A bit confused with the sched_4bsd.c code

[Julian Elischer]

Halil Demirezen wrote:

>Hello,
>
>First of all, I am not sure if this is the correct mail list with posting this 
>mail. I apologize for that.. Second, I may seem to have little 
>C knowledge, though I am using C for about 5 years and plus.
>
>Let's start with the question. I am digging the FreeBSD-5.3 kernel codes.
>Watson's Cross Reference is really helpful. In the schedcpu(void) function
>there is an assignment like "ke = td->td_kse;" on line 438  (see: 
>http://fxr.watson.org/fxr/source/kern/sched_4bsd.c?v=RELENG53#L438").
>When I look at the thread structure at sys/proc.h, I could not see such an
>entry td_kse in the "thread" structure. How has this structure been extended 
>or this entry added to the thread structure?
>
>Although the kernel codes seem to be simply understandable, there still lies
>some difficulties to understand for an average C programmer: magic stuff done
>by professionals. :)
>
>Anyway, any help really will be appreciated...
>  
>

originally there were 2 structures

the kse
and the td_sched

They were merged but the code was kept teh same so that edits would be 
not 'flooded'  in
the diffs.
places that used to refer to ke->ke_xxx still do and places that used to 
refer to td->td_sched->tds_xxx still do
but they are now the same thing.


>Thanks.
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>  
>