Re: [AD] window resizing

[Jon Rafkind <workmin@xxxxxxxxxx>]

In answer to your other email, I suppose you're right. If there is a 
context switch right when SCREEN_H is read then the results will be 
incorrect.

Becuase the screen bitmap can now change at any time, the user will be 
required to call acquire_screen()/release_screen() whenever accessing 
the screen. The user should be doing this anyway but becuase there was 
never any way for screen to be modified was not required.

Peter Wang wrote:

> Jon Rafkind wrote:
>
> > The attached patch allows the X11 window driver to be resized. As 
> > explained before, when a ConfigureNotify XEvent is received, the 
> > global resize_screen() is called with the new screen width and 
> > height. resize_screen() checks to see if the driver can handle screen 
> > resizing and then calls gfx_driver->resize_window() which returns a 
> > bitmap. resize_screen sets the global screen bitmap to this bitmap 
> > and the resizing is complete. If a user callback is set, that is 
> > called at the end of resize_screen. I have added an entry to the 
> > GFX_DRIVER and updated all the drivers( i hope ).
>
>
>
> So, assuming the callback is called from a background thread, what 
> happens if the main thread is accessing the current screen bitmap when 
> the resize takes place?
>
> Peter
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now. 
> http://productguide.itmanagersjournal.com/