From ec3051815c01ca8d98f97cc79747e305fe74abff Mon Sep 17 00:00:00 2001
From: Matthias Hochsteger <matthias.hochsteger@tuwien.ac.at>
Date: Fri, 29 Jun 2018 16:22:21 +0200
Subject: [PATCH] [python] Patch pybind11 function to avoid deadlocks

see https://github.com/pybind/pybind11/pull/1211
---
 libsrc/general/ngpython.hpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libsrc/general/ngpython.hpp b/libsrc/general/ngpython.hpp
index e0980d85..c3931215 100644
--- a/libsrc/general/ngpython.hpp
+++ b/libsrc/general/ngpython.hpp
@@ -1,5 +1,17 @@
 #ifdef NG_PYTHON
 
+// BEGIN EVIL HACK: Patch PyThread_get_key_value inside pybind11 to avoid deadlocks
+// see https://github.com/pybind/pybind11/pull/1211
+#include <Python.h>
+#include <pythread.h>
+namespace pybind11 {
+    inline void * PyThread_get_key_value(int state) {
+        PyThreadState *tstate = (PyThreadState *) ::PyThread_get_key_value(state);
+        if (!tstate) tstate = PyGILState_GetThisThreadState();
+        return tstate;
+    }
+}
+// END EVIL HACK
 #include <pybind11/pybind11.h>
 #include <pybind11/operators.h>
 namespace py = pybind11;