Robert Watson faabfac9ff When entering siocnputc() with (kdb_active), don't acquire (or
release) the sio spin mutex, as use of synchronization primitives in
the debugger can result in substantial problems.  With this patch in
place entering the debugger via a serial console is made
substantially more reliable.

MFC after:	1 week
Tested by:	kris
Discussed with:	bde
2005-02-03 10:35:05 +00:00
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