Nvidia, TLS and __thread keyword -- an observation

[Julian Elischer]

Marcel, are you (or do you kno of anyone else) doing anything on TLS?

On Wed, 18 Jun 2003, Marcel Moolenaar wrote:

> On Wed, Jun 18, 2003 at 02:05:04AM -0700, Terry Lambert wrote:
> > Marcel Moolenaar wrote:
> > > On Wed, Jun 18, 2003 at 07:48:09AM +0800, David Xu wrote:
> > > > I believe this will add overhead to thread creating and destroying,
> > > > How fast an RTLD can be in this case ?
> > > 
> > > In the dynamic TLS model you would like to delay the creation of
> > > the TLS space. Normally __tls_get_addr() gets used for this. In
> > > the static TLS model you allocate the TLS when you llocate the
> > > thread control structure.
> > 
> > Lazy binding in this context doesn't make a lot of sense.
> 
> It does. In a process with 1000 threads where 1 thread does
> a dlopen(), you don't want to create 999 TLS spaces if they're
> not going to be used. Besides time, this also is a space
> issue.
> 
> Note also that I don't advocate what I think we should do, but
> what the specification is designed for. People have put some
> thought in it...
> 
> -- 
>  Marcel Moolenaar	  USPA: A-39004		 marcel at xcllnt.net
>