Scott Long wrote:
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...
Thanks.
Look near the top of the file for:
#define td_kse td_sched
That makes td->td_kse resolve to td->td_sched. Now, there is other magic associated with td_sched in each scheduler source file, but that's different matter =-)
this is a "temporary" (for a coupe of years) :-) thing
as teh two structures were merged, but I didn't want to change all the files references because that would
make all the diffs to larde and obscure teh real differences.
at some point in teh future I will commit a change that cleans this up but doesn't change anything else.
Scitt
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