[Mesa-dev] Enable GLX TLS by default in Mesa?

[Ian Romanick]

On 08/13/2013 12:04 PM, Vedran Rodic wrote:
> On Tue, Aug 13, 2013 at 7:19 PM, Kenneth Graunke <kenneth at whitecape.org> wrote:
>>
>>
>> As far as I know, --enable-glx-tls just makes things more efficient.
>>
>> Nothing should *rely* on it, or even be able to detect it...
>
> Dota 2 crashes without that option when loading the actual game map. I
> assumed it adds thread safety.

With TLS the context pointer and the dispatch pointer are stored in 
thread local storage.  Looking them up (which happens on every GL call) 
is "fast."

Without TLS the context pointer and the dispatch pointer are stored 
using pthread_setspecific / pthread_getspecific.  Looking them up is 
hella slow.

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