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Feature #9420

Updated by nobu (Nobuyoshi Nakada) about 6 years ago

Since we added use of writev in r44618, we should make warn/puts atomic.
It would make development of multiprocess/multithreaded processes easier,
I think it was intended to be atomic based on old comments in io.c:

```
- /*
- * xxx: use writev to avoid double write if available
- * writev may help avoid context switch between "a" and "\n" in
- * STDERR.puts "a" [ruby-dev:25080] (rebroken since native threads
- * introduced in 1.9)
- */
```

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