bpo-38858: Small integer per interpreter (GH-17315)

Each Python subinterpreter now has its own "small integer
singletons": numbers in [-5; 257] range.

It is no longer possible to change the number of small integers at
build time by overriding NSMALLNEGINTS and NSMALLPOSINTS macros:
macros should now be modified manually in pycore_pystate.h header
file.

For now, continue to share _PyLong_Zero and _PyLong_One singletons
between all subinterpreters.

1 files changed, 9 insertions, 4 deletions

diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 823d96e..4f05dfc 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -576,10 +576,11 @@ pycore_init_types(PyThreadState *tstate)
         if (_PyStatus_EXCEPTION(status)) {
             return status;
         }
+    }
 
-        if (!_PyLong_Init()) {
-            return _PyStatus_ERR("can't init longs");
-        }
+
+    if (!_PyLong_Init(tstate)) {
+        return _PyStatus_ERR("can't init longs");
     }
 
     if (is_main_interp) {
@@ -1251,7 +1252,11 @@ finalize_interp_types(PyThreadState *tstate, int is_main_interp)
         _PyList_Fini();
         _PySet_Fini();
         _PyBytes_Fini();
-        _PyLong_Fini();
+    }
+
+    _PyLong_Fini(tstate);
+
+    if (is_main_interp) {
         _PyFloat_Fini();
         _PyDict_Fini();
         _PySlice_Fini();