gh-106140: Reorder some fields to facilitate out-of-process inspection (#106143)

Signed-off-by: Pablo Galindo <pablogsal@gmail.com>

1 files changed, 14 insertions, 8 deletions

diff --git a/Include/internal/pycore_runtime.h b/Include/internal/pycore_runtime.h
index 8f51e2d..5ed97e9 100644
--- a/Include/internal/pycore_runtime.h
+++ b/Include/internal/pycore_runtime.h
@@ -84,13 +84,6 @@ typedef struct pyruntimestate {
        to access it, don't access it directly. */
     _Py_atomic_address _finalizing;
 
-    struct _pymem_allocators allocators;
-    struct _obmalloc_global_state obmalloc;
-    struct pyhash_runtime_state pyhash_state;
-    struct _time_runtime_state time;
-    struct _pythread_runtime_state threads;
-    struct _signals_runtime_state signals;
-
     struct pyinterpreters {
         PyThread_type_lock mutex;
         /* The linked list of interpreters, newest first. */
@@ -109,13 +102,26 @@ typedef struct pyruntimestate {
            using a Python int. */
         int64_t next_id;
     } interpreters;
+
+    unsigned long main_thread;
+
+    /* ---------- IMPORTANT ---------------------------
+     The fields above this line are declared as early as
+     possible to facilitate out-of-process observability
+     tools. */
+
     // XXX Remove this field once we have a tp_* slot.
     struct _xidregistry {
         PyThread_type_lock mutex;
         struct _xidregitem *head;
     } xidregistry;
 
-    unsigned long main_thread;
+    struct _pymem_allocators allocators;
+    struct _obmalloc_global_state obmalloc;
+    struct pyhash_runtime_state pyhash_state;
+    struct _time_runtime_state time;
+    struct _pythread_runtime_state threads;
+    struct _signals_runtime_state signals;
 
     /* Used for the thread state bound to the current thread. */
     Py_tss_t autoTSSkey;