Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers

[Paolo Bonzini]

On 08/17/2011 10:28 AM, Blue Swirl wrote:
> > > >>  The actual use of TLS within QEMU on POSIX systems will be optional
> > > >>  though, right?
> > >
> > >  Actually, TLS is already mandatory for both POSIX and Win32 systems.
> Not true, we have avoided TLS.
>
> > >  This patch tries to improve the situation on Windows, both by allowing older
> > >  GCC versions, and by making TLS faster.  On ELF systems, TLS has been
> > >  supported by GCC for perhaps 10 years, there's no reason to care.
> GCC may support it but it can't use it on a platform if the other
> parts are missing (libc etc.).

Again, welcome to the 21st century.  There's no way you can have 
something that is scalable and not use fast TLS.  IMNSHO if OpenBSD 
still wants to miss features that all sane OSes (and Windows _is_ sane) 
have nowadays, fine, it will be stuck with an old QEMU or with 
single-thread user-level emulation.

As far as portability is concerned, FreeBSD provides a much more 
interesting target.

Paolo