From c29681a7777d85e715d0f7c28ce57256abee76e5 Mon Sep 17 00:00:00 2001
From: greg7mdp <greg7mdp@gmail.com>
Date: Wed, 6 Aug 2025 10:07:58 -0400
Subject: [PATCH] Use `UniqueLock` in `extract()` instead of `SharedLock`.
 issue #280.

---
 parallel_hashmap/phmap.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/parallel_hashmap/phmap.h b/parallel_hashmap/phmap.h
index 39c55ac..48e53ab 100644
--- a/parallel_hashmap/phmap.h
+++ b/parallel_hashmap/phmap.h
@@ -3559,8 +3559,8 @@ public:
         class K = key_type,
         typename std::enable_if<!std::is_same<K, iterator>::value, int>::type = 0>
     node_type extract(const key_arg<K>& key) {
-        SharedLock m;
-        auto it = this->template find<K, SharedLock>(key, this->hash(key), m);
+        UniqueLock m;
+        auto it = this->template find<K, UniqueLock>(key, this->hash(key), m);
         return it == end() ? node_type() : extract(const_iterator{it});
     }