[Mono-dev] TCP Async

Greg Young gregoryyoung1 at gmail.com
Tue Jul 17 11:49:34 UTC 2012

Hey all.

As this is a big issue for us and I feel a huge problem for mono in general
at this point as it means sockets basically dont work which is a strong
point of unix environments, I would like to propose something I have done
in the past. I am willing to offer a bounty (personally) for a working fix
to this section of code of $500 usd (more if done quickly).

Acceptance criteria is the included test working in a stable fashion in
Linux / bsd but just Linux is acceptable as well,

I honestly wish more people would do this kind of thing with OSS projects.



On Saturday, July 7, 2012, Yuriy Solodkyy wrote:

> Hi Rodrigo,
> please find a small sample app at
> https://github.com/ysw/mono-socket-problem
> This app can start in either server or client mode.  These modes only
> differ in whether it listens for connections on multiple ports or
> connects to server on multiple ports. Upon connecting to or accepting
> connection it immediately sends some data, and then sends next chunk
> of data in response to any data received from the other side.  There
> are some random delays in code and we limit outgoing traffic on each
> connection not to be significantly higher than inbound.
> There is also a separate thread which regularly checks status of every
> connection and report any connections that are awaiting a callback,
> but their status obtained with socket.poll is already READY.  (A
> several seconds delay is still allowed).
> See also the README file.
> Also, it seems that constantly changing men/max threads in ThreadPool
> increases probability of the problem. See code.
> Please let me know if this sample app works for you.
> Hope it helps
> Thank you,
> Yuriy
> We've been aware of such issues, could you file a bug and attach a test
> case with it please?
> This would really really help us fix it.
> On Wed, Jun 27, 2012 at 4:08 AM, Greg Young <gregoryyoung1 at gmail.com>
> wrote:
> > We are experiencing an issue with async behaviours in sockets (with
> > SendAsync/callback not Begin/End).
> >
> > Our visible issue is that when in a send loop we will fail on our
> > heartbeats. After debugging and counting calls into/out of
> > SendAsync/callback we see that we are inside of a call to SendAsync
> > (eg: it never returns, in our case for 10 seconds before we declare
> > the socket dead). We can duplicate this fairly regularly on
> > mac/bsd/linux though its nonconsistent (sometimes it may happen
> > repeatedly other times it works fine). The code does not have such
> > issues on MS CLR. We are also running on loopback so its unlikely that
> > an underlying network problem is causing the hang up. The code itself
> > is fairly straight forward (not that different than the MS example of
> > the API except that its fully async (separate send/receive loops while
> > the example is request/response))
> >
> > I am pulling sources now to build latest but does anyone happen to
> > know of known issues with this sort of thing?
> >
> > Cheers,
> >
> > Greg
> >
> > --
> > Le doute n'est pas une condition agréable, mais la certitude est absurde.
> > _______________________________________________
> > Mono-devel-list mailing list
> > Mono-devel-list at lists.ximian.com
> > http://lists.ximian.com/mailman/listinfo/mono-devel-list
> >
> --
> Yuriy Solodkyy
> (y.solodkyy at gmail.com <javascript:;>)
> _______________________________________________
> Mono-devel-list mailing list
> Mono-devel-list at lists.ximian.com <javascript:;>
> http://lists.ximian.com/mailman/listinfo/mono-devel-list

Le doute n'est pas une condition agréable, mais la certitude est absurde.
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