gh-99113: Share the GIL via PyInterpreterState.ceval.gil (gh-104203)

In preparation for a per-interpreter GIL, we add PyInterpreterState.ceval.gil, set it to the shared GIL for each interpreter, and use that rather than using _PyRuntime.ceval.gil directly.  Note that _PyRuntime.ceval.gil is still the actual GIL.

2 files changed, 4 insertions, 1 deletions

diff --git a/Include/internal/pycore_ceval.h b/Include/internal/pycore_ceval.h
index deda070..0bbc9ef 100644
--- a/Include/internal/pycore_ceval.h
+++ b/Include/internal/pycore_ceval.h
@@ -96,7 +96,7 @@ _PyEval_Vector(PyThreadState *tstate,
             PyObject* const* args, size_t argcount,
             PyObject *kwnames);
 
-extern int _PyEval_ThreadsInitialized(struct pyruntimestate *runtime);
+extern int _PyEval_ThreadsInitialized(void);
 extern PyStatus _PyEval_InitGIL(PyThreadState *tstate);
 extern void _PyEval_FiniGIL(PyInterpreterState *interp);
 
diff --git a/Include/internal/pycore_ceval_state.h b/Include/internal/pycore_ceval_state.h
index 9ba42eb..1a00ec8 100644
--- a/Include/internal/pycore_ceval_state.h
+++ b/Include/internal/pycore_ceval_state.h
@@ -49,6 +49,8 @@ struct _ceval_runtime_state {
        the main thread of the main interpreter can handle signals: see
        _Py_ThreadCanHandleSignals(). */
     _Py_atomic_int signals_pending;
+
+    /* This is (only) used indirectly through PyInterpreterState.ceval.gil. */
     struct _gil_runtime_state gil;
 };
 
@@ -83,6 +85,7 @@ struct _pending_calls {
 
 struct _ceval_state {
     int recursion_limit;
+    struct _gil_runtime_state *gil;
     /* This single variable consolidates all requests to break out of
        the fast path in the eval loop. */
     _Py_atomic_int eval_breaker;