Method: Concurrent::Promise#fail

Defined in:

lib/concurrent-ruby/concurrent/promise.rb

#fail(reason = StandardError.new) ⇒ IVar

Set the ‘IVar` to failed due to some error and wake or notify all threads waiting on it.

Parameters:

• reason (Object) (defaults to: StandardError.new) —

  for the failure

Returns:

• (IVar) —

  self

Raises:

• (Concurrent::MultipleAssignmentError) —

  if the ‘IVar` has already been set or otherwise completed

• (Concurrent::PromiseExecutionError) —

  if not the root promise

# File 'lib/concurrent-ruby/concurrent/promise.rb', line 278

def fail(reason = StandardError.new)
  set { raise reason }
end