Date: Wed, 01 Jul 1998 00:02:49 -0700 From: David Greenman <dg@root.com> To: sja@world.std.com (Stuart J Adams) Cc: freebsd-questions@FreeBSD.ORG Subject: Re: splnet, splx and tsleep Message-ID: <199807010702.AAA01024@implode.root.com> In-Reply-To: Your message of "Tue, 30 Jun 1998 15:00:56 EDT." <199806301900.AA29089@world.std.com>
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>I am trying to understand the exact effects >of splnet and splimp in the kernel. > >When running at splnet/splimp a process >cannot be preempted out due to time slicing >right ??? A process can't be preempted due to scheduling when running anywhere in the kernel. >what happens when tsleep is called while >at splnet ??? This happens in the accept >system call, the system can't be left at >the splnet priority level until a connection >is made. How does tsleep effect the current >spl ??? The spl prior to the sleep is saved, spl0 (splnone) is set, and another process is scheduled. The spl will be restored later when the wakeup occurs. >Is there a good explanation on the net or in >book about these kernel architectural issues ??? Kirk's book is usually a good reference. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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