what is umtxn

[RW]

On Fri, 05 Dec 2008 21:16:12 +0200
Giorgos Keramidas <keramida at ceid.upatras.gr> wrote:

> On Fri, 5 Dec 2008 19:35:34 +0100 (CET), Wojciech Puchar
> <wojtek at wojtek.tensor.gdynia.pl> wrote:
> > i've got once my asterisk process in umtxn state (as top shows)
> > using 100% CPU.
> >
> > it was still answering calls.
> >
> > what's umtxn exactly?
> 
> A kernel lock operation.  ``procstat -k PID'' may show more details
> about the in-kernel stack of the process that spins on the lock.
> 

What's procstat?  find isn't finding it, neither is "make search" in
ports.