Load native_extension_loader only from synchronization.rb

Author: pitr-ch

lib/concurrent/atomic/atomic_boolean.rb

@@ -1,5 +1,5 @@
 require 'concurrent/atomic/mutex_atomic_boolean'
-require 'concurrent/utility/native_extension_loader'
+require 'concurrent/synchronization'
 
 module Concurrent
 
@@ -48,7 +48,7 @@ module Concurrent
   #   Explicitly sets the value to false.
   #
   #   @return [Boolean] true is value has changed, otherwise false
-  
+
   ###################################################################
 
   # @!macro [new] atomic_boolean_public_api

lib/concurrent/atomic/atomic_fixnum.rb

@@ -1,5 +1,5 @@
 require 'concurrent/atomic/mutex_atomic_fixnum'
-require 'concurrent/utility/native_extension_loader'
+require 'concurrent/synchronization'
 
 module Concurrent
 

lib/concurrent/atomic/atomic_reference.rb

@@ -1,4 +1,4 @@
-require 'concurrent/utility/native_extension_loader'
+require 'concurrent/synchronization'
 require 'concurrent/utility/engine'
 require 'concurrent/atomic_reference/concurrent_update_error'
 require 'concurrent/atomic_reference/mutex_atomic'

lib/concurrent/atomic/semaphore.rb

@@ -1,5 +1,5 @@
 require 'concurrent/atomic/mutex_semaphore'
-require 'concurrent/utility/native_extension_loader'
+require 'concurrent/synchronization'
 
 module Concurrent
 

lib/concurrent/atomic_reference/jruby.rb

@@ -1,4 +1,4 @@
-require 'concurrent/utility/native_extension_loader'
+require 'concurrent/synchronization'
 
 if defined?(Concurrent::JavaAtomicReference)
   require 'concurrent/atomic_reference/direct_update'

lib/concurrent/atomic_reference/ruby.rb

@@ -1,5 +1,5 @@
 if defined? Concurrent::CAtomicReference
-  require 'concurrent/utility/native_extension_loader'
+  require 'concurrent/synchronization'
   require 'concurrent/atomic_reference/direct_update'
   require 'concurrent/atomic_reference/numeric_cas_wrapper'
 

lib/concurrent/utility/native_extension_loader.rb

@@ -1,7 +1,11 @@
-require 'concurrent/synchronization/abstract_object' # must be loaded before JRuby extensions
 require 'concurrent/utility/engine'
 
 module Concurrent
+
+  unless defined? Synchronization::AbstractObject
+    raise 'native_extension_loader loaded before Synchronization::AbstractObject'
+  end
+
   module Utility
 
     # @!visibility private