$thread convenience variable

[Andrew STUBBS]

Vladimir Prus wrote:
> Is that technically feasible? The $thread variable must be set before the call 
> to bpstat_stop_status, otherwise you can't use $thread in breakpoint 
> condition. Well, you can, but when evaluating breakpoint condition you'll use 
> the old value of $thread, not the number of the thread where we've stopped.
> 
> Unless cli-script.c is somehow invoked from handle_inferior_event.

You're quite right, cli-script.c probably isn't the place to put this 
stuff. It would convert it at the wrong time and wouldn't work. Somehow 
I got confused with attaching command scripts to the breakpoint, not 
conditions. In that case it would work.

What I really meant to say was _like_ the ones in cli-script.c. The code 
might live somewhere else.

My point was that a (read-only) substitution might be better than a 
generic convenience variable for this purpose.

Anyway, it was just a suggestion, and, thinking about it again, it 
probably would be quite difficult to get it substituted in all the right 
places at all the right times without limiting its scope somehow.

Andrew