--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/parallel_execution/twice.cbc	Thu Feb 02 18:29:50 2017 +0900
@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+#include "context.h"
+#include "origin_cs.h"
+
+__code twice(struct Context* context, struct LoopCounter* loopCounter, int index, int prefix, int* array, struct Context* workerContext) {
+    int i = loopCounter->i;
+    if (i < prefix) {
+        array[i+index*prefix] = array[i+index*prefix]*2;
+        loopCounter->i++;
+
+        goto meta(context, C_twice);
+    }
+
+    loopCounter->i = 0;
+    goto meta(workerContext, workerContext->next);
+}
+
+__code twice_stub(struct Context* context) {
+    struct Context* workerContext = context->worker->worker->CPUWorker.context;
+    goto twice(context, Gearef(context, LoopCounter), 0, 0, NULL, workerContext);
+}