sqlite_vfs object
  ** definition.  Those that follow are added in version 2 or later
  */
  int (*xShmOpen)(sqlite3_vfs*, const char *zName, sqlite3_shm**);
  int (*xShmSize)(sqlite3_shm*, int reqSize, int *pNewSize, char **);

  int (*xShmPush)(sqlite3_shm*);
  int (*xShmPull)(sqlite3_shm*);
  int (*xShmLock)(sqlite3_shm*, int lockType, int ofst, int nByte);
  int (*xShmClose)(sqlite3_shm*);
  int (*xShmDelete)(sqlite3_vfs*, const char *zName);
  int (*xRename)(sqlite3_vfs*, const char *zOld, const char *zNew, int dirSync);
  int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);

    cfDlOpen,             /* xDlOpen */
    cfDlError,            /* xDlError */
    cfDlSym,              /* xDlSym */
    cfDlClose,            /* xDlClose */
    cfRandomness,         /* xRandomness */
    cfSleep,              /* xSleep */
    cfCurrentTime,        /* xCurrentTime */
    0,                    /* xShmOpen */
    0,                    /* xShmSize */
    0,                    /* xShmPush */
    0,                    /* xShmPull */
    0,                    /* xShmLock */
    0,                    /* xShmClose */
    0,                    /* xShmDelete */
    0,                    /* xRename */
    0                     /* xCurrentTimeInt64 */
  };

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "ENABLE");
    return TCL_ERROR;
  }

    demoDlOpen,                   /* xDlOpen */
    demoDlError,                  /* xDlError */
    demoDlSym,                    /* xDlSym */
    demoDlClose,                  /* xDlClose */
    demoRandomness,               /* xRandomness */
    demoSleep,                    /* xSleep */
    demoCurrentTime,              /* xCurrentTime */
    0,                            /* xShmOpen */
    0,                            /* xShmSize */
    0,                            /* xShmPush */
    0,                            /* xShmPull */
    0,                            /* xShmLock */
    0,                            /* xShmClose */
    0,                            /* xShmDelete */
    0,                            /* xRename */
    0                             /* xCurrentTimeInt64 */
  };
  return &demovfs;
}

#endif /* !defined(SQLITE_TEST) || defined(SQLITE_OS_UNIX) */

  0,                        /* xDlError */
  0,                        /* xDlSym */
  0,                        /* xDlClose */
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
  devsymRandomness,         /* xRandomness */
  devsymSleep,              /* xSleep */
  devsymCurrentTime,        /* xCurrentTime */
  0,                        /* xShmOpen */
  0,                        /* xShmSize */
  0,                        /* xShmPush */
  0,                        /* xShmPull */
  0,                        /* xShmLock */
  0,                        /* xShmClose */
  0,                        /* xShmDelete */
  0,                        /* xRename */
  0                         /* xCurrentTimeInt64 */
};

static sqlite3_io_methods devsym_io_methods = {
  1,                            /* iVersion */
  devsymClose,                      /* xClose */
  devsymRead,                       /* xRead */
  devsymWrite,                      /* xWrite */

  jtDlOpen,                      /* xDlOpen */
  jtDlError,                     /* xDlError */
  jtDlSym,                       /* xDlSym */
  jtDlClose,                     /* xDlClose */
  jtRandomness,                  /* xRandomness */
  jtSleep,                       /* xSleep */
  jtCurrentTime,                 /* xCurrentTime */
  0,                             /* xShmOpen */
  0,                             /* xShmSize */
  0,                             /* xShmPush */
  0,                             /* xShmPull */
  0,                             /* xShmLock */
  0,                             /* xShmClose */
  0,                             /* xShmDelete */
  0,                             /* xRename */
  0                              /* xCurrentTimeInt64 */
};

static sqlite3_io_methods jt_io_methods = {
  1,                             /* iVersion */
  jtClose,                       /* xClose */
  jtRead,                        /* xRead */
  jtWrite,                       /* xWrite */

  instDlOpen,             /* xDlOpen */
  instDlError,            /* xDlError */
  instDlSym,              /* xDlSym */
  instDlClose,            /* xDlClose */
  instRandomness,         /* xRandomness */
  instSleep,              /* xSleep */
  instCurrentTime,        /* xCurrentTime */
  0,                      /* xShmOpen */
  0,                      /* xShmSize */
  0,                      /* xShmPush */
  0,                      /* xShmPull */
  0,                      /* xShmLock */
  0,                      /* xShmClose */
  0,                      /* xShmDelete */
  0,                      /* xRename */
  0                       /* xCurrentTimeInt64 */
};

static sqlite3_io_methods inst_io_methods = {
  1,                            /* iVersion */
  instClose,                      /* xClose */
  instRead,                       /* xRead */
  instWrite,                      /* xWrite */

/*
** This file contains the implementation of a log file used in 
** "journal_mode=wal" mode.
*/


/*
** LOG FILE FORMAT
**
** A log file consists of a header followed by zero or more log frames.
** The log header is 12 bytes in size and consists of the following three
** big-endian 32-bit unsigned integer values:

**
** MUTEX:  The MUTEX lock is used as a robust inter-process mutex. It
**         is held while the log-summary header is modified, and 
**         sometimes when it is read. It is also held while a new client
**         obtains the DMH lock (see below), and while log recovery is
**         being run.
**
** DMH:    The DMH (Dead Mans Hand mechanism) lock is used to ensure
**         that log-recovery is always run following a system restart.
**         When it first opens a log-summary file, a process takes a
**         SHARED lock on the DMH region. This lock is not released until
**         the log-summary file is closed. 
**
**         The process then attempts to upgrade to an EXCLUSIVE lock. If 
**         successful, then the contents of the log-summary file are deemed