[slime-devel] interrupting REPL-launched thread in background

[alistair gee]

I normally use C-x C-e to execute a form. Since I use either SBCL (with
threading enabled) or ACL, slime creates a new thread to execute the form
(rather than executing the form in the REPL thread). 

Occasionally, I need to interrupt or debug the execution. I know that I can use
slime-list-threads to see the list of threads. How do I determine which thread
is the one that is executing my form? How do I interrupt that thread safely (so
that the stack is unwound cleanly)?