Can scm_shell be interrupted?

[Remco Bras]

Hello,

I have a question about guile. I'd like to know if it is feasible to run a 
guile REPL and control when it runs. For example, consider the following 
scenario. A package may or may not have a thread running scm_shell, when the 
user requests that the package runs an REPL. The package responds by running 
scm_shell in a thread and keeping that thread's ID. If the user wants the 
package to stop the REPL at any moment, is there a way to do this safely? 

Thanks in advance,

Remco Bras