Re: [Chicken-users] multi-threading bug in udp egg?

[David Janssens]

ah yes, that works for me. excellent, thanks.

(I should read the docs more carefully really)

 

David
 

On 11/13/05, Daishi Kato <address@hidden> wrote:

Try using udp-open-socket* instead of udp-open-socket?

Hope this helps,
Daishi

At Sun, 13 Nov 2005 00:42:18 +0100,
David Janssens wrote:
>
> Hello,
>
> I think I found a bug in the udp module.
> Consider the following short program:
>
> (require 'srfi-18 'udp)
>
> (define (read-packets)
>   (let loop ()
>     (let ((s (udp-open-socket)))
>       (udp-bind! s #f 6666)
>       (receive (n data) (udp-recv s 2048)
>         (print "packet received"))
>       (loop))))
>
> (thread-start! (make-thread read-packets 'read-packets))
>
> (let loop ()
>   (thread-sleep! 5)
>   (print "beep")
>   (loop))
>
> The result of running this program with debugging output from scheduler.scm
> is:
>
> DBG: #<thread: primordial> blocks for 5328
> DBG: scheduling, current: #<thread: primordial>, ready: (#<thread:
> read-packets>)
> DBG: timeout (328) list: ((5328 . #<thread: primordial>))
> DBG:   #<thread: primordial> -> 5328
> DBG: switching to #<thread: read-packets>
>
> Obviously, there is a bug, since I would expect the message "beep" to be
> printed every 5 secs, independently of the read-packets thread. In this case,
> the udp-recv call seems to block everything.
>
> I am running chicken 2.2 on cygwin (couldn't test on linux, sorry)
>
> David Janssens
>
>