Stackless issue python#221: Change C-stack serial numbers to 64bit

These numbers were already 64bit if available until the relevant
preprocessor macro was renamed. This change affects Stackless structures
PyStacklessState and PyCStackObject. Extension authors usually don't
access them directly.
(cherry picked from commit ce8faba)

Author: Anselm Kruis

Include/slp_structs.h

@@ -143,11 +143,7 @@ typedef struct _cstack {
     PyObject_VAR_HEAD
     struct _cstack *next;
     struct _cstack *prev;
-#ifdef have_long_long
-    long_long serial;
-#else
-    long serial;
-#endif
+    PY_LONG_LONG serial;
     struct _tasklet *task;
     int nesting_level;
     PyThreadState *tstate;

Include/slp_tstate.h

@@ -76,13 +76,8 @@ typedef struct _sts {
      * stack belongs.  This is used to find out if a stack switch
      * is required when the main tasklet exits
      */
-#ifdef have_long_long
-    long_long serial;
-    long_long serial_last_jump;
-#else
-    long serial;
-    long serial_last_jump;
-#endif
+    PY_LONG_LONG serial;
+    PY_LONG_LONG serial_last_jump;
     /* the blueprint for new stacks */
     struct _cstack *initial_stub;
     /* the base address for hijacking stacks. XXX deprecating */

Stackless/changelog.txt

@@ -9,6 +9,12 @@ What's New in Stackless 3.X.X?
 
 *Release date: 20XX-XX-XX*
 
+- https://github.com/stackless-dev/stackless/issues/221
+  Change the width of C-stack serial numbers to 64bit. This prevents overflows
+  in long running applications with an embedded Stackless Python.
+  This change affects internal Stackless C structures PyStacklessState and
+  PyCStackObject. If you tamper with them, you must recompile your code!
+
 - https://github.com/stackless-dev/stackless/issues/219
   Fix a NULL pointer access in PyStackless_Schedule, if this function is called
   from from "outside" and if no current tasklet exists.

Stackless/module/stacklessmodule.c

@@ -936,7 +936,7 @@ test_outside(PyObject *self)
     int recursion_depth = ts->recursion_depth;
     int nesting_level = ts->st.nesting_level;
     PyObject *ret = Py_None;
-    int jump = ts->st.serial_last_jump;
+    PY_LONG_LONG jump = ts->st.serial_last_jump;
 
     Py_INCREF(ret);
     ts->st.main = NULL;