Recovered lost code from other libraries

python/singelton.py

@@ -0,0 +1,31 @@
+#
+# Last Change: 2026-03-18
+#
+
+import threading
+
+class Singleton:
+	"""
+		A thread lock protected singleton,
+		makes any inherting class into a singlton.
+
+		The SINGLETON_LOCK object is shared between all inherited children,
+		unless they initiate their own using the 'decouple_lock_from_parent_class' method.
+	"""
+
+	SINGLETON_INSTANCE = None
+	SINGLETON_LOCK = threading.Lock()
+
+	@classmethod
+	def decouple_lock_from_parent_class( cls ):
+		if cls.SINGLETON_LOCK is not super().SINGLETON_LOCK: return
+		cls.SINGLETON_LOCK = threading.Lock()
+
+	def __new__( cls, *args, **kwargs ):
+		if cls.SINGLETON_INSTANCE: return cls.SINGLETON_INSTANCE
+
+		with cls.SINGLETON_LOCK:
+			if cls.SINGLETON_INSTANCE: return cls.SINGLETON_INSTANCE
+			cls.SINGLETON_INSTANCE = super().__new__( cls, *args, **kwargs )
+
+		return cls.SINGLETON_INSTANCE