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module Concurrent
module Synchronization
# @!visibility private
module MriAttrVolatile
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
def attr_volatile(*names)
names.each do |name|
ivar = :"@volatile_#{name}"
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{name}
#{ivar}
end
def #{name}=(value)
#{ivar} = value
end
RUBY
end
names.map { |n| [n, :"#{n}="] }.flatten
end
end
def full_memory_barrier
# relying on undocumented behavior of CRuby, GVL acquire has lock which ensures visibility of ivars
# https://github.com/ruby/ruby/blob/ruby_2_2/thread_pthread.c#L204-L211
end
end
# @!visibility private
# @!macro internal_implementation_note
class MriObject < AbstractObject
include MriAttrVolatile
def initialize
# nothing to do
end
end
end
end
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