updated for version 7.3.691
Problem: State specific to the Python thread is discarded.
Solution: Keep state between threads. (Paul)
diff --git a/src/if_python.c b/src/if_python.c
index c194598..2a53c93 100644
--- a/src/if_python.c
+++ b/src/if_python.c
@@ -740,9 +740,11 @@
#else
PyMac_Initialize();
#endif
- /* initialise threads */
+ /* Initialise threads and save the state using PyGILState_Ensure.
+ * Without this call, thread-specific state (such as the system trace
+ * hook), will be lost between invocations of Python code. */
PyEval_InitThreads();
-
+ pygilstate = PyGILState_Ensure();
#ifdef DYNAMIC_PYTHON
get_exceptions();
#endif