What happens on timeslice overrun?

Udo A. Steinberg us15 at os.inf.tu-dresden.de
Mon Sep 26 15:15:52 CEST 2005

On Mon, 26 Sep 2005 14:32:32 +0200 Rene Wittmann (RW) wrote:

RW> So a call to l4_thread_ex_regs is sufficient and I would cancel the
RW> next_period-IPC 
RW> with: l4_thread_ex_regs(main_thread_id, 0xFFFFFFFF, 0xFFFFFFFF, &id1, &id2,
RW> &w1, &w2, &w3)??
RW> (l4_thread_id id1=id2=L4_INVALID_ID, l4_umword_t w1,w2,w3).
RW> If it's that simple, it's fine!

Right. Except that in the current Fiasco implementation an IPC will be
cancelled only if you explicitly set EIP to something other than 0xffffffff.

This seems like an unneeded restriction to me and I'm currently discussing
with our group if this restriction can be removed. I'll send you a patch and
commit the change to CVS in that case. Meanwhile you can mimic the desired
behavior by setting the EIP of ex_regs to the instruction following the
int $0x30 of the l4_next_period call, which is of course quite suboptimal.


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