Double resume in JRuby. Note that the result in JRuby varies so it seems to be time sensitive.

double_resume.rb

require "minitest/autorun"

describe "Resuming Fiber" do
  it "should raise double resume" do
    data = [:a, :b, :c]
    active = true
    fiber = Fiber.new do
      while active do
        data.each {|item| sleep(0.1); Fiber.yield(item)}
      end
    end

    fiber.resume.must_equal :a
    third = nil
    first = Thread.new do
      Thread.stop
      fiber.resume.must_equal :b
    end
    second = Thread.new do
      Thread.stop
      fiber.resume.must_equal :c
    end

    third = Thread.new do
      first.wakeup
      second.wakeup
    end

    first.join
    second.join
    active = false
  end
end

gistfile1.txt

 ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
ruby test/double_resume.rb 
Run options: --seed 62571

# Running tests:

E

Finished tests in 0.102593s, 9.7472 tests/s, 19.4944 assertions/s.

  1) Error:
test_0001_should_raise_double_resume(Resuming Fiber):
FiberError: fiber called across threads
    test/double_resume.rb:27:in `resume'
    test/double_resume.rb:27:in `block (3 levels) in <main>'

1 tests, 2 assertions, 0 failures, 1 errors, 0 skips

JRuby 1.6.7 double resume

ruby -v
jruby 1.6.7 (ruby-1.9.2-p312) (2012-02-22 3e82bc8) (Java HotSpot(TM) 64-Bit Server VM 1.7.0_01) [linux-amd64-java]
ruby test/double_resume.rb 
Loaded suite test/double_resume
Started
E
Finished in 0.157000 seconds.

  1) Error:
test_0001_should_raise_double_resume(ResumingFiberSpec):
FiberError: double resume
    org/jruby/ext/fiber/Fiber.java:64:in `resume'
    test/double_resume.rb:27:in `__file__'

1 tests, 1 assertions, 0 failures, 1 errors, 0 skips

Test run options: --seed 40834

JRuby 1.6.7 yield nil

ruby -v
jruby 1.6.7 (ruby-1.9.2-p312) (2012-02-22 3e82bc8) (Java HotSpot(TM) 64-Bit Server VM 1.7.0_01) [linux-amd64-java]
ruby test/double_resume.rb 
Loaded suite test/double_resume
Started
F
Finished in 0.270000 seconds.

  1) Failure:
test_0001_should_raise_double_resume(ResumingFiberSpec) [test/double_resume.rb:31]:
Expected :c, not nil.

1 tests, 3 assertions, 1 failures, 0 errors, 0 skips

Test run options: --seed 2096