Detecting image (pharo process) hang?

> On Wed, Jun 3, 2015 at 11:51 AM, David
> <[hidden email]> wrote:
>
> > I am making a little watchdog (in C++) for spawning forked pharo
> > image processes and detecting when they crash (for ex, memory
> > exhausted and/or killed) so it can restart the image.
> >
> > It works, but for now I have only 1 remaining thing:
> >
> > How can I detect from outside, when pharo process is hanged and not
> > responsive?
> >
> > I am thinking something like sending SIGUSR1 (which should output a
> > backtrace) and if nothing is produced, then kill the pid.
> >
> > The problem is that when I do so, then image is completelly
> > unresponsive (all is blank and not responsive to any event, click
> > and so).
> >
> > Is there anything better?
> >
> >
> >
> Install minimal http server into image, and query it for basic health
> information?
>
> Davorin Rusevljan
> http://www.cloud208.com/
>

> On 03-06-15 12:07, David wrote:
> > That could work, but can be time expensive. I already have seaside
> > installed (and I am using that) so I may try that.
> >
> > The only problem I see if that if the image is stalled, it can pass
> > more time than desired until it times out the http connection.
>
> Add a keep-alive server, sending an UDP packet every so often?
>
> Stephan
>
>
>
>