kernel threads and mplock

[Hidetoshi Shimokawa <simokawa@xxxxxxxxxxxxxxxxxxx>]

Hi,

I have a question about kernel threads synchronization on DFB.
A comment in lwkt_thread.c says:

 * NOTE!  By default new threads are created with the MP lock held.  A
 * thread which does not require the MP lock should release it by calling
 * rel_mplock() at the start of the new thread.
 */

Where can I find an example for thread running without MP lock?
I heard that TCP protocol stack has multiple kernel threads.
Do they actually run concurrently on multiple cpu now?
I can't find where they release MP lock.

It seems that most of the kernel threads are running with MP lock
now. Right?

/\ Hidetoshi Shimokawa
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