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coroutines: Error when awaiting on coroutine that's being awaited

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Issue #25888
This commit is contained in:
Yury Selivanov 2016-03-02 11:30:46 -05:00
parent e076ffb068
commit c724bae51c
4 changed files with 40 additions and 6 deletions
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15
Python/ceval.c
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@ -2021,6 +2021,21 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
Py_DECREF(iterable);
if (iter != NULL && PyCoro_CheckExact(iter)) {
PyObject *yf = _PyGen_yf((PyGenObject*)iter);
if (yf != NULL) {
/* `iter` is a coroutine object that is being
awaited, `yf` is a pointer to the current awaitable
being awaited on. */
Py_DECREF(yf);
Py_CLEAR(iter);
PyErr_SetString(
PyExc_RuntimeError,
"coroutine is being awaited already");
/* The code below jumps to `error` if `iter` is NULL. */
}
}
SET_TOP(iter); /* Even if it's NULL */
if (iter == NULL) {