[Glass] Stop a Gem running an endless FFI loop

James Foster James at JGFoster.net
Wed May 5 15:39:43 PDT 2021

Once you “fork” a string or block in GsExternalSession, the appropriate way to interrupt the Smalltalk code is with a break. Look for GsExternalSession>>#’softBreak’. After that you need to check for a result and get the result. Once the execution finishes (with an answer or an exception, including a break), then you can send another request or logout.


> On May 5, 2021, at 3:15 PM, Bruno Buzzi Brassesco via Glass <glass at lists.gemtalksystems.com> wrote:
> Dale,
> Actually is a Smalltalk loop but each iteration calls a FFI function, that maybe does or does NOT return.
> regards,
> bruno
> El mié, 5 may 2021 a las 19:00, Dale Henrichs (<dale.henrichs at gemtalksystems.com <mailto:dale.henrichs at gemtalksystems.com>>) escribió:
> Bruno,
> Here's the response from engineering:
>   If you have hot loop in C code called from the FFI ,
>   you will have to  use either kill -TERM or kill -9 .
> We plan to talk over possible new features later this week ...
> Dale
> On May 5 2021, at 12:13 pm, Bruno Buzzi Brassesco via Glass <glass at lists.gemtalksystems.com <mailto:glass at lists.gemtalksystems.com>> wrote:
> Hi,
> GS: 337
> Which is the best way to stop a Gem running an endless FFI loop ?
> Let's say Gem1 starts Gem2 that runs the FFI loop.
> The FFI Gem2 is started like (inside Gem1):
> s := GsExternalSession new.
> s username: 'xx'; password: 'xx'; login.
> s forkString: 'FFI endless loop here'.
> So far so good..
> But when i try to stop it with:
> System stopSession: s sessionId. (in Gem1)
> the command: netstat -lpn | grep 6060 - it shows the gem still running on that port. So Gem2 still running
> Gem2 only ends if I logout from Gem1.
> Also tried to use #forceLogout but sometime works fine but other answer the following error:
> 'session with stone session ID of 127 still present 20 seconds after logout'
> And last question is:
> Which is the difference between GsExternalSessio>>sessionId and  GsExternalSession>>stoneSessionId ?
> Right now the kill is done with:
> System performOnServer: 'kill -9 ' , s gemProcessId printString
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