2015-08-09 15:24 GMT+02:00 Matthew Flatt <mfl...@cs.utah.edu>:
> Does `(current-subprocess-custodian-mode 'kill)` combined with Cmd-k
> (for kill, instead of break) make the subprocess terminate?
>
Yes.
If so, you could use `dynamic-wind` or catch `exn:break` exceptions,
> possibly put the subprocess under its own custodian, and so on.
Thanks that worked. For the archives:
(define (node/break path)
(define me (current-thread))
(define cust (make-custodian))
(define (kill) (custodian-shutdown-all cust))
(define (on-break _) (kill) "\"break: node process was killed\"")
(parameterize ([current-subprocess-custodian-mode 'kill]
[subprocess-group-enabled #t]
[current-custodian cust])
(with-handlers ([exn:break? on-break])
(thread (λ() (thread-send me (node path))))
(thread-receive))))
/Jens Axel
> At Sun, 9 Aug 2015 15:17:19 +0200, Jens Axel Søgaard wrote:
> > Hi All,
> >
> > The function node below takes the path of a JavaScript file, starts
> > "node" (JavaScript evaluator) using "system". The output is
> > collected in a string.
> >
> > (define (node path)
> > (with-output-to-string
> > (λ ()
> > (system (string-append "/usr/local/bin/node " " "
> (path->string
> > path))))))
> >
> > The function is used from within DrRacket. If the JavaScript program
> doesn't
> > terminate, I use cmd-b to break the process. Control is given back to the
> > repl, but the node system process keeps running in the background - and
> > needs to be killed manually.
> >
> > How can I kill the node system process from within DrRacket?
> >
> > One of my attempts that didn't work:
> >
> > (define (node path)
> > (with-output-to-string
> > (λ ()
> > (parameterize ([current-subprocess-custodian-mode 'kill]
> > [subprocess-group-enabled #t])
> > (system (string-append "/usr/local/bin/node " " "
> > (path->string path)))))))
> >
> > --
> > Jens Axel Søgaard
> >
> > --
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