add ThreadedCommand class

lib/rscons.rb

@@ -3,6 +3,7 @@ require_relative "rscons/builder"
 require_relative "rscons/cache"
 require_relative "rscons/environment"
 require_relative "rscons/job_set"
+require_relative "rscons/threaded_command"
 require_relative "rscons/varset"
 require_relative "rscons/version"
 

lib/rscons/threaded_command.rb

@@ -0,0 +1,31 @@
+module Rscons
+  # If a builder returns an instance of this class from its #run method, then
+  # Rscons will execute the command specified in a thread and allow other
+  # builders to continue executing in parallel.
+  class ThreadedCommand
+
+    # @return [Array<String>]
+    #   The command to execute.
+    attr_reader :command
+
+    # @return [Object]
+    #   Arbitrary object to store builder-specific info. This object value will
+    #   be passed back into the builder's #finalize method.
+    attr_reader :builder_info
+
+    # Create a ThreadedCommand object.
+    #
+    # @param command [Array<String>]
+    #   The command to execute.
+    # @param options [Hash]
+    #   Optional parameters.
+    # @option options [Object] :builder_info
+    #   Arbitrary object to store builder-specific info. This object value will
+    #   be passed back into the builder's #finalize method.
+    def initialize(command, options = {})
+      @command = command
+      @builder_info = options[:builder_info]
+    end
+
+  end
+end