Re: kthread_create and rel_mplock

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Michael Neumann wrote:
> If I understand the kthread_create correctly, it will always acquire the
> mplock (something like a global lock). That means, if I create two
> threads, they will automatically be serialized (i.e. run sequentially),
> unless I release the lock within a thread manually. Is that correct?

kthread_* is old stuff and should be avoided.  If possible, use lwkt_*. 
These threads then run without process context and without the mplock.

> Is mtx_lock(&Giant) equivalent to the mplock on DragonFly?

Yes, I think so.

> My understanding is that it is equivalent, and that I don't need any
> further critical sections.

You do, to prevent from interrupts happening on the same CPU.  Other BSDs 
use(d) spl* for this purpose, we have crit_*.

cheers
  simon

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