remove deprecated Module#synchronize from ActiveSupport

activesupport/lib/active_support/core_ext/module.rb

@@ -5,8 +5,7 @@
 require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/module/attr_internal'
 require 'active_support/core_ext/module/delegation'
-require 'active_support/core_ext/module/synchronization'
 require 'active_support/core_ext/module/deprecation'
 require 'active_support/core_ext/module/remove_method'
 require 'active_support/core_ext/module/method_names'
-require 'active_support/core_ext/module/qualified_const'
\ No newline at end of file
+require 'active_support/core_ext/module/qualified_const'

activesupport/lib/active_support/core_ext/module/synchronization.rb

-require 'thread'
-require 'active_support/core_ext/module/aliasing'
-require 'active_support/core_ext/array/extract_options'
-require 'active_support/core_ext/module/deprecation'
-
-class Module
-  # Synchronize access around a method, delegating synchronization to a
-  # particular mutex. A mutex (either a Mutex, or any object that responds to
-  # #synchronize and yields to a block) must be provided as a final :with option.
-  # The :with option should be a symbol or string, and can represent a method,
-  # constant, or instance or class variable.
-  # Example:
-  #   class SharedCache
-  #     @@lock = Mutex.new
-  #     def expire
-  #       ...
-  #     end
-  #     synchronize :expire, :with => :@@lock
-  #   end
-  def synchronize(*methods)
-    options = methods.extract_options!
-    unless options.is_a?(Hash) && with = options[:with]
-      raise ArgumentError, "Synchronization needs a mutex. Supply an options hash with a :with key as the last argument (e.g. synchronize :hello, :with => :@mutex)."
-    end
-
-    methods.each do |method|
-      aliased_method, punctuation = method.to_s.sub(/([?!=])$/, ''), $1
-
-      if method_defined?("#{aliased_method}_without_synchronization#{punctuation}")
-        raise ArgumentError, "#{method} is already synchronized. Double synchronization is not currently supported."
-      end
-
-      module_eval(<<-EOS, __FILE__, __LINE__ + 1)
-        def #{aliased_method}_with_synchronization#{punctuation}(*args, &block)     # def expire_with_synchronization(*args, &block)
-          #{with}.synchronize do                                                    #   @@lock.synchronize do
-            #{aliased_method}_without_synchronization#{punctuation}(*args, &block)  #     expire_without_synchronization(*args, &block)
-          end                                                                       #   end
-        end                                                                         # end
-      EOS
-
-      alias_method_chain method, :synchronization
-    end
-  end
-  deprecate :synchronize
-end

railties/guides/source/active_support_core_extensions.textile

@@ -772,30 +772,6 @@ Absolute qualified constant names like +::Math::PI+ raise +NameError+.
 
 NOTE: Defined in +active_support/core_ext/module/qualified_const.rb+.
 
-h4. Synchronization
-
-The +synchronize+ macro declares a method to be synchronized:
-
-<ruby>
-class Counter
-  @@mutex = Mutex.new
-  attr_reader :value
-
-  def initialize
-    @value = 0
-  end
-
-  def incr
-    @value += 1 # non-atomic
-  end
-  synchronize :incr, :with => '@@mutex'
-end
-</ruby>
-
-The method receives the name of an action, and a +:with+ option with code. The code is evaluated in the context of the receiver each time the method is invoked, and it should evaluate to a +Mutex+ instance or any other object that responds to +synchronize+ and accepts a block.
-
-NOTE: Defined in +active_support/core_ext/module/synchronization.rb+.
-
 h4. Reachable
 
 A named module is reachable if it is stored in its corresponding constant. It means you can reach the module object via the constant.