Re: [Cppcms-users] Getting ready to 1.0.5

[Joerg S. <jo...@br...>]

On Sun, Oct 26, 2014 at 01:25:45PM +0000, Artyom Beilis wrote:
> BUT... I discovered a huge issue with TLS implementation
> in the pthreads library that requires workaround.
> 
> If you run pthread_key_create more than 255 times
> (even if you call pthread_key_delete and release the keys)
> the key creation.
> 256  is the total number of TLS keys allowed at NetBSD. 
> 
> 
> However pthread_key_delete does not "free" the spot - it
> caused all ICU tests that use TLS for optimization
> fail and it may cause other problems that aren't
> visible right now.

That one has been addressed after NetBSD 6 has been branches. The core
of the issue is that pthread_key_destroy was added as an afterthought
with some non-trivial implications for how it behaves on existing
threads. Please avoid the term TLS when talking about pthread_key -- it
is normally used for __thread and the related C++11 feature.

Joerg