Issue #3944 has been updated by zzak (Zachary Scott). Julien please see ruby-core:45849 and also read up on the wiki: http://bugs.ruby-lang.org/projects/ruby/wiki/HowToRequestFeatures ---------------------------------------- Feature #3944: Add Fiber#root? method https://bugs.ruby-lang.org/issues/3944#change-37225 Author: mperham (Mike Perham) Status: Assigned Priority: Normal Assignee: ko1 (Koichi Sasada) Category: Target version: Next Major =begin Since the root fiber is treated differently than other Fibers (e.g. you can't yield from the root), code which can optionally use fibers for high-performance IO (in my case, the Mysql2 driver) needs Fiber#root? to know when it can use Fibers to execute a query versus using a standard blocking call. =end -- http://bugs.ruby-lang.org/