diff --git a/flow.h b/flow.h
new file mode 100644
index 0000000..c0a45c3
--- /dev/null
+++ b/flow.h
@@ -0,0 +1,11 @@
+#ifndef FIO_FLOW_H
+#define FIO_FLOW_H
+
+int flow_threshold_exceeded(struct thread_data *td);
+void flow_init_job(struct thread_data *td);
+void flow_exit_job(struct thread_data *td);
+
+void flow_exit(void);
+void flow_init(void);
+
+#endif