How is smp handled in file services?

[Trevor Higgins <plan9fullfrontal@qs.co.nz>]

Just trying ti understand the data flow through the kernel (as compared 
to *nix).

Given the following easy to understand example:

Assume that three processes are writing to /dev/audio through the mixfs 
file server. Given that all processes are on the same terminal server, 
and that there are ample idle cpu cores (ignore locking and other side 
effects), what is the data flow path in mixfs:

    1. All three procs sleep while some proc processes the write 
requests sequentially, returning the results sequentially.

    2. All three procs enter the file service and process one request 
concurrently and return result directly to own process.

I am assuming that unless designed specifically in the file server, that 
the answer is 1.


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