From: eregontp@... Date: 2020-11-20T19:08:08+00:00 Subject: [ruby-core:100989] [Ruby master Feature#17331] Let Fiber#raise work with transferring fibers Issue #17331 has been updated by Eregon (Benoit Daloze). This new alternative sounds good to me. I also commented on the PR. ---------------------------------------- Feature #17331: Let Fiber#raise work with transferring fibers https://bugs.ruby-lang.org/issues/17331#change-88655 * Author: nevans (Nicholas Evans) * Status: Open * Priority: Normal ---------------------------------------- It would be useful to use `raise` on transferring fibers just as we can with yielding fibers. I've added a `transfer` kwarg, so it is not automatic; the caller must know how to handle the fiber. If you call a yielding fiber with `transfer: true` or a transferring fiber without `transfer: true`, a `FiberError` will be raised. Resuming fibers still raise a `FiberError`. ```ruby yielding_fiber.raise "message" # => resumes and raises from the last Fiber.yield transferring_fiber.raise "message", transfer: true # => transfers and raises from the last fiber.transfer resuming_fiber.raise "message" # => raises FiberError ``` Implementation: https://github.com/ruby/ruby/pull/3783 I also implemented a second version that implicitly and automatically selects `rb_fiber_transfer_kw` for transferring fibers and `rb_fiber_resume_kw` for yielding fibers. The implicit version also raises `FiberError` on resuming fibers. ```ruby yielding_fiber.raise "message" # => resumes and raises from the last Fiber.yield transferring_fiber.raise "message" # => transfers and raises from the last fiber.transfer resuming_fiber.raise "message" # => raises FiberError ``` Alternate implicit implementation: https://github.com/ruby/ruby/pull/3795 I slightly prefer the explicit version, but I'm okay with the implicit version. -- https://bugs.ruby-lang.org/ Unsubscribe: