[ TODO ]

  - $B4X?t$NJV$jCM$r$-$A$s$H07$&(B
     $B!J%(%i!<=hM}!$Hs%V%m%C%-%s%0!K(B

  - $B3F4X?t$r(B reentrant $B$K$9$k(B

  - grid_finalize ()
    grid_shutdown ()
    grid_get_error_kind ()
    $B$J$I$N<BAu(B
    
