enable frozen_string_literal for Ruby 2.3+

There are likely yet-to-be-discovered bugs in here.
Also, keeping explicit #freeze calls for 2.2 users, since most
users have not migrated to 2.3, yet.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/yahns/queue_epoll.rb b/lib/yahns/queue_epoll.rb
index c685fae..ba32bdc 100644
--- a/lib/yahns/queue_epoll.rb
+++ b/lib/yahns/queue_epoll.rb
@@ -1,6 +1,7 @@
 # -*- encoding: binary -*-
 # Copyright (C) 2013-2015 all contributors <yahns-public@yhbt.net>
 # License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+# frozen_string_literal: true
 #
 # This is the dangerous, low-level epoll interface for sleepy_penguin
 # It is safe as long as you're aware of all potential concurrency
@@ -32,7 +33,7 @@ class Yahns::Queue < SleepyPenguin::Epoll::IO # :nodoc:
   end
 
   def thr_init
-    Thread.current[:yahns_rbuf] = ""
+    Thread.current[:yahns_rbuf] = ''.dup
     Thread.current[:yahns_fdmap] = @fdmap
     Thread.current[:yahns_queue] = self
   end