os/log.c thread safety

[Keith Packard]

Jeremy Huddleston Sequoia <jeremyhu at apple.com> writes:

> FWIW, the issues surround these globals:
>     bufferUnused
>     bufferPos
>     LogSWrite.newline

How about creating a separate mutex for these? It looks like we can do
some minor reordering of code so that the mutex wouldn't need to be held
across system calls. That should make it "safe enough".

-- 
-keith
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