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require 'concurrent/synchronization'
require 'concurrent/utility/native_integer'
module Concurrent
# @!macro atomic_fixnum
# @!visibility private
# @!macro internal_implementation_note
class MutexAtomicFixnum < Synchronization::LockableObject
# @!macro atomic_fixnum_method_initialize
def initialize(initial = 0)
super()
synchronize { ns_initialize(initial) }
end
# @!macro atomic_fixnum_method_value_get
def value
synchronize { @value }
end
# @!macro atomic_fixnum_method_value_set
def value=(value)
synchronize { ns_set(value) }
end
# @!macro atomic_fixnum_method_increment
def increment(delta = 1)
synchronize { ns_set(@value + delta.to_i) }
end
alias_method :up, :increment
# @!macro atomic_fixnum_method_decrement
def decrement(delta = 1)
synchronize { ns_set(@value - delta.to_i) }
end
alias_method :down, :decrement
# @!macro atomic_fixnum_method_compare_and_set
def compare_and_set(expect, update)
synchronize do
if @value == expect.to_i
@value = update.to_i
true
else
false
end
end
end
# @!macro atomic_fixnum_method_update
def update
synchronize do
@value = yield @value
end
end
protected
# @!visibility private
def ns_initialize(initial)
ns_set(initial)
end
private
# @!visibility private
def ns_set(value)
Utility::NativeInteger.ensure_integer_and_bounds value
@value = value
end
end
end
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