Small example of livelock regression in garbage collector forGCJ 3.3 under Win32

Thu May 22 08:12:00 GMT 2003

> > > > >>You need -fuse-divide-subroutine and -fcheck-references. Ranjit ahd a
> > > > >>look at using Windows' structured exception handling to cope with
> > > > >>these problems, but I don't think that it's done yet.
> > > >
> > > > Andrew, if I understand this correctly, you are suggesting that
> > > > we use these options for the time being till such a time
> > > > that we can fix the SEH stuff.

[...]
> > How does the following look (tested only on Win98 so far)? It's
> > against 3.3 sources:
>> That looks fine. If it solves =?iso-8859-1?Q?=D8yvind_Harboe?='s
> problem I'll be happy. However, he's not building his own libgcj but
> using one from Mohan, so we'll have to wait until Mohan does a rebuild
> with this patch. Pretty please, if you would...

I must mention that even with Mohan's current build, if
I compile my "double-real-null" test program with
"-fcheck-references" it doesn't hang on Win2K as it does
(*consistently*) otherwise.
I'm attaching the test program with this message for everyone's
reference. On Win2K (and possibly on WinXP and WinNT4, but not
on Win98), this program *hangs* after printing "Strike 1!"
if compiled with Mohan's current snapshot as is, but prints
an additional "Strike 2!" and exits normally if compiled with
"-fcheck-references".
Of course beyond such trivial programs, the whole of libgcj
will have to be built with these flags for things to be
consistent.
BTW, these flags get added to "libgcj.spec" - now when I
build the GCJ cross compiler, I --disable-libgcj (to save
1 hour from the build time!) so no such file is created - does
that mean that the crossed-native GCJ/libgcj that is built
using this cross compiler will *not* be compiled using
these flags?
If yes, I need to look at some other way to propagate
these flags to the GCJ cross-compiler without having to
build the whole of libgcj.
Ranjit.
-- 
Ranjit Mathew Email: rmathew AT hotmail DOT com
Bangalore, INDIA. Web: http://ranjitmathew.tripod.com/
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