cvs commit: src/sys/kern subr_turnstile.c

[John Baldwin]

jhb         2007-09-27 18:39:18 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/kern             subr_turnstile.c 
  Log:
  - Remove some debugging nits in the MFC of rwlocks that looked for cases
    where a reader blocked on a lock with no owner and just assert that it
    never happens like HEAD.
  - Actually set td->td_tsqueue to the sub-queue of a turnstile that a
    thread is actually enqueued to.  Otherwise, the kernel would always
    think that threads were on the queue for exclusive (write) waiters
    (queue 0).  Thus, if the priority of a thread waiting on a read lock
    was adjusted while it was waiting it could result in corrupting the
    queue of waiting threads.
  
  Revision   Changes    Path
  1.152.2.9  +14 -17    src/sys/kern/subr_turnstile.c