Fiber Resume Coordination Report

Resume a fiber to read the checkpoint it reports and label the reached stage.

Fiber Resume Coordination Report

fiber_resume_coordination_report.rb

checkpoint = 
labels = ["first", "second", "done"]
sequence = Fiber.new do
  Fiber.yield(labels.fetch(checkpoint - 1))
  "closed"
end

reached = sequence.resume
alive = sequence.alive?
status = reached

puts "checkpoint=#{checkpoint}"
puts "reached=#{reached}"
puts "alive=#{alive}"
puts "status=#{status}"

checkpoint = 
labels = ["first", "second", "done"]
sequence = Fiber.new do
  Fiber.yield(labels.fetch(checkpoint - 1))
  "closed"
end

reached = sequence.resume
alive = sequence.alive?
status = reached

puts "checkpoint=#{checkpoint}"
puts "reached=#{reached}"
puts "alive=#{alive}"
puts "status=#{status}"

checkpoint = 
labels = ["first", "second", "done"]
sequence = Fiber.new do
  Fiber.yield(labels.fetch(checkpoint - 1))
  "closed"
end

reached = sequence.resume
alive = sequence.alive?
status = reached

puts "checkpoint=#{checkpoint}"
puts "reached=#{reached}"
puts "alive=#{alive}"
puts "status=#{status}"

fiber resume `Fiber#resume` runs a fiber until its `Fiber.yield` and returns the yielded value, so resuming the fiber reads the checkpoint it reports for the selected stage while the fiber stays suspended and no background work keeps running.