Bug #6117: Transfers allowed into Fibers that have resumed into other fibers

[Logan Bowers]

=begin
Consider the following code:

require 'fiber'

def foo
order = []
mainfiber = Fiber.current
a = Fiber.new do
order << 2
x = Fiber.new do
order << 4
mainfiber.transfer
order << 6
end
order << 3
x.resume
order << 7
end

order << 1
a.transfer
order << 5
a.transfer
order << 8

end

It produces output:
[1, 2, 3, 4, 5, 7, 8]

Note: the missing 6. I'd expect either the array to be 1-8 OR for an exception to be raised after 5 when the main fiber attempts to transfer into a again.

Either it shouldn't be possible to transfer into a Fiber that is blocked resuming another Fiber, OR it should automatically resume the sub-Fiber.
=end

[Kenta Murata]

• Assignee set to Koichi Sasada

[Shyouhei Urabe]

• Status changed from Open to Assigned

[Koichi Sasada]

• Target version set to 2.0.0

Please give me a time.

[Koichi Sasada]

Exception seems good.
transfer' andresume' should not be mix.

Any volunteer?
or it will be tagged `next minor'.

[Koichi Sasada]

Any volunteers?

[Koichi Sasada]

• Target version changed from 2.0.0 to next minor

no volunteer.