From d607ae00f3c89570fa74e4dac70131ee8b5c4606 Mon Sep 17 00:00:00 2001
From: "Gustavo J. A. M. Carneiro" <gjc@inescporto.pt>
Date: Sat, 27 Sep 2008 15:32:04 +0100
Subject: [PATCH] Need to acquire the Python GIL also in ~PythonEventImpl, as
 it may be called at any time from the C++ code, from any thread.

---
 bindings/python/ns3module_helpers.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/bindings/python/ns3module_helpers.cc b/bindings/python/ns3module_helpers.cc
index 51e7e0d9b..cb2fab4a9 100644
--- a/bindings/python/ns3module_helpers.cc
+++ b/bindings/python/ns3module_helpers.cc
@@ -28,8 +28,14 @@ public:
     }
     virtual ~PythonEventImpl ()
     {
+        PyGILState_STATE __py_gil_state;
+        __py_gil_state = (PyEval_ThreadsInitialized() ? PyGILState_Ensure() : (PyGILState_STATE) 0);
+
         Py_DECREF(m_callback);
         Py_DECREF(m_args);
+
+        if (PyEval_ThreadsInitialized())
+            PyGILState_Release(__py_gil_state);
     }
     virtual void Notify ()
     {