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tjp/core/threads/LockedBy.hpp

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+// License: Modified MIT (NON-AI)
+// See the LICENSE file in the root directory for license information.
+// Copyright 2025 Timothy Prepscius
+
+#pragma once
+
+#include "LockedBy.h"
+#include <thread>
+
+namespace tjp::core {
+
+template<typename T>
+class LockedBy
+{
+public:
+	T m;
+
+    void lock()
+    {
+		m.lock();
+		if (++rentry == 1)
+			m_holder = std::this_thread::get_id();
+    }
+    
+    bool try_lock()
+    {
+		auto locked = m.try_lock();
+		if (locked)
+		{
+			if (++rentry == 1)
+				m_holder = std::this_thread::get_id();
+		}
+		
+		return locked;
+	}
+
+    void unlock()
+    {
+		if (--rentry == 0)
+			m_holder = {};
+		m.unlock();
+    }
+
+    /**
+    * @return true iff the mutex is locked by the caller of this method. */
+    bool locked_by_caller() const
+    {
+        return m_holder == std::this_thread::get_id();
+    }
+
+private:
+	size_t rentry = 0;
+    std::thread::id m_holder;
+};
+
+} // namespace