Add PyInterpreterState.runtime field.

Author: ericsnowcurrently

Include/internal/pycore_pystate.h

@@ -19,6 +19,9 @@ extern "C" {
 #include "pycore_pymem.h"
 #include "pycore_warnings.h"
 
+// forward
+struct pyruntimestate;
+
 
 /* ceval state */
 
@@ -68,6 +71,7 @@ struct _is {
 
     struct _is *next;
     struct _ts *tstate_head;
+    struct pyruntimestate *runtime;
 
     int64_t id;
     int64_t id_refcount;

Python/pystate.c

@@ -202,6 +202,9 @@ PyInterpreterState_New(void)
     }
 
     memset(interp, 0, sizeof(*interp));
+
+    interp->runtime = &_PyRuntime;
+
     interp->id_refcount = -1;
     interp->check_interval = 100;