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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 25 Apr 2006 20:28:18 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/kern subr_turnstile.c
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jhb         2006-04-25 20:28:18 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_turnstile.c 
  Log:
  Add some new commands to hopefully make it easier to diagnose lock-related
  problems in ddb:
  - "show threadchain [thread]" will start with the specified thread (or the
    current kdb thread by default) and show it's state.  If it is blocked on
    a lock, it will find the owner of the lock and show its state, etc.
  - "show allchains" will find all of the threads that are blocked on a
    lock (but do not have any threads blocked on a lock they hold) and show
    the resulting thread chain.
  - "show lockchain <lock>" takes a pointer to a lock_object (such as a
    mutex or rwlock).  If there is a turnstile for that lock, then it will
    display all the threads blocked on the lock.  In addition, for each
    thread blocked on the lock, it will display any contested locks they
    hold, and recurse on those locks to show any threads blocked on those
    locks, etc.
  
  Revision  Changes    Path
  1.160     +138 -0    src/sys/kern/subr_turnstile.c