I hope it's not too specific in my setup...
I've tried with system2 added on the first line, so:
Example.R:
system2('ls', timeout=5)
cat('Start non-interruptable functions\n')
sample_a <- sample(1:1e7)
sample_b <- sample(1:2e7)
matching <- match(sample_a, sample_b)
cat('Finished\n')
Sys.sleep(10)
And in terminal/bash:
R --vanilla
source('Example.R')
Send ^C between the messages (Start... until Finished)
Or if you have a more powerful CPU you can increase the samples, the exact code
doesn't matter very much.
As soon as you restart and source again with the system2 call outcommented, the
behaviour is different, there is a pause, and your return to the R-prompt.
Best, Emil
On 14/09/2018, 17:39, "luke-tier...@uiowa.edu" <luke-tier...@uiowa.edu> wrote:
I can't reproduce this. Can you be more precise: exactly where are you
putting the system2 call and exactly where are you sending the
interrupt signal with ^C?
Best,
luke
On Fri, 14 Sep 2018, Emil Bode wrote:
> Hi all,
>
> I found some strange behaviour, which I think is a bug. Could someone make
an account for me on Bugzilla or pass on my report?
>
> The problem:
> When pressing Ctrl-C when a file is sourced in R, run from Terminal
(macOS), sometimes the entire session is ended right away, while I just want to
stop the script. This is the case when I press Ctrl-C while some functions are
running that don’t catch the interrupt. However, the behaviour is different
whether I’m in a clean session (in which case some time is allowed to pass, so
that when the function returns the script can be interrupted), or whether I have
called base::system() or system2() with timeout other than 0.
>
> Reproducible example:
> cat('Start non-interruptable functions\n')
> sample_a <- sample(1:1e7)
> sample_b <- sample(1:2e7)
> matching <- match(sample_a, sample_b)
> cat('Finished\n')
> Sys.sleep(10)
>
> Observed behaviour:
> In a clean session, when I hit Ctrl-C during the execution of match, there is
a delay, and as soon as Sys.sleep() is invoked, the script is interrupted, I get back
my R “>”-prompt (unless options(error=…) is set)
> But If I add the line system2("ls", timeout = 5), or something similar,
when I try to break during the first part of the script, my Rsession ends, I get thrown back
to my terminal-prompt.
>
> Desired behaviour:
> The best setup would probably be if Ctrl-C would always try to break from
the sourced file, and only if that doesn’t success in n seconds, break the
rsession altogether, ideally with a customizable option. But maybe that’s too
hard, so maybe the most pragmatic would be to have 2 hotkeys: one to break from a
hanging/broken rsession, and one to gently try to break from a script. But at
least I think it should be:
>
> Expected behaviour:
> Consistent behaviour for Ctrl-C: either trying to break the script, or end
the session altogether.
>
> Some observations:
>
> * I can still break cleanly during the Sys.sleep(). But for larger
scripts, it is largely a matter of luck if I hit Ctrl-C during the right moment.
> * I don’t notice any difference between using system or system2, or any
of the arguments other than timeout provided
> * I don’t notice any difference whether the timeout is actually
exhausted or not.
> * Later calls to system/system2 don’t change anything (i.e. later
calling system(…, timeout=0) does not revert back to the old situation)
>
> My setup:
> R 3.5.1 (Feather Spray), run with –vanilla option
> GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin17)
> macOS High Sierra 10.13.6
>
> Best regards,
> Emil Bode
>
> Data-analyst
>
> +31 6 43 83 89 33
> emil.b...@dans.knaw.nl<mailto:emil.b...@dans.knaw.nl>
>
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--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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