Re: Application (GC) stuck in "_Jv_MarkArray" when doing "klass->getName();"

[Martin Egholm Nielsen <martin at egholm-nielsen dot dk>]

> > I haven't checked, but I'd be suspicious that getName allocates memory,
> > which acquires the GC lock, which is already held by the same thread.
> > (This is a non-reentrant lock.  Which is good, because things would
> > fail in more complex ways if it weren't.)
> Well, going into getName seems to trace furhter to "_Jv_AllocString" 
> using "_Jv_AllocPtrFreeObj" or "_Jv_AllocPtrFreeObject" depending on the 
> state of "ENABLE_JVMPI". However, now things get deep for me - at least 
> at my current state of knowledge...
> So I don't really know where that leaves the question regarding the 
> non-reentrant lock... :-)
But if this is indeed a matter of locking, what other means do I have at 
that point (_Jv_MarkArray) to identify what the array is actually about?

// Martin

> > On Sat, 18 Mar 2006, Martin Egholm Nielsen wrote:
> >
> > > Hi there,
> > >
> > > In my long and tiresome (for the rest of you) attempts to understand the
> > > doubling of my GC-times, I've now added some output to "_Jv_MarkArray"
> > > to get an idea of what and why there is suddenly an array given of
> > > length 170.000.
> > > (This attempt is a consequence of calling "gcj_describe_type_fn" from
> > > the GC, but it just halted.)
> > > So I added parts of the the code from "gcj_describe_type_fn" into
> > > _Jv_MarkArray:
> > >
> > >   if ( klass ) {
> > >       printf( "MEN: 1\n" );
> > >       jstring name = klass -> getName();
> > >       printf( "MEN: 2\n" );
> > >   } // if
> > >
> > > However, when the GC gets to it, "1" is printed, "2" is not, and the GC
> > > is stuck in between.
> > > Anyone can tell me why this is not "allowed"/fails?
> > >
> > > BR,
> > >  Martin Egholm