Blogged by Ujihisa. Standard methods of programming and thoughts including Clojure, Vim, LLVM, Haskell, Ruby and Mathematics written by a Japanese programmer. github/ujihisa Usually Ruby's thread works well, but when you have to use thread-unsafe features like Dir.chdir, you need to use fork. How can you wait for the children processes certainly finish the given tasks? The answer is to use DRb. I'