Threads which have blocked Fibers are not killable

[halorgium]

It seems that a Thread which is running a Fiber and that Fiber is blocked on a Queue#pop is unkillable via Thread#kill.

repro

@headius mentioned that it should be possible to kill the Thread's current Fiber.
@dbussink wrote a rubyspec for this recently. rubinius/rubinius@9efac8a

/cc @tarcieri rubinius/rubinius#2392

[halorgium]

This is somewhat related to the "Thread.current does not remain consistent between Fibers" bug.

I have been toying with killing all the Threads which are backing the Fibers.

[halorgium]

Killing the Thread.current which is for the Fiber before killing the root Fiber's Thread allows the Thread to die.

[MSNexploder]

Repro works just as expected on JRuby 9.1.2.0

[enebo]

Confirmed this is working in 9.x and 1.7.x is EOL. Resolving against a release so it shows up.