1 files changed, 4 insertions, 0 deletions
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index 0cb2720..387dc8c 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -573,6 +573,10 @@ signal_pthread_sigmask(PyObject *self, PyObject *args)
         return NULL;
     }
 
+    /* if signals was unblocked, signal handlers have been called */
+    if (PyErr_CheckSignals())
+        return NULL;
+
     result = PyList_New(0);
     if (result == NULL)
         return NULL;