From 3094dd5fb5fa3ed91f5e2887887b193edbc976d2 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Thu, 19 Nov 2020 09:24:37 +0100
Subject: bpo-1635741: Port _queue to multiphase initialization (GH-23376)

Signed-off-by: Christian Heimes <christian@python.org>

Automerge-Triggered-By: GH:tiran
---
 .../2020-11-18-20-11-13.bpo-1635741.fe3iRb.rst     |  1 +
 Modules/_queuemodule.c                             | 73 +++++++++++-----------
 2 files changed, 37 insertions(+), 37 deletions(-)
 create mode 100644 Misc/NEWS.d/next/C API/2020-11-18-20-11-13.bpo-1635741.fe3iRb.rst

diff --git a/Misc/NEWS.d/next/C API/2020-11-18-20-11-13.bpo-1635741.fe3iRb.rst b/Misc/NEWS.d/next/C API/2020-11-18-20-11-13.bpo-1635741.fe3iRb.rst
new file mode 100644
index 0000000..78df4fe
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2020-11-18-20-11-13.bpo-1635741.fe3iRb.rst	
@@ -0,0 +1 @@
+Port _queue extension module to multiphase initialization (:pep:`489`)
diff --git a/Modules/_queuemodule.c b/Modules/_queuemodule.c
index 7cf7399..a2b6ac8 100644
--- a/Modules/_queuemodule.c
+++ b/Modules/_queuemodule.c
@@ -381,11 +381,46 @@ PyDoc_STRVAR(queue_module_doc,
 "C implementation of the Python queue module.\n\
 This module is an implementation detail, please do not use it directly.");
 
+static int
+queuemodule_exec(PyObject *module)
+{
+    simplequeue_state *state = simplequeue_get_state(module);
+
+    state->EmptyError = PyErr_NewExceptionWithDoc(
+        "_queue.Empty",
+        "Exception raised by Queue.get(block=0)/get_nowait().",
+        NULL, NULL);
+    if (state->EmptyError == NULL) {
+        return -1;
+    }
+    if (PyModule_AddObjectRef(module, "Empty", state->EmptyError) < 0) {
+        return -1;
+    }
+
+    state->SimpleQueueType = (PyTypeObject *)PyType_FromModuleAndSpec(
+        module, &simplequeue_spec, NULL);
+    if (state->SimpleQueueType == NULL) {
+        return -1;
+    }
+    if (PyModule_AddType(module, state->SimpleQueueType) < 0) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static PyModuleDef_Slot queuemodule_slots[] = {
+    {Py_mod_exec, queuemodule_exec},
+    {0, NULL}
+};
+
+
 static struct PyModuleDef queuemodule = {
     .m_base = PyModuleDef_HEAD_INIT,
     .m_name = "_queue",
     .m_doc = queue_module_doc,
     .m_size = sizeof(simplequeue_state),
+    .m_slots = queuemodule_slots,
     .m_traverse = queue_traverse,
     .m_clear = queue_clear,
     .m_free = queue_free,
@@ -395,41 +430,5 @@ static struct PyModuleDef queuemodule = {
 PyMODINIT_FUNC
 PyInit__queue(void)
 {
-    PyObject *m;
-    simplequeue_state *state;
-
-    /* Create the module */
-    m = PyModule_Create(&queuemodule);
-    if (m == NULL)
-        return NULL;
-
-    state = simplequeue_get_state(m);
-    state->EmptyError = PyErr_NewExceptionWithDoc(
-        "_queue.Empty",
-        "Exception raised by Queue.get(block=0)/get_nowait().",
-        NULL, NULL);
-    if (state->EmptyError == NULL)
-        goto error;
-
-    Py_INCREF(state->EmptyError);
-    if (PyModule_AddObject(m, "Empty", state->EmptyError) < 0) {
-        Py_DECREF(state->EmptyError);
-        goto error;
-    }
-
-    state->SimpleQueueType = (PyTypeObject *)PyType_FromModuleAndSpec(m,
-                                                                 &simplequeue_spec,
-                                                                 NULL);
-    if (state->SimpleQueueType == NULL) {
-        goto error;
-    }
-    if (PyModule_AddType(m, state->SimpleQueueType) < 0) {
-        goto error;
-    }
-
-    return m;
-
-error:
-    Py_DECREF(m);
-    return NULL;
+   return PyModuleDef_Init(&queuemodule);
 }
-- 
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