[Bug 50292] Process-local synchronization objects use private interfaces into the Unix library

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50292

--- Comment #2 from Rémi Bernon <rbernon at codeweavers.com> ---
> In 0006-ntdll-Implement-thread-id-alerts-on-top-of-futexes-i.patch
>
> +        while (!InterlockedExchange( futex, 0 ))
> +        {
> +            if (timeout)
> +            {
> +                LONGLONG timeleft = update_timeout( end );
> +                struct timespec timespec;
> +
> +                timespec.tv_sec = timeleft / (ULONGLONG)TICKSPERSEC;
> +                timespec.tv_nsec = (timeleft % TICKSPERSEC) * 100;
> +                ret = futex_wait( futex, 0, &timespec );
> +            }
> +            else
> +                ret = futex_wait( futex, 0, NULL );
> +
> +            if (ret == -1 && errno == ETIMEDOUT) return STATUS_TIMEOUT;
> +        }

If FUTEX_WAIT_BITSET is available, I think you can use it to wait with
an absolute timeout, which could save calls to NtQuerySystemTime.

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