diff --git a/Include/pystate.h b/Include/pystate.h
index f4c9d6e..c1182a6 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -72,6 +72,7 @@
     PyObject *dict;
 
     int tick_counter;
+    int gilstate_counter;
 
     /* XXX signal handlers should also be here */
 
@@ -104,6 +105,51 @@
 #define PyThreadState_GET() (_PyThreadState_Current)
 #endif
 
+typedef 
+    enum {PyGILState_LOCKED, PyGILState_UNLOCKED}
+        PyGILState_STATE;
+
+/* Ensure that the current thread is ready to call the Python
+   C API, regardless of the current state of Python, or of its
+   thread lock.  This may be called as many times as desired
+   by a thread so long as each call is matched with a call to 
+   PyGILState_Release().  In general, other thread-state APIs may 
+   be used between _Ensure() and _Release() calls, so long as the 
+   thread-state is restored to its previous state before the Release().
+   For example, normal use of the Py_BEGIN_ALLOW_THREADS/
+   Py_END_ALLOW_THREADS macros are acceptable.
+
+   The return value is an opaque "handle" to the thread state when
+   PyGILState_Acquire() was called, and must be passed to
+   PyGILState_Release() to ensure Python is left in the same state. Even
+   though recursive calls are allowed, these handles can *not* be shared - 
+   each unique call to PyGILState_Ensure must save the handle for its 
+   call to PyGILState_Release.
+
+   When the function returns, the current thread will hold the GIL.
+
+   Failure is a fatal error.
+*/
+PyAPI_FUNC(PyGILState_STATE) PyGILState_Ensure(void);
+
+/* Release any resources previously acquired.  After this call, Python's
+   state will be the same as it was prior to the corresponding
+   PyGILState_Acquire call (but generally this state will be unknown to 
+   the caller, hence the use of the GILState API.)
+
+   Every call to PyGILState_Ensure must be matched by a call to 
+   PyGILState_Release on the same thread.
+*/
+PyAPI_FUNC(void) PyGILState_Release(PyGILState_STATE);
+
+/* Helper/diagnostic function - get the current thread state for
+   this thread.  May return NULL if no GILState API has been used 
+   on the current thread.  Note the main thread always has such a 
+   thread-state, even if no auto-thread-state call has been made 
+   on the main thread.
+*/
+PyAPI_FUNC(PyThreadState *) PyGILState_GetThisThreadState(void);
+
 /* Routines for advanced debuggers, requested by David Beazley.
    Don't use unless you know what you are doing! */
 PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Head(void);