socket synchronization (was "Celeste sending/fetching mail with Michaels refactored clients")
Andreas.Raab at gmx.de
Andreas.Raab at gmx.de
Tue Nov 19 18:19:00 UTC 2002
I can't find any test suite in the package - what is it called?
- Andreas
>
> Hi,
>
> this is the original bug report I sent:
>
> >
> > in my network rewrite code I inserted a short delay in
> > Socket>>waitForDataUntil: .
> >
> > Without this delay the code sometimes hangs in the FTPClientTest suite.
> > It seems to be more reliably reproducable with slower ftp site.
> > Platform Win2k.
>
> Anyways. The way I arrived at this hack was while running the ftp test
> suite that comes with the network rewrite (see SqueakMap for the
> location). It reproducable hang (newest VM, Win2k, T1 connection) while
> waiting on the ReadSemaphore in waitForDataUntil: I then inserted
> Transcript messages before and after the semaphore wait message to see
> what's going on and it suddenly worked. That's why I ended up putting in
> that delay and posted the bug report.
>
> I know this delay doesn't make sense even without knowing the underlying
> Socket code.
>
> I'll remove it in the next iteration and see if and how many people
> holler...
>
> Michael
>
>
>
> Andreas.Raab at gmx.de wrote:
> > Okay, I just checked some code and the delay makes no sense whatsoever
> to
> > me. Try taking it out. The only issue that it _might_ be related to (but
> it is
> > not clear to me how) is that incorrectly written client code might loop
> > endlessly under certain conditions if it does not check for errors
> during tight
> > loops of reading data. Because this has been a problem in some cases, I
> changed
> > the primitive to FAIL (instead of silently returning that no data has
> been
> > read).
> >
> > In any case, the delay makes no sense. If there's a problem let me know
> but
> > make sure you got the latest VM.
> >
> > Cheers,
> > - Andreas
> >
> >
> >>>The 10ms delay (actually in the Socket code) is a workaround for the
> >>>semaphore timeout seeming to hang occasionally at least on Windows.
> >>
> >>Hm... a bit more information would be helpful. "seeming to hang
> >>occasionally" is not very descriptive. Does it hang? If so, where? What
> >>happens if you do
> >>a "print network state" from the VMs debug menu? Any particular test
> case
> >>where it does hang (even if occasionally)? Platforms this was found on?
> >>
> >>Cheers,
> >> - Andreas
> >>
> >
> >
>
>
>
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