Date: Wed, 13 Nov 2002 07:47:09 -0800 (PST) From: Robert Watson <rwatson@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_mac.c Message-ID: <200211131547.gADFl9QA038342@repoman.freebsd.org>
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rwatson 2002/11/13 07:47:09 PST
Modified files:
sys/kern kern_mac.c
Log:
Introduce a condition variable to avoid returning EBUSY when
the MAC policy list is busy during a load or unload attempt.
We assert no locks held during the cv wait, meaning we should
be fairly deadlock-safe. Because of the cv model and busy
count, it's possible for a cv waiter waiting for exclusive
access to the policy list to be starved by active and
long-lived access control/labeling events. For now, we
accept that as a necessary tradeoff.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories
Revision Changes Path
1.67 +52 -29 src/sys/kern/kern_mac.c
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