Add change note.issue252

2 files changed, 7 insertions, 0 deletions

diff --git a/CHANGES.rst b/CHANGES.rst
index fdccb1d..ced3b2f 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -12,6 +12,11 @@
   older GCC, clang and SunStudio we use ``__thread``, while for older
   MSVC we use ``__declspec(thread)``.
 
+- Fix several leaks that could occur when using greenlets from
+  multiple threads. For example, it is no longer necessary to call
+  ``getcurrent()`` before exiting a thread to allow its main greenlet
+  to be cleaned up. See `issue 252 <https://github.com/python-greenlet/greenlet/issues/251>`_.
+
 1.1.2 (2021-09-29)
 ==================
 
diff --git a/src/greenlet/greenlet_thread_state.hpp b/src/greenlet/greenlet_thread_state.hpp
index 98a771a..b353f13 100644
--- a/src/greenlet/greenlet_thread_state.hpp
+++ b/src/greenlet/greenlet_thread_state.hpp
@@ -412,6 +412,8 @@ public:
                 // Highly likely that the reference is somewhere on
                 // the stack, not reachable by GC. Verify.
                 // XXX: This is O(n) in the total number of objects.
+                // TODO: Add a way to disable this at runtime, and
+                // another way to report on it.
                 PyObject* gc = PyImport_ImportModule("gc");
                 PyObject* get_referrers = NULL;
                 PyObject* refs = NULL;