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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 5 Oct 2004 18:00:30 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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Subject: cvs commit: src/sys/kern subr_turnstile.c
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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