Is ruby logger thread(process)-safe? at RubyConf 2013This document discusses the thread and process safety of the Ruby Logger. It was found that while Logger is thread-safe due to use of a mutex, it is not process-safe as the mutex does not work across processes. The author contributed a fix to Ruby core that uses flock to lock access to logs across processes, ensuring process-safe logging. The fix will be included in Ruby 2.1.0, making the standard
プロセスとかスレッドとかプロセス間通信とかについて書く場所
