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From: Ed Schouten <ed@FreeBSD.org>
Date: Tue, 23 Jun 2009 21:33:26 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/kern tty.c
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ed          2009-06-23 21:33:26 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             tty.c 
  Log:
  SVN rev 194769 on 2009-06-23 21:33:26Z by ed
  
  Use dcdwait to block threads to serialize writes.
  
  I suspect the usage of bgwait causes a lot of spurious wakeups when
  threads are blocked in the background, because they will be woken up
  each time a write() call is performed.
  
  Also wakeup dcdwait when the TTY is abandoned.
  
  Revision  Changes    Path
  1.325     +3 -2      src/sys/kern/tty.c