Do threads within single process share FILE streams?

[Freddie Chopin]

Hello!

I know this list is not perfect for such question, but I'm sure you know 
the answer (; I really couldn't find anything definitive on the internet...

Do threads within single process share FILE streams? I know that threads 
share file descriptors, but do they share FILE streams too? Newlib's 
source suggests that FILE streams are _NOT_ shared between threads - 
they are allocated in _reent structure, which is (I assume) per thread. 
But on the other hand - if FILE streams are not shared (implicitly), 
then the locking (with _newlib_flockfile_start() and 
_newlib_flockfile_end()) is mostly pointless and would make sense only 
when you share the FILE streams explicitly by using the same FILE 
variable from multiple threads, right?

Thanks in advance!

Regards,
FCh