Darwin kqueue

.rubocop.yml

@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.2
+  TargetRubyVersion: 2.3
   DisplayCopNames: true
 
 Layout/SpaceInsideBlockBraces:

appveyor.yml

@@ -11,7 +11,6 @@ environment:
   - RUBY_VERSION: 24-x64
   - RUBY_VERSION: 23-x64
   - RUBY_VERSION: 23
-  - RUBY_VERSION: 22
 
 init:
   - ps: |
@@ -23,16 +22,11 @@ init:
 
 install:
   - SET RAKEOPT=-rdevkit
-  - ps: |
-      if ($env:RUBY_VERSION -eq '_trunk' -or $env:RUBY_VERSION -ge '23' ) {
-        gem update --system --conservative --no-document
-      } else {
-        gem update --system  2.7.9 --conservative --no-document        
-      }
+  - gem update --system --conservative --no-document
   - ruby -v
   - gem -v
   - bundle -v
-  - bundle install --path vendor\bundle
+  - bundle install --path vendor\bundle --without development
 
 test_script:
   - bundle exec rake spec

ext/libev/ev.c

@@ -40,6 +40,10 @@
 /* ########## NIO4R PATCHERY HO! ########## */
 #include "ruby.h"
 #include "ruby/thread.h"
+
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+#endif
 /* ######################################## */
 
 /* this big block deduces configuration from config.h */
@@ -2765,16 +2769,17 @@ ev_recommended_backends (void) EV_NOEXCEPT
 {
   unsigned int flags = ev_supported_backends ();
 
-#ifndef __NetBSD__
+#if defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_14)
+  /* apple has a poor track record but post 10.12.2 it seems to work sufficiently well */
+#elif defined(__NetBSD__)
   /* kqueue is borked on everything but netbsd apparently */
   /* it usually doesn't work correctly on anything but sockets and pipes */
-  flags &= ~EVBACKEND_KQUEUE;
-#endif
-#ifdef __APPLE__
+#else
   /* only select works correctly on that "unix-certified" platform */
   flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
   flags &= ~EVBACKEND_POLL;   /* poll is based on kqueue from 10.5 onwards */
 #endif
+
 #ifdef __FreeBSD__
   flags &= ~EVBACKEND_POLL;   /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
 #endif

lib/nio.rb

@@ -18,16 +18,16 @@ def self.engine
   require "nio/monitor"
   require "nio/selector"
   require "nio/bytebuffer"
-  NIO::ENGINE = "ruby".freeze
+  NIO::ENGINE = "ruby"
 else
   require "nio4r_ext"
 
   if defined?(JRUBY_VERSION)
     require "java"
     require "jruby"
     org.nio4r.Nio4r.new.load(JRuby.runtime, false)
-    NIO::ENGINE = "java".freeze
+    NIO::ENGINE = "java"
   else
-    NIO::ENGINE = "libev".freeze
+    NIO::ENGINE = "libev"
   end
 end

lib/nio/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module NIO
-  VERSION = "2.4.0".freeze
+  VERSION = "2.4.0"
 end

nio4r.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.version       = NIO::VERSION
 
-  spec.required_ruby_version = ">= 2.2.2"
+  spec.required_ruby_version = ">= 2.3"
 
   if defined? JRUBY_VERSION
     spec.files << "lib/nio4r_ext.jar"