--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/putSynchronizedQueue.cbc	Tue Sep 08 18:38:08 2020 +0900
@@ -0,0 +1,17 @@
+__code putSynchronizedQueue(struct SynchronizedQueue* queue, union Data* data, __code next(...)) {
+    Element* element = new Element();
+    element->data = data;
+    element->next = NULL;
+    Element* last = queue->last;
+    Element* nextElement = last->next;
+    if (last != queue->last) {
+        goto putSynchronizedQueue();
+    }
+    if (nextElement == NULL) {
+        struct Atomic* atomic = queue->atomic;
+        goto atomic->checkAndSet(&last->next, nextElement, element, next(...), putSynchronizedQueue);
+    } else { // wrong last element
+        struct Atomic* atomic = queue->atomic;
+        goto atomic->checkAndSet(&queue->last, last, nextElement, putSynchronizedQueue, putSynchronizedQueue);
+    }
+}