Date: Fri, 6 May 2005 09:39:21 +0200 From: gerarra@tin.it To: freebsd-hackers@freebsd.org Subject: Re: A bit confused with the sched_4bsd.c code Message-ID: <427AE2F700000446@ims3a.cp.tin.it> In-Reply-To: <427A94C0.1020205@samsco.org>
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>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 =-) If you *really* want to dig inside sources remind that grep is your friend rookie
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