Date: Thu, 05 May 2005 16:27:23 -0700 From: Julian Elischer <julian@elischer.org> To: Scott Long <scottl@samsco.org> Cc: Halil Demirezen <halil@enderunix.org> Subject: Re: A bit confused with the sched_4bsd.c code Message-ID: <427AABDB.2090409@elischer.org> In-Reply-To: <427A94C0.1020205@samsco.org> References: <200505060010.26184.halil@enderunix.org> <427A94C0.1020205@samsco.org>
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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 > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to > "freebsd-hackers-unsubscribe@freebsd.org"
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