Re: [kaffe] Threads & Boehm GC

[Guilhem Lavaux]

Helmer Kr�mer wrote:
On Sat, 24 Jul 2004 11:59:40 +0200
Guilhem Lavaux <[EMAIL PROTECTED]> wrote:
 

Helmer Kr�mer wrote:
   

On Sat, 24 Jul 2004 09:38:08 +0200
Guilhem Lavaux <[EMAIL PROTECTED]> wrote:
Hi,

     

It seems that the Boehm-GC needs to catch a number of pthread calls. 
This is not evident to implement in kaffe but I think I can do the 
following:
[...]
Any comments ?
  

       

why does the gc_pthread_redirects.h thing from boehm not
work? I mean if kaffevm/gc.h included a header file called
"gc-impl.h" from kaffevm/kaffe-gc or kaffevm/boehm-gc and
unix-pthreads/thread-impl.c included kaffevm/gc.h (and thus
boehm-gc/gc-impl.h), it should work, shouldn't it?

     

Yes, but I'd like not to have to include any boehm specific includes in 
pthreads.
If I do this, the unix-pthreads will be stuck with the boehm-gc once it 
is compiled.

If we want to have a '-Xkaffe-gc' to switch to the standard GC we may 
not be able to do so if we chose this way.
   

Note that there will be a lot more problems if we wanted to implement
such an option. For example, if you wanted to be able to switch between
an incremental and a conservative GC you would have to modify the vm
itself so it properly tells the gc whenever a pointer is written (or
accept a huge overhead). Therefore, I'd rather select boehm or kaffe
at compile time and have -X options only for options specific to the
selected implementation. Just because it will be easier. Why would one
have to switch between kaffe and boehm at runtime, anyways?
 

I see your point. We may select your option for the moment. But I'd 
prefer to keep the inclusion to boehm's gc.h only in thread-impl.c to 
prevent the VM from being polluted by other symbols.

BTW, I've noticed recently that the VM is not for the moment capable of 
handling incremental GC. As the symbol KGC_WRITE has been left 
undefined. I may try to merge some things from JanosVM about it (as it 
supports incremental GC) afterwards.

Cheers,
Guilhem.
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