Date: Sun, 03 Oct 2004 14:39:30 -0700 From: Julian Elischer <julian@elischer.org> To: Stephan Uphoff <ups@tree.com> Cc: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: scheduler (sched_4bsd) questions Message-ID: <41607192.8020809@elischer.org> In-Reply-To: <1096828937.38592.52.camel@palm.tree.com> References: <1096489576.3733.1868.camel@palm.tree.com> <200409291652.29990.jhb@FreeBSD.org> <1096496057.3733.2163.camel@palm.tree.com> <1096603981.21577.195.camel@palm.tree.com> <1096608201.21577.203.camel@palm.tree.com> <20041001141040.GA1556@peter.osted.lan> <1096647194.27811.12.camel@palm.tree.com> <20041001192551.GA3381@peter.osted.lan> <20041002053351.GA6259@peter.osted.lan> <415EEFFE.5080309@elischer.org> <20041002183120.GA1202@peter.osted.lan> <1096760257.34527.14.camel@palm.tree.com> <415FA496.6000902@elischer.org> <1096828937.38592.52.camel@palm.tree.com>
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Stephan Uphoff wrote:
you didn't answer this question..
>
>
>>Where is the critical_enter that matches the extra critical_exit()
>>you put in sched_switch()? I haven' been able to yet figure out how
>>you don't get a double exit. but I've only looked for a few minutes.
>
==== //depot/projects/nsched/sys/kern/sched_4bsd.c#58 -
/home/julian/p4/nsched/sys/kern/sched_4bsd.c ====
@@ -844,6 +844,8 @@
if (newtd == NULL || newtd->td_ksegrp != td->td_ksegrp)
slot_fill(td->td_ksegrp);
}
+ critical_exit();
+ td->td_pflags &= ~TDP_OWEPREEMPT;
}
if (newtd) {
/*
where is the matching critical_enter()?
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