[Patch 00/02] mieq threading prep

[Jeremy Huddleston]

These are two fairly straight forward patches I'd like to give someone  
a chance to comment on.  In a single-thread Xserver, these patches  
should have no effect, but they make the code a little more friendly  
to Tiago's threading patches (and this is what we're already doing in  
the apple branches).

The first only increments mieqEventQueue.tail when the data is in the  
queue (since mieqProcessInputEvents assumes the data to be valid if  
tail is incremented).

The second moves a hunk in mieqProcessInputEvents after we increment  
mieqEventQueue.head, so we don't need to hold a mutex for an  
unnecessarily.

If nobody pipes up in the next few days, I'll be pushing them into  
master.

Thanks,
Jeremy

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