cvs commit: src/sys/kern kern_mutex.c subr_turnstile.c src/sys/sys turnstile.h

[John Baldwin]

On Friday 27 January 2006 17:42, John Baldwin wrote:
> jhb         2006-01-27 22:42:12 UTC
>
>   FreeBSD src repository
>
>   Modified files:
>     sys/kern             kern_mutex.c subr_turnstile.c
>     sys/sys              turnstile.h
>   Log:
>   - Add a new ddb command 'show turnstile' that will look up the turnstile
>     associated with the given lock argument and display useful information
>     like the list of threads blocked on each queue, etc.  If there isn't an
>     active turnstile for a lock at the specified address, then the function
>     will see if there is an active turnstile at the specified address and
>     display info about it if so.

Sample output (from a reader/writer lock):

db> show lock foo
 class: rw
 name: foo
 state: WLOCK: 0xc473ac00 (tid 100072, pid 53, "crash2: 3")
 waiters: readers and waiters
db> show turnstile foo
Lock: 0xc476a7c0 - (rw) foo
Lock Owner: 0xc473ac00 (tid 100072, pid 53, "crash2: 3")
Shared Waiters:
        0xc473a780 (tid 100075, pid 50, "crash2: 0")
Exclusive Waiters:
        0xc473aa80 (tid 100073, pid 52, "crash2: 2")
        0xc473a900 (tid 100074, pid 51, "crash2: 1")
Pending Threads:
        empty

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org