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[3.13] gh-121621: Disable asyncio freelist in free-threaded build (GH-122046)#122048

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Merged
colesbury merged 1 commit into from
Jul 19, 2024
Merged

[3.13] gh-121621: Disable asyncio freelist in free-threaded build (GH-122046) #122048

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22 changes: 17 additions & 5 deletions Modules/_asynciomodule.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -71,8 +71,10 @@ typedef struct {
/* Counter for autogenerated Task names */
uint64_t task_name_counter;

#ifndef Py_GIL_DISABLED
futureiterobject *fi_freelist;
Py_ssize_t fi_freelist_len;
#endif
} asyncio_state;

static inline asyncio_state *
Expand DownExpand Up@@ -1520,14 +1522,14 @@ FutureIter_dealloc(futureiterobject *it)

assert(_PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE));

PyObject *module = ((PyHeapTypeObject*)tp)->ht_module;
asyncio_state *state = NULL;

PyObject_GC_UnTrack(it);
tp->tp_clear((PyObject *)it);

#ifndef Py_GIL_DISABLED
// GH-115874: We can't use PyType_GetModuleByDef here as the type might have
// already been cleared, which is also why we must check if ht_module != NULL.
PyObject *module = ((PyHeapTypeObject*)tp)->ht_module;
asyncio_state *state = NULL;
if (module && _PyModule_GetDef(module) == &_asynciomodule) {
state = get_asyncio_state(module);
}
Expand All@@ -1538,7 +1540,9 @@ FutureIter_dealloc(futureiterobject *it)
it->future = (FutureObj*) state->fi_freelist;
state->fi_freelist = it;
}
else {
else
#endif
{
PyObject_GC_Del(it);
Py_DECREF(tp);
}
Expand DownExpand Up@@ -1742,14 +1746,17 @@ future_new_iter(PyObject *fut)
asyncio_state *state = get_asyncio_state_by_def((PyObject *)fut);
ENSURE_FUTURE_ALIVE(state, fut)

#ifndef Py_GIL_DISABLED
if (state->fi_freelist_len) {
state->fi_freelist_len--;
it = state->fi_freelist;
state->fi_freelist = (futureiterobject*) it->future;
it->future = NULL;
_Py_NewReference((PyObject*) it);
}
else {
else
#endif
{
it = PyObject_GC_New(futureiterobject, state->FutureIterType);
if (it == NULL) {
return NULL;
Expand DownExpand Up@@ -3463,6 +3470,7 @@ _asyncio_current_task_impl(PyObject *module, PyObject *loop)
static void
module_free_freelists(asyncio_state *state)
{
#ifndef Py_GIL_DISABLED
PyObject *next;
PyObject *current;

Expand All@@ -3477,6 +3485,7 @@ module_free_freelists(asyncio_state *state)
}
assert(state->fi_freelist_len == 0);
state->fi_freelist = NULL;
#endif
}

static int
Expand DownExpand Up@@ -3507,13 +3516,16 @@ module_traverse(PyObject *mod, visitproc visit, void *arg)

Py_VISIT(state->context_kwname);

#ifndef Py_GIL_DISABLED
// Visit freelist.
PyObject *next = (PyObject*) state->fi_freelist;
while (next != NULL) {
PyObject *current = next;
Py_VISIT(current);
next = (PyObject*) ((futureiterobject*) current)->future;
}
#endif

return 0;
}

Expand Down