First draft: rewrite of {get|set|swap}context(3)

[Marcel Moolenaar]

On Mon, Aug 18, 2003 at 06:47:52AM +0800, David Xu wrote:
> 
> Then doesn't signal context in signal handler have a UCF_SIGMASK ?

Yes.

> void    (*__sa_sigaction)(int, struct __siginfo *, ucontext_t *ucp);
> the context *ucp should have UCF_SIGMASK now.

We never define uc_flags currently. We only copyout() uc_sigmask and
uc_mcontext. Hence, the uc_flags field is garbage. As is the uc_stack
field.

> I think it should be UCF_NOSIGMASK. But for libkse, we really needn't
> this kind of hack, because M:N thread in kernel always masks all signals,
> you can always SIGFILLSET(&uc.uc_sigmask) before call set_context.

I tried this, but it didn't fix mutex_d.

-- 
 Marcel Moolenaar	  USPA: A-39004		 marcel at xcllnt.net