[Chicken-users] udp egg on win32

[Daishi Kato]

Hi,

Recently, I'm working on win32, and found one thing.
(udp-recvfrom) blocks when it's run in a thread.
Of cource, with a non-blocking socket.

Looking into tcp.scm, I noticed that 
some (##sys#thread-block-for-i/o) are commentted out.
So the same thing is done in udp.scm,
and it worked.

Is it an OK way to go?
What does this do? Why only on win32?

Thanks for your advice,
Daishi