os/log.c thread safety

[Jeremy Huddleston Sequoia]

I noticed a data race in XQuartz.  We call ErrorF in a couple places off of the main server thread.  I could fix it by simply moving this logging onto the server thread (or not doing it with os/log), but with the split of InputThread off of MainThread, I'm wondering if it would be better to instead make ErrorF thread safe.

Thoughts?

--Jeremy


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