[tomer filiba]
> while working on a library for raising exceptions in the context
> of another thread, i've come across a bug in PyThreadState_SetAsyncExc.
> if i raise an instance, sys.exc_info() confuses the exception value for
> the exception type, and the exception value is set None. if i raise the
> type itself, the interpreter creates an instance internally, but then i can't
> pass arguments to the exception.
That appears to be the way it was designed; i.e., AFAICT, it's working
as intended. This follows from the code in ceval.c that raises the
exception:
if (tstate->async_exc != NULL) {
x = tstate->async_exc;
tstate->async_exc = NULL;
PyErr_SetNone(x);
Py_DECREF(x);
why = WHY_EXCEPTION;
goto on_error;
}
PyErr_SetNone(x) there gives no possibility that setting an /instance/
could work as you hope -- `x` has to be an exception type, and
tstate->async_exc is simply the `exc` argument that was passed to
PyThreadState_SetAsyncExc().
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