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gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292)

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Add a FRAME_SUSPENDED_YIELD_FROM_LOCKED state that acts as a brief
lock, preventing other threads from transitioning the frame state
while gen_getyieldfrom reads the yield-from object off the stack.
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Sam Gross 2026-01-30 12:20:27 -05:00 • committed by GitHub
parent a7048327ed
commit a01694dacd
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9 changed files with 103 additions and 19 deletions
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4
Python/ceval.c
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@ -3391,7 +3391,9 @@ _PyEval_GetAwaitable(PyObject *iterable, int oparg)
else if (PyCoro_CheckExact(iter)) {
PyCoroObject *coro = (PyCoroObject *)iter;
int8_t frame_state = FT_ATOMIC_LOAD_INT8_RELAXED(coro->cr_frame_state);
if (frame_state == FRAME_SUSPENDED_YIELD_FROM) {
if (frame_state == FRAME_SUSPENDED_YIELD_FROM ||
frame_state == FRAME_SUSPENDED_YIELD_FROM_LOCKED)
{
/* `iter` is a coroutine object that is being awaited. */
Py_CLEAR(iter);
_PyErr_SetString(PyThreadState_GET(), PyExc_RuntimeError,