🚀 go-pugleaf

Hi,

Here is my problem: 

I would like to stop a thread, 
be able to change the values in local variables on the stack 
of that thread, and resume the thread.

How can I be sure there is no problem with register optimization ?

Is stopping the thread in a dedicated function sufficient for 
changing the variables of superior stack frames in a safe manner ?

Is making the dedicated function "volatile" necessary ?

Can this function be an asm() ?

Is there registers whose values do not appear on the stack ?
I think about the "this" pointer in g++ or local variable 
declared as register ?

Can I forbid such situation where some registers do not have
a corresponding local variable ?

Thanks in advance.

Olivier.