python · rhettinger · rhettinger · rhettinger · Aug 4, 2021 · rhettinger
diff --git a/Lib/functools.py b/Lib/functools.py
@@ -18,7 +18,7 @@
 from collections import namedtuple
 # import types, weakref  # Deferred to single_dispatch()
 from reprlib import recursive_repr
-from _thread import RLock
+from threading import RLock, Condition, get_ident
diff --git a/Misc/NEWS.d/next/Library/2021-08-04-18-30-25.bpo-43468.PlU--J.rst b/Misc/NEWS.d/next/Library/2021-08-04-18-30-25.bpo-43468.PlU--J.rst
@@ -0,0 +1,3 @@
+Fixed locking for functools.cached_property() to have instance specific
+locking.  Formerly, it blocked all instances of the same class, making it
+suitable for parallel I/O bound computations (which were a key use case).