What do IFUNC resolvers need to be useful?

[Szabolcs Nagy]

On 22/03/16 15:13, Jose E. Marchesi wrote:
> 
>     > Should IFUNC resolver get passed in a pointer to the
>     > environment?
>     
>     I think that it would be a great improvement.
>     
>     One can imagine to use that on the libc for example to temporarily
>     disable the optimized functions. That can be useful for debugging,
>     but also in our testsuite to test the various versions of a
>     function.
> 
> +1
> 
> Sometimes old code breaks with new optimized routines, such as
> multithread issues in routines using block-initialize instructions in
> sparc.  In these situations it would be very useful to disable certain
> versions of the routines.
> 
> Also, it would allow users to easily benchmark the performance of the
> routines applications/platforms and choose the best implementation for
> them.
> 

so what should happen if a signal interrupts setenv
and the signal handler calls a function through plt
that needs ifunc resolution..