[PATCH RFC 0/3] nptl: Introduce and use FUTEX_LOCK_PI2
Florian Weimer
fweimer@redhat.com
Tue Jun 22 07:29:21 GMT 2021
* 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.
Thanks,
Florian
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