gh-100344: Add C implementation for `asyncio.current_task` (#100345)

Co-authored-by: pranavtbhat

2 files changed, 100 insertions, 1 deletions

diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index 32be537..6fe4ca4 100644
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -3314,6 +3314,44 @@ _asyncio__leave_task_impl(PyObject *module, PyObject *loop, PyObject *task)
 }
 
 
+/*[clinic input]
+_asyncio.current_task
+
+    loop: object = None
+
+Return a currently executed task.
+
+[clinic start generated code]*/
+
+static PyObject *
+_asyncio_current_task_impl(PyObject *module, PyObject *loop)
+/*[clinic end generated code: output=fe15ac331a7f981a input=58910f61a5627112]*/
+{
+    PyObject *ret;
+    asyncio_state *state = get_asyncio_state(module);
+
+    if (loop == Py_None) {
+        loop = _asyncio_get_running_loop_impl(module);
+        if (loop == NULL) {
+            return NULL;
+        }
+    } else {
+        Py_INCREF(loop);
+    }
+
+    ret = PyDict_GetItemWithError(state->current_tasks, loop);
+    Py_DECREF(loop);
+    if (ret == NULL && PyErr_Occurred()) {
+        return NULL;
+    }
+    else if (ret == NULL) {
+        Py_RETURN_NONE;
+    }
+    Py_INCREF(ret);
+    return ret;
+}
+
+
 /*********************** Module **************************/
 
 
@@ -3494,6 +3532,7 @@ fail:
 PyDoc_STRVAR(module_doc, "Accelerator module for asyncio");
 
 static PyMethodDef asyncio_methods[] = {
+    _ASYNCIO_CURRENT_TASK_METHODDEF
     _ASYNCIO_GET_EVENT_LOOP_METHODDEF
     _ASYNCIO_GET_RUNNING_LOOP_METHODDEF
     _ASYNCIO__GET_RUNNING_LOOP_METHODDEF
diff --git a/Modules/clinic/_asynciomodule.c.h b/Modules/clinic/_asynciomodule.c.h
index f2fbb35..43c5d77 100644
--- a/Modules/clinic/_asynciomodule.c.h
+++ b/Modules/clinic/_asynciomodule.c.h
@@ -1242,4 +1242,64 @@ _asyncio__leave_task(PyObject *module, PyObject *const *args, Py_ssize_t nargs,
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=83580c190031241c input=a9049054013a1b77]*/
+
+PyDoc_STRVAR(_asyncio_current_task__doc__,
+"current_task($module, /, loop=None)\n"
+"--\n"
+"\n"
+"Return a currently executed task.");
+
+#define _ASYNCIO_CURRENT_TASK_METHODDEF    \
+    {"current_task", _PyCFunction_CAST(_asyncio_current_task), METH_FASTCALL|METH_KEYWORDS, _asyncio_current_task__doc__},
+
+static PyObject *
+_asyncio_current_task_impl(PyObject *module, PyObject *loop);
+
+static PyObject *
+_asyncio_current_task(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 1
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(loop), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"loop", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "current_task",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[1];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 0;
+    PyObject *loop = Py_None;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 0, 1, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    loop = args[0];
+skip_optional_pos:
+    return_value = _asyncio_current_task_impl(module, loop);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=00f494214f2fd008 input=a9049054013a1b77]*/