OpenGL and the LinuxThreads pthread_descr structure

[Ulrich Drepper]

On Thu, 2002-05-16 at 20:08, Gareth Hughes wrote:
>
> > Beside, I don't understand why you react like this.  Using __thread is
> > the best you can ever get.  It'll be portable (Solaris 9 already has the
> > support as well) and it's faster than anything you can get to access the
> > data.
> 
> I disagree that __thread is the best you can ever get.  In the best 
> case, you have an extra load and subtraction before you have the address 
> of a thread-local variable.  In the worst case, you have a function call 
> in there as well.

If you define your variable correctly using __thread can be as efficient
as anything else.


But this all is irrelevant: once I have a bit of time glibc will switch
to use the __thread mechanism for all the internal thread-local
variables.  There will be no special block for variables in the thread
descriptor.  Using __thread is a structured way to get such
functionality.  It doesn't require synchronization with other ABIs and
that's the most important thing.

-- 
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