--- a/src/parallel_execution/context.h	Wed Dec 20 22:09:17 2017 +0900
+++ b/src/parallel_execution/context.h	Thu Dec 21 00:07:27 2017 +0900
@@ -133,15 +133,15 @@
         struct Queue* wait; // tasks waiting this dataGear
     } Meta;
     struct Context Context;
-    struct Time {
-        union Data* time;
+    struct Timer {
+        union Data* timer;
         enum Code start;
         enum Code end;
         enum Code next;
-    } Time;
-    struct TimeImpl {
+    } Timer;
+    struct TimerImpl {
         double time;
-    } TimeImpl;
+    } TimerImpl;
     struct LoopCounter {
         int i;
     } LoopCounter;