https://github.com/python/cpython/commit/7e3b788e8f3dc986bcccb047ddc3f0a7a99bb08c
commit: 7e3b788e8f3dc986bcccb047ddc3f0a7a99bb08c
branch: main
author: Kumar Aditya <kumaradi...@python.org>
committer: kumaraditya303 <kumaradi...@python.org>
date: 2025-03-03T06:36:43Z
summary:
gh-128002: use efficient linked list implementation for eager tasks in asyncio
(#130518)
files:
M Lib/asyncio/tasks.py
M Modules/_asynciomodule.c
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 06d46deda8d647..825e91f5594d98 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -1110,7 +1110,6 @@ def _unregister_eager_task(task):
from _asyncio import (_register_task, _register_eager_task,
_unregister_task, _unregister_eager_task,
_enter_task, _leave_task, _swap_current_task,
- _scheduled_tasks, _eager_tasks,
current_task, all_tasks)
except ImportError:
pass
diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index c743c246cb4a67..99463562e67286 100644
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -143,8 +143,9 @@ typedef struct {
inherit from native asyncio.Task */
PyObject *non_asyncio_tasks;
- /* Set containing all eagerly executing tasks. */
- PyObject *eager_tasks;
+ /* Set containing all 3rd party eagerly executing tasks which don't
+ inherit from native asyncio.Task */
+ PyObject *non_asyncio_eager_tasks;
/* An isinstance type cache for the 'is_coroutine()' function. */
PyObject *iscoroutine_typecache;
@@ -2180,12 +2181,6 @@ register_task(TaskObj *task)
llist_insert_tail(head, &task->task_node);
}
-static int
-register_eager_task(asyncio_state *state, PyObject *task)
-{
- return PySet_Add(state->eager_tasks, task);
-}
-
static inline void
unregister_task_safe(TaskObj *task)
{
@@ -2219,12 +2214,6 @@ unregister_task(TaskObj *task)
#endif
}
-static int
-unregister_eager_task(asyncio_state *state, PyObject *task)
-{
- return PySet_Discard(state->eager_tasks, task);
-}
-
static int
enter_task(PyObject *loop, PyObject *task)
{
@@ -3472,11 +3461,11 @@ task_eager_start(asyncio_state *state, TaskObj *task)
if (prevtask == NULL) {
return -1;
}
-
- if (register_eager_task(state, (PyObject *)task) == -1) {
- Py_DECREF(prevtask);
- return -1;
- }
+ // register the task into the linked list of tasks
+ // if the task completes eagerly (without suspending) then it will
unregister itself
+ // in future_schedule_callbacks when done, otherwise
+ // it will continue as a regular (non-eager) asyncio task
+ register_task(task);
if (PyContext_Enter(task->task_context) == -1) {
Py_DECREF(prevtask);
@@ -3506,17 +3495,11 @@ task_eager_start(asyncio_state *state, TaskObj *task)
Py_DECREF(curtask);
}
- if (unregister_eager_task(state, (PyObject *)task) == -1) {
- retval = -1;
- }
-
if (PyContext_Exit(task->task_context) == -1) {
retval = -1;
}
- if (task->task_state == STATE_PENDING) {
- register_task(task);
- } else {
+ if (task->task_state != STATE_PENDING) {
// This seems to really help performance on pyperformance benchmarks
clear_task_coro(task);
}
@@ -3735,9 +3718,18 @@ _asyncio__register_eager_task_impl(PyObject *module,
PyObject *task)
/*[clinic end generated code: output=dfe1d45367c73f1a input=237f684683398c51]*/
{
asyncio_state *state = get_asyncio_state(module);
- if (register_eager_task(state, task) < 0) {
+
+ if (Task_Check(state, task)) {
+ // task is an asyncio.Task instance or subclass, use efficient
+ // linked-list implementation.
+ register_task((TaskObj *)task);
+ Py_RETURN_NONE;
+ }
+
+ if (PySet_Add(state->non_asyncio_eager_tasks, task) < 0) {
return NULL;
}
+
Py_RETURN_NONE;
}
@@ -3785,9 +3777,17 @@ _asyncio__unregister_eager_task_impl(PyObject *module,
PyObject *task)
/*[clinic end generated code: output=a426922bd07f23d1 input=9d07401ef14ee048]*/
{
asyncio_state *state = get_asyncio_state(module);
- if (unregister_eager_task(state, task) < 0) {
+ if (Task_Check(state, task)) {
+ // task is an asyncio.Task instance or subclass, use efficient
+ // linked-list implementation.
+ unregister_task((TaskObj *)task);
+ Py_RETURN_NONE;
+ }
+
+ if (PySet_Discard(state->non_asyncio_eager_tasks, task) < 0) {
return NULL;
}
+
Py_RETURN_NONE;
}
@@ -4041,7 +4041,7 @@ _asyncio_all_tasks_impl(PyObject *module, PyObject *loop)
Py_DECREF(loop);
return NULL;
}
- if (PyList_Extend(tasks, state->eager_tasks) < 0) {
+ if (PyList_Extend(tasks, state->non_asyncio_eager_tasks) < 0) {
Py_DECREF(tasks);
Py_DECREF(loop);
return NULL;
@@ -4179,7 +4179,7 @@ module_traverse(PyObject *mod, visitproc visit, void *arg)
Py_VISIT(state->asyncio_CancelledError);
Py_VISIT(state->non_asyncio_tasks);
- Py_VISIT(state->eager_tasks);
+ Py_VISIT(state->non_asyncio_eager_tasks);
Py_VISIT(state->iscoroutine_typecache);
Py_VISIT(state->context_kwname);
@@ -4209,7 +4209,7 @@ module_clear(PyObject *mod)
Py_CLEAR(state->asyncio_CancelledError);
Py_CLEAR(state->non_asyncio_tasks);
- Py_CLEAR(state->eager_tasks);
+ Py_CLEAR(state->non_asyncio_eager_tasks);
Py_CLEAR(state->iscoroutine_typecache);
Py_CLEAR(state->context_kwname);
@@ -4292,8 +4292,8 @@ module_init(asyncio_state *state)
goto fail;
}
- state->eager_tasks = PySet_New(NULL);
- if (state->eager_tasks == NULL) {
+ state->non_asyncio_eager_tasks = PySet_New(NULL);
+ if (state->non_asyncio_eager_tasks == NULL) {
goto fail;
}
@@ -4363,14 +4363,6 @@ module_exec(PyObject *mod)
return -1;
}
- if (PyModule_AddObjectRef(mod, "_scheduled_tasks",
state->non_asyncio_tasks) < 0) {
- return -1;
- }
-
- if (PyModule_AddObjectRef(mod, "_eager_tasks", state->eager_tasks) < 0) {
- return -1;
- }
-
return 0;
}
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