[Joeq-devel] NPTL & Checkpointing joeq

[Alan R. <ala...@gm...>]

Hi,

I've 'solved' the threading problem to an extent, when it's more robust I'll
send it on for approval.  I finally ended up using SIGUSR 1 & 2 to
co-ordinate suspending/resuming amongst threads.

I am now trying to write a checkpointer for joeq.  I am thinking along the
lines of saving the heap/code areas created by the *allocators and also  the
stacks and registers of the lightweight threads. Skirting the finer details:
on a restart I would re-map the heap, code, stacks and registers and call
switchThread on jq_native.

When I start to think about how to implement this my head hurts and I can't
see the forest for the trees;  addresses, offsets and paging  are
confounding me.

How should I approach saving the vm-state so that it can be re-used? Is an
approach similar to the bootstrapping phase possibble?

Sorry if this a trivial question, it all seemed straightforward in the
operating systems  books ...

Thanks,
Alan


Department of Information Technology
National University of Ireland, Galway
IRELAND.