Issue python#104: global C variable slp_initial_tstate used before initialisation

Initialise slp_initial_tstate early, as in Stackless 2.7.

https://bitbucket.org/stackless-dev/stackless/issues/104

Author: Anselm Kruis

Stackless/changelog.txt

@@ -9,6 +9,9 @@ What's New in Stackless 3.X.X?
 
 *Release date: 20XX-XX-XX*
 
+- https://bitbucket.org/stackless-dev/stackless/issues/104
+  Initialise the global variable slp_initial_tstate early before it is used.
+
 - https://bitbucket.org/stackless-dev/stackless/issues/103
   Fix an invalid assertion during interpreter shutdown.
 

Stackless/module/stacklessmodule.c

@@ -1674,6 +1674,9 @@ static int init_stackless_methods(void)
 int
 _PyStackless_InitTypes(void)
 {
+    /* record the thread state for thread support */
+    slp_initial_tstate = PyThreadState_GET();
+
     if (0
         || init_stackless_methods()
         || PyType_Ready(&PyTasklet_Type) /* need this early for the main tasklet */
@@ -1710,9 +1713,6 @@ PyInit__stackless(void)
         )
         return NULL;
 
-    /* record the thread state for thread support */
-    slp_initial_tstate = PyThreadState_GET();
-
     /* Create the module and add the functions */
     slp_module = PyModule_Create(&stacklessmodule);
     if (slp_module == NULL)