[Xcb] [Patch] Fix deadlock seen with wine

[Uli Schlachter]

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Hi,

the attached patch fixes [0]. I came up with another approach which avoids the
theoretical deadlock in the original patch where a thread was writing without
trying to read from the socket. Hopefully the commit message and commits
explain the logic well enough. And yes, I am evil and attach patches.

So what do you guys think?

Cheers,
Uli

[0]: https://bugs.freedesktop.org/show_bug.cgi?id=54671
- -- 
- - Captain, I think I should tell you I've never
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