Re: [RFC] "single step" atomic instruction sequences as a whole on PPC

[Luis Machado <luisgpm@linux.vnet.ibm.com>]

> Hi Luis,
> 
> please check the attached two testcases and run them at least 100x etc.
> 
> Unfortunately the threaded one fails for me in some 7% of cases IMO due to
> a race at the `infrun.c' line:
> 	remove_status = remove_breakpoints ();
> 
> The whole idea of running all the threads of the program to step over the
> atomic sequence is problematic as the other threads may hit the inserted
> breakpoint.  While this cases is handled it contains a race.
> 
> One way would be to use some temporary:
> 	if (scheduler_mode == schedlock_off)
> 	  scheduler_mode = schedlock_step;
> 
> But I believe one could use the PPC simulation code instead of the whole
> breakpoint/resume way?
> 
> 
> Regards,
> Jan

You had a fix for reducing the failures from 99% to 93%, right? Is this
available on HEAD?

Regards,
Luis