import from drb-2.0.4b3

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3959 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/drb/invokemethod.rb

@@ -0,0 +1,39 @@
+
+# for ruby-1.8.0
+
+module DRb
+  class DRbServer
+    module InvokeMethod18Mixin
+      def block_yield(x)
+        block_value = @block.call(*x)
+      end
+      
+      def rescue_break(err)
+        return :break, err.exit_value
+      end
+      
+      def perform_with_block
+        @obj.__send__(@msg_id, *@argv) do |*x|
+          jump_error = nil
+          begin
+            block_value = block_yield(x)
+          rescue LocalJumpError
+            jump_error = $!
+          end
+          if jump_error
+            reason, jump_value = rescue_local_jump(jump_error)
+            case reason
+            when :retry
+              retry
+            when :break
+              break(jump_value)
+            else
+              raise jump_error
+            end
+          end
+          block_value
+        end
+      end
+    end
+  end
+end