> Issue #4463 has been reported by Eric Wong.
>
> ----------------------------------------
> Bug #4463: [PATCH] release GVL for fcntl() for operations that may block
> http://redmine.ruby-lang.org/issues/4463
>
> Author: Eric Wong
> Status: Open
> Priority: Normal
> Assignee:
> Category: core
> Target version: 1.9.x
> ruby -v: ruby 1.9.3dev (2011-03-03 trunk 31011) [x86_64-linux]
>
>
> Users of F_SETLKW may block the entire VM via IO#fcntl,
> release the GVL so other operations may continue.

Yeah.
It looks reasonable request. :)