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require 'concurrent/utility/native_extension_loader' # load native parts first
require 'concurrent/utility/engine'
require 'concurrent/synchronization/full_memory_barrier'
module Concurrent
module Synchronization
# Volatile adds the attr_volatile class method when included.
#
# @example
# class Foo
# include Concurrent::Synchronization::Volatile
#
# attr_volatile :bar
#
# def initialize
# self.bar = 1
# end
# end
#
# foo = Foo.new
# foo.bar
# => 1
# foo.bar = 2
# => 2
#
# @!visibility private
module Volatile
def self.included(base)
base.extend(ClassMethods)
end
def full_memory_barrier
Synchronization.full_memory_barrier
end
module ClassMethods
if Concurrent.on_cruby?
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
elsif Concurrent.on_jruby?
def attr_volatile(*names)
names.each do |name|
ivar = :"@volatile_#{name}"
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{name}
::Concurrent::Synchronization::JRubyAttrVolatile.instance_variable_get_volatile(self, :#{ivar})
end
def #{name}=(value)
::Concurrent::Synchronization::JRubyAttrVolatile.instance_variable_set_volatile(self, :#{ivar}, value)
end
RUBY
end
names.map { |n| [n, :"#{n}="] }.flatten
end
else
warn 'Possibly unsupported Ruby implementation' unless Concurrent.on_truffleruby?
def attr_volatile(*names)
names.each do |name|
ivar = :"@volatile_#{name}"
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{name}
::Concurrent::Synchronization.full_memory_barrier
#{ivar}
end
def #{name}=(value)
#{ivar} = value
::Concurrent::Synchronization.full_memory_barrier
end
RUBY
end
names.map { |n| [n, :"#{n}="] }.flatten
end
end
end
end
end
end
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