1 files changed, 25 insertions, 0 deletions
diff --git a/jrt/src/com/yahoo/jrt/TieBreaker.java b/jrt/src/com/yahoo/jrt/TieBreaker.java
new file mode 100644
index 00000000000..b327328fae6
--- /dev/null
+++ b/jrt/src/com/yahoo/jrt/TieBreaker.java
@@ -0,0 +1,25 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jrt;
+
+
+/**
+ * When multiple actors race to come to a certain point and only one
+ * should be allowed to continue, an object of this class may be used
+ * to settle who should be allowed to continue. Note that external
+ * synchronization is needed if this class is used with multiple
+ * threads.
+ **/
+class TieBreaker {
+    private boolean first = true;
+
+    /**
+     * Are we the first to come here?
+     *
+     * @return true if you are first, false otherwise.
+     **/
+    public boolean first() {
+        boolean ret = first;
+        first = false;
+        return ret;
+    }
+}