> -----Original Message-----
> From: John Saunders [SMTP:john.saund...@nlc.net.au]
> Sent: Monday, February 01, 1999 10:53 AM
> To: freebsd-current@FreeBSD.ORG
> Cc: Dan Swartzendruber
> Subject: Re: btokup().. patch to STYLE(9) (fwd)
>
> In nlc.lists.freebsd-current you wrote:
> > At 12:09 PM 2/1/99 +1100, Gregory Bond wrote:
> >>> "You are not supposed to understand this."
>
> "You are not expected to understand this."
>
>
> It's inside the swtch() function call. Just having a quick look now.
>
> Inside expand(), where core is allocated for a process, if no core is
> available the process is swapped out with a call to xswap(), then
> switched out with a call to swtch(). When core becomes available and
> the process image is read in from swap, the process will be selected
> by swtch() to become runnable. However with the current context,
> swtch()
> would return and the tail end of the expand() function would execute.
> So inside expand() a call is made to save the stack state so that when
> swtch() restores this state, the return skips over the expand()
> function
> entirely.
>
[ML] I don't understand that. But, then again, I am not
supposed to :)
P.S I did understand it, but it was too good an opportunitiy to
miss.
/Marino
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