1 files changed, 47 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/greenlet/tests/fail_clearing_run_switches.py b/.venv/lib/python3.12/site-packages/greenlet/tests/fail_clearing_run_switches.py
new file mode 100644
index 00000000..6dd1492f
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/greenlet/tests/fail_clearing_run_switches.py
@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+"""
+If we have a run callable passed to the constructor or set as an
+attribute, but we don't actually use that (because ``__getattribute__``
+or the like interferes), then when we clear callable before beginning
+to run, there's an opportunity for Python code to run.
+
+"""
+import greenlet
+
+g = None
+main = greenlet.getcurrent()
+
+results = []
+
+class RunCallable:
+
+    def __del__(self):
+        results.append(('RunCallable', '__del__'))
+        main.switch('from RunCallable')
+
+
+class G(greenlet.greenlet):
+
+    def __getattribute__(self, name):
+        if name == 'run':
+            results.append(('G.__getattribute__', 'run'))
+            return run_func
+        return object.__getattribute__(self, name)
+
+
+def run_func():
+    results.append(('run_func', 'enter'))
+
+
+g = G(RunCallable())
+# Try to start G. It will get to the point where it deletes
+# its run callable C++ variable in inner_bootstrap. That triggers
+# the __del__ method, which switches back to main before g
+# actually even starts running.
+x = g.switch()
+results.append(('main: g.switch()', x))
+# In the C++ code, this results in g->g_switch() appearing to return, even though
+# it has yet to run.
+print('In main with', x, flush=True)
+g.switch()
+print('RESULTS', results)