Re: RFC: Patch for making GrabPointer work

[Alexandre Julliard]

Jukka Heinonen  writes:
> Storing old windows procedure in struct x11drv_win_data
> would remove the worst race, but unless window
> procedure update is atomic, it would not remove
> all races.

Since you have the window locked when changing the wnd proc the update
will be atomic. The only problem I see is that your wnd proc might get
called to process some other message, but you can solve this by having
it chain to the previous wnd proc for all messages except the special
one.