Re: context switch vs. signal delivery [was: Re: Accelerating user mode linux]

[Jamie Lokier]

Andi Kleen wrote:
> > 2: What happens when the user's signal handler decides it wants to save
> > the FPU state itself (after all) and proceed with some FPU use.  Will
> > sigreturn restore the user-saved FPU state?  Just curious.
> 
> Nope it won't because there is no saved state. The previous context's FPU 
> state will be silently corrupted.

I meant if the user's signal handler decides it wants to save the FPU
state directly into the signal context struct, after deciding to do
that.  Won't that work?

-- Jamie