Date: Thu, 05 May 2005 15:48:48 -0600 From: Scott Long <scottl@samsco.org> To: Halil Demirezen <halil@enderunix.org> Cc: freebsd-hackers@freebsd.org Subject: Re: A bit confused with the sched_4bsd.c code Message-ID: <427A94C0.1020205@samsco.org> In-Reply-To: <200505060010.26184.halil@enderunix.org> References: <200505060010.26184.halil@enderunix.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 =-) Scitt
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