Address reviewer comments.

Author: Yhg1s

src/greenlet/PyModule.cpp

@@ -168,8 +168,8 @@ mod_enable_optional_cleanup(PyObject* UNUSED(module), PyObject* flag)
         return nullptr;
     }
 
-    std::clock_t clocks = ThreadState::clocks_used_doing_gc();
     if (is_true) {
+        std::clock_t clocks = ThreadState::clocks_used_doing_gc();
         // If we already have a value, we don't want to lose it.
         if (clocks == std::clock_t(-1)) {
             ThreadState::set_clocks_used_doing_gc(0);

tox.ini

@@ -1,11 +1,11 @@
 [tox]
 envlist =
-    py{37,38,39,310,311,312,313,314},py{310,311,312,313,314}-ns,docs
+    py{37,38,39,310,311,312,313,314},py{310,311,312,313,314}-ns,docs,py314t,tsan-314#,tsan-314t
 
 [testenv]
 commands =
     python -c 'import greenlet._greenlet as G; assert G.GREENLET_USE_STANDARD_THREADING'
-    python -m unittest discover -v greenlet.tests
+    python -m unittest discover greenlet.tests
     sphinx-build -b doctest -d docs/_build/doctrees-{envname} docs docs/_build/doctest-{envname}
 sitepackages = False
 extras =
@@ -21,3 +21,13 @@ commands =
     sphinx-build -b html -d docs/_build/doctrees docs docs/_build/html
     sphinx-build -b doctest -d docs/_build/doctrees docs docs/_build/doctest
 extras = docs
+
+[testenv:tsan-314t]
+basepython = /usr/local/python-builds/tsan/bin/python3.14t
+passenv =
+    TSAN_OPTIONS
+
+[testenv:tsan-314]
+basepython = /usr/local/python-builds/default-tsan/bin/python3.14
+passenv =
+    TSAN_OPTIONS