gh-99113: Add PyInterpreterConfig.own_gil (gh-104204)

We also add PyInterpreterState.ceval.own_gil to record if the interpreter actually has its own GIL.

Note that for now we don't actually respect own_gil; all interpreters still share the one GIL.  However, PyInterpreterState.ceval.own_gil does reflect PyInterpreterConfig.own_gil.  That lie is a temporary one that we will fix when the GIL really becomes per-interpreter.

3 files changed, 5 insertions, 1 deletions

diff --git a/Include/cpython/initconfig.h b/Include/cpython/initconfig.h
index 9c1783d272..efae2409b5 100644
--- a/Include/cpython/initconfig.h
+++ b/Include/cpython/initconfig.h
@@ -252,6 +252,7 @@ typedef struct {
     int allow_threads;
     int allow_daemon_threads;
     int check_multi_interp_extensions;
+    int own_gil;
 } PyInterpreterConfig;
 
 #define _PyInterpreterConfig_INIT \
@@ -262,6 +263,7 @@ typedef struct {
         .allow_threads = 1, \
         .allow_daemon_threads = 0, \
         .check_multi_interp_extensions = 1, \
+        .own_gil = 1, \
     }
 
 #define _PyInterpreterConfig_LEGACY_INIT \
@@ -272,6 +274,7 @@ typedef struct {
         .allow_threads = 1, \
         .allow_daemon_threads = 1, \
         .check_multi_interp_extensions = 0, \
+        .own_gil = 0, \
     }
 
 /* --- Helper functions --------------------------------------- */
diff --git a/Include/internal/pycore_ceval.h b/Include/internal/pycore_ceval.h
index 0bbc9efdda..b7a9bf4042 100644
--- a/Include/internal/pycore_ceval.h
+++ b/Include/internal/pycore_ceval.h
@@ -97,7 +97,7 @@ _PyEval_Vector(PyThreadState *tstate,
             PyObject *kwnames);
 
 extern int _PyEval_ThreadsInitialized(void);
-extern PyStatus _PyEval_InitGIL(PyThreadState *tstate);
+extern PyStatus _PyEval_InitGIL(PyThreadState *tstate, int own_gil);
 extern void _PyEval_FiniGIL(PyInterpreterState *interp);
 
 extern void _PyEval_ReleaseLock(PyThreadState *tstate);
diff --git a/Include/internal/pycore_ceval_state.h b/Include/internal/pycore_ceval_state.h
index 1a00ec8027..4781dd5735 100644
--- a/Include/internal/pycore_ceval_state.h
+++ b/Include/internal/pycore_ceval_state.h
@@ -86,6 +86,7 @@ struct _pending_calls {
 struct _ceval_state {
     int recursion_limit;
     struct _gil_runtime_state *gil;
+    int own_gil;
     /* This single variable consolidates all requests to break out of
        the fast path in the eval loop. */
     _Py_atomic_int eval_breaker;