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module ThreadSafe
module Util
# A fixed size array with volatile volatile getters/setters.
# Usage:
# arr = VolatileTuple.new(16)
# arr.volatile_set(0, :foo)
# arr.volatile_get(0) # => :foo
# arr.cas(0, :foo, :bar) # => true
# arr.volatile_get(0) # => :bar
class VolatileTuple
include Enumerable
Tuple = defined?(Rubinius::Tuple) ? Rubinius::Tuple : Array
def initialize(size)
@tuple = tuple = Tuple.new(size)
i = 0
while i < size
tuple[i] = AtomicReference.new
i += 1
end
end
def volatile_get(i)
@tuple[i].get
end
def volatile_set(i, value)
@tuple[i].set(value)
end
def compare_and_set(i, old_value, new_value)
@tuple[i].compare_and_set(old_value, new_value)
end
alias_method :cas, :compare_and_set
def size
@tuple.size
end
def each
@tuple.each {|ref| yield ref.get}
end
end
end
end
|
