[vtkusers] Java + Linux Xlib Error

[J.A. Lee]

Hi Peter,
I was able to alleviate the problem by upgrading to the most recent 7.2 
redhat (using up2date).  I'm not sure which libs fixed the problem. 
 Compiling vtk with threads hasn't presented any problems for me on 
linux, but it potentially can on other systems.  Linux java uses native 
pthreads, so all should be ok.  I have been investigating the source of 
the async errors - it stems from the fact that the jvm doesn't call 
XInitThreads before making other xlib calls.  XInitThreads is an X 
function that allows the display to be updated from multiple threads. 
 Upgrading is only half the battle though, once you want to display 
multiple vtkRenderWindows, you will experience the same problem - which 
isn't solved by a simple upgrade.  But you should be able to display 
them either tabbed or in a cardlayout.  Perhaps the next version of X 
will shape up, or java might improve - tough to say.

P.S.  one thing that would work in a pinch is to use mesa4.0 with 
threads on, but you lose any hardware acceleration you may have had.
-Jeff

Peter J. Carr wrote:

> I get the following XLib error as soon as I interact (drag my mouse on 
> the cone) with SimpleVTK:
>    Xlib: unexpected async reply (sequence 0x1f1)!
> I also had this problem circa 1998 (vtk2.*) in an SGI (Irix 6.3).
>
> I am now running VTK4 on a Linux machine (RedHat7.2). I tried running 
> with jdk1.3 from Sun, jdk1.4(beta) from Sun, and jdk1.3 from IBM. All 
> result in the same problem. I compiled vtk with pthreads.
>
> Any ideas, suggestions?
>
> I don't have a great understanding of the different thread libraries 
> on a linux system so pointers to info are appreciated.
>
> - Peter Carr
>
>
>
>
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