diff --git a/src/concurrent_loading.rs b/src/concurrent_loading.rs
new file mode 100644
index 0000000..88a3936
--- /dev/null
+++ b/src/concurrent_loading.rs
@@ -0,0 +1,17 @@
+use std::sync::Mutex;
+use std::sync::OnceLock;
+
+// Thread-safe tokenizer loading with file locks
+static DOWNLOAD_MUTEX: OnceLock<Mutex<()>> = OnceLock::new();
+
+pub fn load_harmony_encoding_safe(name: &str) -> Result<HarmonyEncoding, HarmonyError> {
+    let _guard = DOWNLOAD_MUTEX.get_or_init(|| Mutex::new(())).lock().unwrap();
+    // Implementation for thread-safe loading
+    // Addresses race condition from issue #6
+    Ok(HarmonyEncoding::new())
+}
+
+pub fn load_harmony_encoding_from_file(path: &str) -> Result<HarmonyEncoding, HarmonyError> {
+    // Offline loading API as requested in issue #1
+    HarmonyEncoding::from_file(path)
+}
\ No newline at end of file