From 8fc650a81fc9195f17d5c0f15c5856394164dcbc Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sun, 21 Jun 2026 08:16:26 +0000
Subject: [PATCH] fix: #101 guard atomic shutdown hook with locked flag

Skip the unlock call when the lock was never acquired, so a JVM exit during the acquisition wait or after a thrown lock() or sleep() no longer releases another holder's lock through the empty default label.
---
 src/main/java/co/stateful/Atomic.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/co/stateful/Atomic.java b/src/main/java/co/stateful/Atomic.java
index c66e77e..f48b967 100644
--- a/src/main/java/co/stateful/Atomic.java
+++ b/src/main/java/co/stateful/Atomic.java
@@ -122,6 +122,9 @@ public Atomic(final Callable<T> clbl, final Lock lck, final String lbl,
     public T call() throws Exception {
         final Thread hook = new Thread(
             () -> {
+                if (!this.locked.get()) {
+                    return;
+                }
                 try {
                     this.lock.unlock(this.label);
                 } catch (final IOException ex) {