[PATCH] remove 1.8, <= 1.9.1 fallback for missing IO#autoclose=

[Eric Wong <e@80x24.org>]

We're requiring Ruby 1.9.3+, so we can safely depend
on IO#autoclose= being available in 1.9+ and shave off
some bloat.
---
 lib/unicorn/http_server.rb   |  9 +++------
 lib/unicorn/socket_helper.rb | 14 +-------------
 2 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index e0c0370..8a295f0 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -156,9 +156,6 @@ class Unicorn::HttpServer
 
     LISTENERS.delete_if do |io|
       if dead_names.include?(sock_name(io))
-        IO_PURGATORY.delete_if do |pio|
-          pio.fileno == io.fileno && (pio.close rescue nil).nil? # true
-        end
         (io.close rescue nil).nil? # true
       else
         set_server_sockopt(io, listener_opts[sock_name(io)])
@@ -239,7 +236,7 @@ class Unicorn::HttpServer
     begin
       io = bind_listen(address, opt)
       unless Kgio::TCPServer === io || Kgio::UNIXServer === io
-        prevent_autoclose(io)
+        io.autoclose = false
         io = server_cast(io)
       end
       logger.info "listening on addr=#{sock_name(io)} fd=#{io.fileno}"
@@ -453,7 +450,7 @@ class Unicorn::HttpServer
       (3..1024).each do |io|
         next if listener_fds.include?(io)
         io = IO.for_fd(io) rescue next
-        prevent_autoclose(io)
+        io.autoclose = false
         io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
       end
 
@@ -770,7 +767,7 @@ class Unicorn::HttpServer
     inherited = ENV['UNICORN_FD'].to_s.split(',').map do |fd|
       io = Socket.for_fd(fd.to_i)
       set_server_sockopt(io, listener_opts[sock_name(io)])
-      prevent_autoclose(io)
+      io.autoclose = false
       logger.info "inherited addr=#{sock_name(io)} fd=#{fd}"
       server_cast(io)
     end
diff --git a/lib/unicorn/socket_helper.rb b/lib/unicorn/socket_helper.rb
index 2ecf438..a4247ac 100644
--- a/lib/unicorn/socket_helper.rb
+++ b/lib/unicorn/socket_helper.rb
@@ -5,10 +5,6 @@ require 'socket'
 module Unicorn
   module SocketHelper
 
-    # prevents IO objects in here from being GC-ed
-    # kill this when we drop 1.8 support
-    IO_PURGATORY = []
-
     # internal interface, only used by Rainbows!/Zbatery
     DEFAULTS = {
       # The semantics for TCP_DEFER_ACCEPT changed in Linux 2.6.32+
@@ -36,14 +32,6 @@ module Unicorn
       [ af_name, nil ].pack('a16a240')
     end if RUBY_PLATFORM =~ /freebsd/ && Socket.const_defined?(:SO_ACCEPTFILTER)
 
-    def prevent_autoclose(io)
-      if io.respond_to?(:autoclose=)
-        io.autoclose = false
-      else
-        IO_PURGATORY << io
-      end
-    end
-
     def set_tcp_sockopt(sock, opt)
       # just in case, even LANs can break sometimes.  Linux sysadmins
       # can lower net.ipv4.tcp_keepalive_* sysctl knobs to very low values.
@@ -161,7 +149,7 @@ module Unicorn
         sock.setsockopt(:SOL_SOCKET, :SO_REUSEPORT, 1)
       end
       sock.bind(Socket.pack_sockaddr_in(port, addr))
-      prevent_autoclose(sock)
+      sock.autoclose = false
       Kgio::TCPServer.for_fd(sock.fileno)
     end
 
-- 
EW