Issue #13992: The trashcan mechanism is now thread-safe. This eliminates
sporadic crashes in multi-thread programs when several long deallocator
chains ran concurrently and involved subclasses of built-in container
types.
Because of this change, a couple extension modules compiled for 3.2.4
(those which use the trashcan mechanism, despite it being undocumented)
will not be loadable by 3.2.3 and earlier. However, extension modules
compiled for 3.2.3 and earlier will be loadable by 3.2.4.
diff --git a/Include/pystate.h b/Include/pystate.h
index 25c2faa..2017b02 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -114,6 +114,9 @@
PyObject *async_exc; /* Asynchronous exception to raise */
long thread_id; /* Thread id where this tstate was created */
+ int trash_delete_nesting;
+ PyObject *trash_delete_later;
+
/* XXX signal handlers should also be here */
} PyThreadState;