Re: remove unnecessary volatile qualifiers

On 01/07/2026 00:47, Nathan Bossart wrote:
> I looked into some of these earlier [0], but ended up leaving them alone at
> the time. Here is a new patch that removes all of the volatile markers in
> the tree that seemed obviously unnecessary to me.

Thanks!

> --- a/src/backend/access/transam/clog.c
> +++ b/src/backend/access/transam/clog.c
> @@ -450,7 +450,7 @@ static bool
> TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
> XLogRecPtr lsn, int64 pageno)
> {
> - volatile PROC_HDR *procglobal = ProcGlobal;
> + PROC_HDR *procglobal = ProcGlobal;
> PGPROC *proc = MyProc;
> uint32 nextidx;
> uint32 wakeidx;

You might want to get rid of the local variable altogether and just
refer to ProcGlobal directly..

> @@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
> {
> uint64 local_gen;
> uint64 shared_gen;
> - volatile uint32 flags;
> + uint32 flags;
>
> Assert(MyProcSignalSlot);
>

Are you sure about this one? 'flags' is used in the PG_TRY/CATCH block
that follows. It is modified in the PG_TRY(), here:

>
> /*
> * To avoid an infinite loop, we must always unset the bit in
> * flags.
> */
> BARRIER_CLEAR_BIT(flags, type);

and read later in the PG_CATCH() block.

The rest looks OK to me.

- Heikki