On 2012-03-19 09:17, Johannes Pfau wrote:
Am Sun, 18 Mar 2012 22:06:41 +0100
schrieb Jacob Carlborg<d...@me.com>:
Yes, but OSX still uses emulated tls. With the way dmd emulates TLS
it's possible to remove __tls_beg and __tls_end, but for native TLS
those symbols are still needed. However, as the runtime linker (ld.so)
has got the necessary information, it's possible that OSX even offers a
API to access it. It's just that most C libraries don't provide a way to
get the TLS segment sizes and the (per thread) addresses of the TLS
blocks.
The dyld library on Mac OS X provides access to segments and sections.
But since the dynamic loader needs can get this information it should be
possible for other applications to get this information as well?
Just walk through the object file and find the necessary segments?
Mac OS X 10.7 + supports TLS natively. But I don't know where to find
documentation about it. It always possible to look at the source code.
Then it's probably already supported by GCC/GDC. But having working
emulated TLS would be nice for many other architectures. Native TLS is
not that widespread.
Yeah, don't know about GCC though, Apple cares less and less about GCC
and putting all their effort in to LLVM and Clang. Ok, I didn't know how
widespread TLS was.
--
/Jacob Carlborg
