[Mesa-dev] [PATCH] r600g-llvm: Crude fix for a race in initialization of the llvm backend

[Mathias Fröhlich]

Hi,

This change adds application global locking around compiling an r600 llvm 
shader. This fixes a race condition/crash that I observe when shaders are 
concurrently compiled from different contexts in different threads.
The fix is crude as it just guards the whole compile with a global mutex, but 
up to now I did not have enough time to understand the real reason that must 
be somewhere in the way r600g initializes the llvm backend. And since we have 
a pending public release we will better have a curde fix than a known bug.
Better solutions welcome!

I will post a piglit test in the next minutes that exercises this problem with 
a high probability at least here on my test machine.

Please review

Mathias
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