Re: [Qemu-devel] [PATCH 2/7] store thread-specific env information

[Andreas Färber]

Am 29.11.2009 um 16:42 schrieb Avi Kivity:

> On 11/29/2009 05:38 PM, Andreas Färber wrote:
> > Am 29.11.2009 um 16:29 schrieb Avi Kivity:
> >
> > > On 11/26/2009 07:24 PM, Glauber Costa wrote:
> > > > Since we'll have multiple cpu threads, at least for kvm, we need  
> > > > a way to store
> > > > and retrieve the CPUState associated with the current execution  
> > > > thread.
> > > > For the I/O thread, this will be NULL.
> > > >
> > > > I am using pthread functions for that, for portability, but we  
> > > > could as well
> > > > use __thread keyword.
> > >
> > > Where is __thread not supported?
> >
> > Apple, Sun.
>
> Well, pthread_getspecific is around 130 bytes of code, whereas  
> __thread is just on instruction.  Maybe we should support both.

Maybe. Mono does so, they have some autoconf-based check plus a  
configure switch --with-tls={pthread|__thread} to override.

Andreas