Missing rump_kthread_destroy() ?

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

In my on-going efforts to further modularize the NetBSD kernel, I'm 
currently prying apart the pieces of sysmon...

One of those pieces would be sysmon_taskq, which provides a lwp 
environment to execute callouts.  In the sysmon_taskq_init() routine 
there is a call to kthread_create(), so it would seem reasonable that 
sysmon_taskq_fini() would call kthread_destroy().

Unfortunately, when building rump_allserver I discover that there is no 
rump emulation for kthread_destroy().  There is _create(), _join(), 
_exit(), and _init(), but no _destroy().

Is there a reason for not providing kthread_desetroy()?  How difficult 
would it be to add it?

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