[RFC] Using bt command in async mode

[Vladimir Prus]

Nick Roberts wrote:

>  > Nick> This patch allows the bt to be executed in async mode while the
>  > Nick> inferior is executing.
>  > 
>  > Nick> !        && strcmp (c->name, "interrupt") != 0
>  > Nick> !        && strcmp (c->name, "bt") != 0)
>  > 
>  > I've seen a couple patches recently that touch this conditional.
>  > 
>  > What do you think of this?  It moves the flag into the command object
>  > instead of hard-coding it into a big 'if'.
> 
> Sure, the list will only get longer.  In the long run it might be a good
> idea to add an argument to add_cmd and related functions.
> 
> Incidentally, the patch I've presented for bt isn't suitable for inclusion
> as it uses:
> 
> +
> +   if (restart)
> +     continue_command ("&", 0);
> 
> If the user interrupts with 'bt' during a step, he presumably wants the step to
> finish.  I'm not sure how easy it is for Gdb to jump the inferior back into
> it's old state of execution.

It's not very hard. You only need to hack continue_command not to call (indirectly)
the clear_proceed_status function, which currently wipes away all state.

- Volodya