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require 'concurrent/synchronization'
require 'concurrent/atomic_reference/direct_update'
require 'concurrent/atomic_reference/numeric_cas_wrapper'
module Concurrent
# @!macro atomic_reference
#
# @!visibility private
# @!macro internal_implementation_note
class MutexAtomicReference < Synchronization::LockableObject
include Concurrent::AtomicDirectUpdate
include Concurrent::AtomicNumericCompareAndSetWrapper
# @!macro atomic_reference_method_initialize
def initialize(value = nil)
super()
synchronize { ns_initialize(value) }
end
# @!macro atomic_reference_method_get
def get
synchronize { @value }
end
alias_method :value, :get
# @!macro atomic_reference_method_set
def set(new_value)
synchronize { @value = new_value }
end
alias_method :value=, :set
# @!macro atomic_reference_method_get_and_set
def get_and_set(new_value)
synchronize do
old_value = @value
@value = new_value
old_value
end
end
alias_method :swap, :get_and_set
# @!macro atomic_reference_method_compare_and_set
def _compare_and_set(old_value, new_value)
synchronize do
if @value.equal? old_value
@value = new_value
true
else
false
end
end
end
protected
def ns_initialize(value)
@value = value
end
end
end
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