Py_AddPendingCall can't signal background threads!!!

[Warren Postma]

"Fredrik Lundh" <fredrik at effbot.org> wrote:
> something like this might work:
>
> static int
> getoutofhere(void *unused)
> {
>     PyErr_SetNone(PyExc_KeyboardInterrupt);
>     return -1;
> }
>
> Py_AddPendingCall(getoutofhere, NULL);
>

Thanks, Fredrik. That would work except that the main thread is not the one
executing the user-provided code. Instead, there are background threads
doing that.

I noticed that Py_MakePendingCalls() doesn't do anything to help us here,
because you can't signal a background thread and tell it to stop.

What would we do if we were in the main thread, and wanted to kill a
background thread?

I suppose I could actually have a Keyboard-Interrupt-Signal hack happen in
Py_MakePendingCalls() to handle if a background thread was being told to
"die", but thus far i have avoided making changes to my own embedded python
1.5.2 that would make it somehow incompatible with a stock Python system.

However it appears that truly signalling a thread is not allowed in Python.

Warren