Call initialize and finalize from Python

clr_loader/ffi/netfx.py

@@ -5,8 +5,10 @@ cdef = [
 typedef void* pyclr_domain;
 typedef int (*entry_point)(void* buffer, int size);
 
+void pyclr_initialize();
 void* pyclr_create_appdomain(const char* name, const char* config_file);
 entry_point pyclr_get_function(pyclr_domain domain, const char* assembly_path, const char* class_name, const char* function);
 void pyclr_close_appdomain(pyclr_domain domain);
+void pyclr_finalize();
     """
 ]

clr_loader/netfx.py

@@ -1,15 +1,12 @@
+import atexit
 from .ffi import ffi, load_netfx
 
-
 _FW = None
 
 
 class NetFx:
     def __init__(self, name=None, config_file=None):
-        global _FW
-        if _FW is None:
-            _FW = load_netfx()
-
+        initialize()
         self._domain = _FW.pyclr_create_appdomain(
             name or ffi.NULL, config_file or ffi.NULL
         )
@@ -27,3 +24,21 @@ class NetFx:
     def __del__(self):
         if self._domain and _FW:
             _FW.pyclr_close_appdomain(self._domain)
+
+
+def initialize():
+    global _FW
+    if _FW is not None:
+        return
+
+    _FW = load_netfx()
+    _FW.pyclr_initialize()
+
+    atexit.register(_release)
+
+
+def _release():
+    global _FW
+    if _FW is not None:
+        _FW.pyclr_finalize()
+        _FW = None