Feature #9420: warn and puts should be atomic

• Status: Closed
• Assignee: Glass_saga (Masaki Matsushita)
• Target version: -

[normalperson (Eric Wong)]

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)
-        */

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)

[Glass_saga (Masaki Matsushita)]

• Assignee set to Glass_saga (Masaki Matsushita)

[shyouhei (Shyouhei Urabe)]

• Related to Feature #9323: IO#writev added

[nobu (Nobuyoshi Nakada)]

• Has duplicate Feature #14042: IO#puts: use writev if available added

[naruse (Yui NARUSE)]

• Target version deleted (2.2.0)

[Glass_saga (Masaki Matsushita)]

• Status changed from Open to Closed

For now, warn and puts already use writev if available.