Dear Marc, dear Joern,
On Tue, Oct 30, 2001 at 01:09:56AM +0100, Marc Hemberger wrote:
> So, in my review, I would say, you are talking about two very different
> things: ROOT system crash (as implied by your statement about
> long-living applications over days) versus a TMonitor::Select() hang up
> (nothimg is received by the file descriptor). I don't know how to solve
> Volkers special problem with the Select() (only ideas, which I told him
> already privately), but at least in my application we don't see any
> potential conflict and no system "core dumps" or "segmentation
> violations" as you imply it. This just for clarity.
>
> A never returning Select() might have several reasons, but "unsafe"
> lists in ROOT should lead sooner or later but always to a system crash,
> as you mentioned it correctly. I don't see how unprotected lists could
> produce a deadlock.
I just made some tests and I realized that I - maybe - made the
situation not clear enough. What I was using was a standard Root
session to start the thread. I was using
[] TThread *thp = new TThread("top",top,(void*)0);
[] thp->Run();
on the command line with the result, that the use of TMonitor::Select()
was not possible. A given timeout did not help at all!
On the other hand, when I use a standalone TROOT application with two
server threads on two different ports, the use of TMonitor::Select()
seems to make no problem.
Best regards,
Volker
--
Dr. Volker Hejny Tel: 02461/616853 **
Institut f. Kernphysik Fax: 02461/613930 **
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