1 files changed, 0 insertions, 99 deletions
diff --git a/lib/rake/promise.rb b/lib/rake/promise.rb
deleted file mode 100644
index 31c4563476..0000000000
--- a/lib/rake/promise.rb
+++ /dev/null
@@ -1,99 +0,0 @@
-module Rake
-
-  # A Promise object represents a promise to do work (a chore) in the
-  # future. The promise is created with a block and a list of
-  # arguments for the block. Calling value will return the value of
-  # the promised chore.
-  #
-  # Used by ThreadPool.
-  #
-  class Promise               # :nodoc: all
-    NOT_SET = Object.new.freeze # :nodoc:
-
-    attr_accessor :recorder
-
-    # Create a promise to do the chore specified by the block.
-    def initialize(args, &block)
-      @mutex = Mutex.new
-      @result = NOT_SET
-      @error = NOT_SET
-      @args = args
-      @block = block
-    end
-
-    # Return the value of this promise.
-    #
-    # If the promised chore is not yet complete, then do the work
-    # synchronously. We will wait.
-    def value
-      unless complete?
-        stat :sleeping_on, :item_id => object_id
-        @mutex.synchronize do
-          stat :has_lock_on, :item_id => object_id
-          chore
-          stat :releasing_lock_on, :item_id => object_id
-        end
-      end
-      error? ? raise(@error) : @result
-    end
-
-    # If no one else is working this promise, go ahead and do the chore.
-    def work
-      stat :attempting_lock_on, :item_id => object_id
-      if @mutex.try_lock
-        stat :has_lock_on, :item_id => object_id
-        chore
-        stat :releasing_lock_on, :item_id => object_id
-        @mutex.unlock
-      else
-        stat :bailed_on, :item_id => object_id
-      end
-    end
-
-    private
-
-    # Perform the chore promised
-    def chore
-      if complete?
-        stat :found_completed, :item_id => object_id
-        return
-      end
-      stat :will_execute, :item_id => object_id
-      begin
-        @result = @block.call(*@args)
-      rescue Exception => e
-        @error = e
-      end
-      stat :did_execute, :item_id => object_id
-      discard
-    end
-
-    # Do we have a result for the promise
-    def result?
-      ! @result.equal?(NOT_SET)
-    end
-
-    # Did the promise throw an error
-    def error?
-      ! @error.equal?(NOT_SET)
-    end
-
-    # Are we done with the promise
-    def complete?
-      result? || error?
-    end
-
-    # free up these items for the GC
-    def discard
-      @args = nil
-      @block = nil
-    end
-
-    # Record execution statistics if there is a recorder
-    def stat(*args)
-      @recorder.call(*args) if @recorder
-    end
-
-  end
-
-end