Date: Sun, 01 Aug 2004 14:01:51 -0400 From: Chuck Swiger <cswiger@mac.com> To: Patrick Dung <patrick_dkt@yahoo.com.hk> Cc: freebsd-questions@freebsd.org Subject: Re: Curious question about FreeBSD's TCP/IP and SMP locking Message-ID: <410D300F.5080102@mac.com> In-Reply-To: <20040731194337.37249.qmail@web51802.mail.yahoo.com> References: <20040731194337.37249.qmail@web51802.mail.yahoo.com>
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Patrick Dung wrote:
> I am not programmer but I want to know what is the use
> of adding so much locks/mutex in the stack?
So that it works properly under SMP.
Concurrent programming is really hard to do.
> Also, would it make a newbie/beginner feel difficult to
> understand the code (I mean the TCP/IP part)?
Why, yes, certainly it does. Beyond that, the size of the code involved
implies something about the complexity:
8-epia# wc -l /usr/src/sys/netinet/tcp_input.c
3349 /usr/src/sys/netinet/tcp_input.c
--
-Chuck
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