######################################################################### Same as a regular task, but the immediate prerequisites are done in parallel using Ruby threads.

Methods
Public Instance methods
invoke_prerequisites(args, invocation_chain)
     # File lib/rake.rb, line 809
809:     def invoke_prerequisites(args, invocation_chain)
810:       threads = @prerequisites.collect { |p|
811:         Thread.new(p) { |r| application[r].invoke_with_call_chain(args, invocation_chain) }
812:       }
813:       threads.each { |t| t.join }
814:     end