transfer

Transfer control to another fiber, resuming it from where it last stopped or starting it if it was not resumed before. The calling fiber will be suspended much like in a call to Fiber.yield. You need to require ‘fiber’ before using this method.

The fiber which receives the transfer call is treats it much like a resume call. Arguments passed to transfer are treated like those passed to resume.

You cannot resume a fiber that transferred control to another one. This will cause a double resume error. You need to transfer control back to this fiber before it can yield and resume.

Example:

fiber1 = Fiber.new do
  puts "In Fiber 1"
  Fiber.yield
end

fiber2 = Fiber.new do
  puts "In Fiber 2"
  fiber1.transfer
  puts "Never see this message"
end

fiber3 = Fiber.new do
  puts "In Fiber 3"
end

fiber2.resume
fiber3.resume

produces

In fiber 2
In fiber 1
In fiber 3