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require 'concurrent/synchronization/safe_initialization'
module Concurrent
# @!macro atomic_boolean
# @!visibility private
# @!macro internal_implementation_note
class MutexAtomicBoolean
extend Concurrent::Synchronization::SafeInitialization
# @!macro atomic_boolean_method_initialize
def initialize(initial = false)
super()
@Lock = ::Mutex.new
@value = !!initial
end
# @!macro atomic_boolean_method_value_get
def value
synchronize { @value }
end
# @!macro atomic_boolean_method_value_set
def value=(value)
synchronize { @value = !!value }
end
# @!macro atomic_boolean_method_true_question
def true?
synchronize { @value }
end
# @!macro atomic_boolean_method_false_question
def false?
synchronize { !@value }
end
# @!macro atomic_boolean_method_make_true
def make_true
synchronize { ns_make_value(true) }
end
# @!macro atomic_boolean_method_make_false
def make_false
synchronize { ns_make_value(false) }
end
protected
# @!visibility private
def synchronize
if @Lock.owned?
yield
else
@Lock.synchronize { yield }
end
end
private
# @!visibility private
def ns_make_value(value)
old = @value
@value = value
old != @value
end
end
end
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