A bug in my code

[Manfred_Nowak]

bearophile wrote:
> > this.list_tail.next = new_block;
> So that code looks correct to me.

Sorrily it might be correct only at the surface. In the deeper grounds 
your coding might be lead by some wrong assumptions on the semantics of 
the interface to the GC.

You are setting the attribute of `hasNoPointers' for each and every 
memory block you `malloc'. But this is not true, because with the 
assignment above you are introducing a pointer into that area, without 
calling `hasPointers'.

This means that on the nextrun of `FullCollect' close to no elements of 
the list are referenced anymore: they all get collected, except `head' 
and `tail' ofcourse.

You can see this by introducing a simple printout:
|   int ncopy = min(aux_ptr.len, this.total_len - pos);
|   writefln( ncopy);

which will printout the lines
|   4
|   69996
|   0
|   .....
for the second run of `st.toarray'.

-manfred
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