Hi,
It's a bug in the socket egg; nonblocking mode is only set during a
socket-connect or socket-accept, which won't be called for UDP.
Temporary workaround: (use posix) and then, after creating the socket, do
either:
(##sys#file-nonblocking! (socket-fileno *socket*))
or equivalently
(file-control fcntl/setfl (socket-fileno *socket*)
(bitwise-ior (file-control fcntl/getfl (socket-fileno *socket*))
open/nonblock))
Neither workaround will work on Windows.
Permanent fix: We should probably make all sockets nonblocking at creation time
instead, since our machinery assumes nonblocking sockets. We could expose the
set-nonblocking operation to the user, but since TCP is always nonblocking,
doing this only for UDP would be strange. Thoughts?
Jim
On Jun 14, 2013, at 11:01 AM, Kristian Lein-Mathisen <kristianl...@gmail.com>
wrote:
>
> Hi Chickeners!
>
> I have come across a problem with multiple srfi-18 threads when tryping to
> listen to UDP sockets:
>
> (use socket)
> (set! *socket* (socket af/inet sock/dgram ))
> (set! (so-reuse-address? *socket*) #t)
> (socket-bind *socket* (inet-address "0.0.0.0" 5055))
> ;; (socket-receive ..) here blocks the prints below
> ;; after 1 s (about 10 hello's)
> (thread-start! (lambda ()
> (thread-sleep! 1)
> (print "receiving ...")
> (print (socket-receive *socket* 1024))
> (print "done")))
>
> (let loop ()
> (print "hello from main-thread!")
> (thread-sleep! .1)
> (loop))
>
> ;; the hello's from the main thread continue after sending a udp packet:
> ;; $ echo test `date` | socat - UDP-DATAGRAM:127.0.0.1:5055,broadcast
>
>
> The documentation for socket clearly states that socket-receive should not
> block:
> This call will block until data is available, but other threads can proceed.
>
> What is wrong with my socket fd?
>
> K.
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