On Tue Jun 22 2021, Florian Weimer wrote:
> * Kurt Kanzenbach:
>
>> At this point __ASSUME_FUTEX_LOCK_PI2 is false meaning the kernel does
>> not have FUTEX_LOCK_PI2 support. But, it calls FUTEX_LOCK_PI2 for
>> clockid monotonic. This will result in ENOSYS unless it's an old kernel
>> which is patched. Is that intended?
>
> That's not quite how the __ASSUME_* macros work.  If not defined, it
> just means that glibc won't assume that the kernel feature is there.  It
> can still use it (the run-time kernel might have it after all), but
> glibc has to check for the feature and has to compile in some sort of
> fallback code.

OK, makes sense. Thanks for the explanation.

Thanks,
Kurt