On Sat, 20 Mar 1999, Matthew Dillon wrote:
>
> :> > rfork(RFMEM) doesn't easily work from C. You need to
> :> > create an assembly stub.
> :> >
> :> > --
> :> > John | Never try to teach a pig to sing,
> :> > dy...@iquest.net | it makes one look stupid
> :> > jdy...@nc.com | and it irritates the pig.
> :> >
> :>
> :> I've seen about 6 people ask about this because the manual lies about
> :> what is done. I asked a while back about it, and John was kind enough
> :> to dig up some code that used rfork to properly split the stack should
> :> I try to dig it up?
> :>
> :> In the meantime, can someone commit this or suggest something?
> :
> :For the suggest something, you realize that with Richard's VM_STACK code it
> :should be relatively trivial to make this automatic (suggestion: add
> :RFSTACK flag).
> :
> : Brian Feldman _ __ ___ ___ ___
> : gr...@unixhelp.org _ __ ___ | _ ) __| \
> : http://www.freebsd.org/ _ __ ___ ____ | _ \__ \ |) |
> : FreeBSD: The Power to Serve! _ __ ___ ____ _____ |___/___/___/
>
> If the goal is to completely share the address space, which
> RFMEM does, you can't split anything, not even the stack. It
> sure would be useful if there were a standard clib call adequate
> for calling rfork() and calling a function in the child w/ a new
> stack.
Hence the NEW flag RFSTACK. Why would this be a bad thing? This would keep
the old behavior and allow much nicer new behavior. I didn't suggest
changing the old behavior. This would just greatly simplify things so all of
the assembly wouldn't be needed. Hmm... actually... if one were to mmap() a
stack and as soon as the rfork() returned movl newstack,%esp and whatnot,
wouldn't this be a pretty simple solution?
>
> -Matt
> Matthew Dillon
> <dil...@backplane.com>
>
>
>
>
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Brian Feldman _ __ ___ ___ ___
gr...@unixhelp.org _ __ ___ | _ ) __| \
http://www.freebsd.org/ _ __ ___ ____ | _ \__ \ |) |
FreeBSD: The Power to Serve! _ __ ___ ____ _____ |___/___/___/
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