[PATCH 0/3] Uncontroversial improvements to C++20 wait-related implementation

[Thomas Rodgers]

On 2021-03-23 09:35, Jonathan Wakely wrote:

> On 23/03/21 09:26 -0700, Thiago Macieira via Libstdc++ wrote: On 
> Tuesday, 23 March 2021 08:39:43 PDT Thomas Rodgers wrote: I will be 
> submitting a new patch for the
> atomic.wait/barrier/latch/semaphore functionality a bit later today 
> that
> subsumes the changes to atomic_wait and latch, and includes the changes
> to barrier.
> Thanks, Thomas
> 
> Is that meant to be part of GCC 11's release?

Yes.

> If not, what do we do about preventing the future BC break and 
> potential
> heisenbugs?
> 
> 1) do nothing, accept they will happen silently

This is our current policy for experimental features and it isn't
going to change for GCC 11.

> 2) cause non-silent BC breaks
> 3) disable the code for now (unless explicitly opted-in)
> 
> -- Thiago Macieira - thiago.macieira (AT) intel.com
> Software Architect - Intel DPG Cloud Engineering

FWIW, I would like to commit to an ABI for this with GCC12 and 
everything currently residing in the __detail namespace would be moved 
into the .so as part of that (likely with a third, and ideally final, 
rewrite).