Date: Tue, 5 Oct 2004 18:00:30 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern subr_turnstile.c Message-ID: <200410051800.i95I0UQJ066525@repoman.freebsd.org>
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jhb 2004-10-05 18:00:30 UTC
FreeBSD src repository
Modified files:
sys/kern subr_turnstile.c
Log:
Add a critical section in turnstile_unpend() from before dropping the
turnstile chain lock until after making all the awakened threads
runnable. First, this fixes a priority inversion race. Second, this
attempts to finish waking up all of the threads waiting on a turnstile
before doing a preemption.
Reviewed by: Stephan Uphoff (who found the priority inversion race)
Revision Changes Path
1.149 +2 -0 src/sys/kern/subr_turnstile.c
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