pythonGH-111435: Add Support for Sharing True and False Between Interpreters (pythongh-111436)

This only affects users of the APIs in pycore_crossinterp.h (AKA _xxsubinterpretersmodule.c and _xxinterpchannels.c).

Author: tonybaloney

Lib/test/test__xxsubinterpreters.py

@@ -102,6 +102,8 @@ def test_default_shareables(self):
                 'spam',
                 10,
                 -10,
+                True,
+                False,
                 100.0,
                 ]
         for obj in shareables:
@@ -121,8 +123,6 @@ class SubBytes(bytes):
 
         not_shareables = [
                 # singletons
-                True,
-                False,
                 NotImplemented,
                 ...,
                 # builtin types and objects
@@ -189,6 +189,9 @@ def test_non_shareable_int(self):
                 with self.assertRaises(OverflowError):
                     _testinternalcapi.get_crossinterp_data(i)
 
+    def test_bool(self):
+        self._assert_values([True, False])
+
     def test_float(self):
         self._assert_values([0.0, 1.1, -1.0, 0.12345678, -0.12345678])
 

Lib/test/test_interpreters.py

@@ -778,6 +778,8 @@ def test_default_shareables(self):
                 'spam',
                 10,
                 -10,
+                True,
+                False,
                 100.0,
                 ]
         for obj in shareables:
@@ -797,8 +799,6 @@ class SubBytes(bytes):
 
         not_shareables = [
                 # singletons
-                True,
-                False,
                 NotImplemented,
                 ...,
                 # builtin types and objects

Misc/NEWS.d/next/Core and Builtins/2023-10-29-11-35-21.gh-issue-111435.ageUWQ.rst

@@ -0,0 +1 @@
+Added support for sharing of bool type with interpreters API.

Python/crossinterp.c

@@ -693,6 +693,26 @@ _none_shared(PyThreadState *tstate, PyObject *obj,
     return 0;
 }
 
+static PyObject *
+_new_bool_object(_PyCrossInterpreterData *data)
+{
+    if (data->data){
+        Py_RETURN_TRUE;
+    }
+    Py_RETURN_FALSE;
+}
+
+static int
+_bool_shared(PyThreadState *tstate, PyObject *obj,
+             _PyCrossInterpreterData *data)
+{
+    _PyCrossInterpreterData_Init(data, tstate->interp,
+            (void *) (Py_IsTrue(obj) ? (uintptr_t) 1 : (uintptr_t) 0), NULL,
+            _new_bool_object);
+    // data->obj and data->free remain NULL
+    return 0;
+}
+
 static void
 _register_builtins_for_crossinterpreter_data(struct _xidregistry *xidregistry)
 {
@@ -716,6 +736,11 @@ _register_builtins_for_crossinterpreter_data(struct _xidregistry *xidregistry)
         Py_FatalError("could not register str for cross-interpreter sharing");
     }
 
+    // bool
+    if (_xidregistry_add_type(xidregistry, &PyBool_Type, _bool_shared) != 0) {
+        Py_FatalError("could not register bool for cross-interpreter sharing");
+    }
+
     // float
     if (_xidregistry_add_type(xidregistry, &PyFloat_Type, _float_shared) != 0) {
         Py_FatalError("could not register float for cross-interpreter sharing");