Fix: shared_lock_gt for C++11

unum-cloud · Aug 22, 2023 · 0a1c978 · 0a1c978
1 parent 4570ee3
commit 0a1c978
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/include/usearch/index_dense.hpp b/include/usearch/index_dense.hpp
@@ -330,7 +330,7 @@ class index_dense_gt {
     mutable std::mutex available_threads_mutex_;
 
     using shared_mutex_t = unfair_shared_mutex_t;
-    using shared_lock_t = std::shared_lock<shared_mutex_t>;
+    using shared_lock_t = shared_lock_gt<shared_mutex_t>;
     using unique_lock_t = std::unique_lock<shared_mutex_t>;
 
     struct key_and_slot_t {

diff --git a/include/usearch/index_plugins.hpp b/include/usearch/index_plugins.hpp
@@ -905,6 +905,14 @@ class unfair_shared_mutex_t {
     }
 };
 
+template <typename mutex_at = unfair_shared_mutex_t> class shared_lock_gt {
+    mutex_at& mutex_;
+
+  public:
+    inline explicit shared_lock_gt(mutex_at& m) noexcept : mutex_(m) { mutex_.shared_lock(); }
+    inline ~shared_lock_gt() noexcept { mutex_.shared_unlock(); }
+};
+
 /**
  *  @brief  Utility class used to cast arrays of one scalar type to another,
  *          avoiding unnecessary conversions.