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Feature #9420

Updated by nobu (Nobuyoshi Nakada) over 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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