Ractor#monitor

Registers the port as a monitoring port for this ractor. When the ractor terminates, the port receives a Symbol object.

• :exited is sent if the ractor terminates without an unhandled exception.

• :aborted is sent if the ractor terminates by an unhandled exception.

  Example

  Run in Playground

  r = Ractor.new{ some_task() }
  r.monitor(port = Ractor::Port.new)
  port.receive #=> :exited and r is terminated
  
  r = Ractor.new{ raise "foo" }
  r.monitor(port = Ractor::Port.new)
  port.receive #=> :aborted and r is terminated by the RuntimeError "foo"