[haiku-appserver] Re: deadlock
- From: "Stephan Assmus" <superstippi@xxxxxx>
- To: haiku-appserver@xxxxxxxxxxxxx
- Date: Wed, 06 Apr 2005 11:28:18 +0200 CEST
Hi,
> While playing yesterday I found a "pretty nice" situation.
> You can reproduce it by adding a single line:
> MoveBy(10,10);
8<
> Looks to me StringWidth() is not implemented well. I tested this
> on R5 and it works.
> The reason: when you create a BApplication object its looper is
> locked until you call ::Run(). StringWidth() uses
> BApplication's server connection and for that it must acquire
> BApplication's lock. Because StringWidth() is called from
> BWindow's thread we get a deadlock.
> Don't know how this should be solved... I guess we should use
> BWindow for getting font data. Just a thought.
If you try this on R5, you should be thrown into the debugger with "The
looper must be locked." I would assume that the window link should be
used instead of the applications for StringWidth(). Because normally,
the window is the one which you would lock. The thing I don't get is
how BView::StringWidth() is related to BWindow::MoveBy().
Best regards,
-Stephan
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