_glthread_TSD problem [was: display lists broken in Mesa maybe due to glapi dispatch changes (?), and an Xthreads problem]

[Ian Romanick]

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Adam Jackson wrote:

> You _have_ to have it defined correctly.  The Xlib ABI changes based on 
> whether it was built with XTHREADS support.  We didn't have to define 
> XTHREADS in an installed header file in the monolith because everything was 
> built in the same pass and imake would define it for us.  This is no longer 
> the case.
> 
> The s/XTHREADS/USE_&/ conversion is correct, to the extent that it lets you 
> choose whether your libGL is threadsafe.  Whether we should allow people to 
> do that is perhaps debatable.

libGL is still thread-safe.  It just uses -DPTHREADS instead.  The
pthreads paths tend to be slightly more efficient and match the way the
drivers get built.
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