[Bug libc/30558] SIGEV_THREAD is badly implemented

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30558

--- Comment #27 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Stas Sergeev from comment #26)
> But if you don't provide any checking
> method, then I won't be able to select
> between your code and timerfd impl, so
> I will have to keep using the timerfd
> code instead of yours.

Usually, if the semantic changes, a new symbol is provided to avoid
compatibility issues (I am not sure if it were the case). But for
implementation detail that changes over the release, glibc does not provide
additional user-visible defines that are not defined by standards (such any C
TS/extension). Bleeding out implementation details has added a lo of
maintainability burden.

You can always check the release to tie, but non-visible user changes might be
backported.

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