Re: [AD] Allegro on multi-processor machines

[Chris <kcat@xxxxxxxxxx>]

Evert Glebbeek wrote:
> The test program comes up normally, but it freezes after a time. This can be
> short or fast, and isn't related to any action by me. A backtrace by gdb seems
> to point to _xwin_unlock, suggesting that it is a race condition of some kind.

Is this with or without using X to draw the cursor? If it's Allegro 
drawing the cursor, it's probably Xlib hitting an async as it tries to 
draw the mouse in the timer thread and something else elsewhere.

I honestly can't think of a way to fix this since if you force a call to 
XLOCK and don't increment the lock count, the next graphic routine will 
halt as it tries to lock again, though if you *do* increment the lock 
count, the main program's drwing routines will happilly try to do their 
thing.

> I am also unable to set a fullscreen X11 mode, although the XVidMode extension
> is available. This leaves the system in a screwed up resolution and I can't get
> keyboard control in X until I start another Allegro program. I don't think this
> is related though.

Not totally. That happens when Allegro has the keyboard driver installed 
and gets the mode switched, but Allegro then bombs out and doesn't 
properly close it's X display handle. Or something along those lines.

- Kitty Cat