[Mesa-dev] [PATCH] st/wgl: Release stw_framebuffer::mutex after pbuffer creation

[Mathias Fröhlich]

Hi,

We have experienced a problem with the win32 wgl pbuffer implementation using 
gallium together with threading.

This attached change releases the stw_framebuffer::mutex past creation of
the pbuffer stw_framebuffer. Without this change the pbuffers
lock is never released. Since on win32 mutexes are recursive, this
does not hurt as long as all actions on a context are done from
the same thread. But if, for example, context creation happens in
a different thread than usage, every access to the context will
block for ever.

This actually fixes the observed problems in an application that really creates 
the context in a different thread than it makes use of the pbuffer.

Please review and may be apply if its ok.
Thanks!

Mathias
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