I have no idea about the exact implementation...

On *nix besides True64 and on Windows there are threads started for

- system devspace (on 7.3) (2 threads)
- data devspace (2 threads)
- log devspace (2 threads)
- vtrace (1 thread)

On True64 and windows only one thread is started and this one uses the
syscalls of the os.

The I/O is controlled via the parameters

_IOPROCS_PER_DEV (1 on True64 and Win, >=2 on all others)

and _IOPROCS_SWITCH

That's all I can tell... if you like to dig deeper use the sources ;-)


Greetings,

-- 
Markus Doehr                         SIEGENIA-AUBI KG
CCC - SAP R/3 Basis, SAPDB-DBA     Zum Grafenwald
fon: +49 6503 917 152              D-54411 Hermeskeil
fax: +49 6503 917 190              http://www.siegenia-aubi.com
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