Issue #4647 has been updated by ko1 (Koichi Sasada). Status changed from Assigned to Closed I closed this ticket because it is duplicated. ---------------------------------------- Feature #4647: [PATCH] io/wait: add IO#wait_writable method https://bugs.ruby-lang.org/issues/4647#change-31662 Author: normalperson (Eric Wong) Status: Closed Priority: Low Assignee: nobu (Nobuyoshi Nakada) Category: ext Target version: 2.0.0 This is easier to use than IO.select for a single IO object and is immune to the limitations/innefficiency of select() on platforms where poll/ppoll is available. -- http://bugs.ruby-lang.org/