[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  ---
> 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.