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Cannot kill thread with Readline #2841

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e2 opened this issue Apr 16, 2015 · 2 comments
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Cannot kill thread with Readline #2841

e2 opened this issue Apr 16, 2015 · 2 comments
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Invalid or Duplicate

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@e2
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e2 commented Apr 16, 2015

The following never finishes on JRuby (never gets to the final line):

require 'readline'

th = Thread.new { Readline.readline }
th.join(0.5)

Thread.new do
  sleep 2
  th.kill
end

STDERR.puts "continuing in foreground"
th.join # hangs here

STDERR.puts "Never gets here... ;("

Here are 2 relevant threads from a dump: https://gist.github.com/e2/d58ec0374ce58e7c7495

I don't know if this behavior is intended or not (I just want to quit Readline from a different thread).
@e2 e2 mentioned this issue Apr 16, 2015
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@headius
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headius commented Apr 17, 2015

This is a known issue, and in fact there's another bug about it (at least one): #2383

There's currently no way to do readline non-blocking – a requirement for interrupting it – because we use the jline library. It builds off standard JDK stdio objects, which are not interruptible.

See linked issue for more details.

@headius headius closed this as completed Apr 17, 2015
@headius headius added this to the Invalid or Duplicate milestone Apr 17, 2015
@e2
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e2 commented Apr 17, 2015

Thanks! I was searching for "blocking" and "io" in the issues and couldn't find it. Didn't expect Readline to be in the title.

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