[MacRuby-devel] Thread safety in apply example?

[Charles Oliver Nutter]

I'm curious about this example in Queue#apply's rdoc:

 *     gcdq = Dispatch::Queue.new('doc')
 *     @result = []
 *     gcdq.apply(5) {|i| @result[i] = i*i }
 *     p @result  #=> [0, 1, 4, 9, 16, 25]

apply is said to issue the jobs in parallel, so this would be making
concurrent updates to the @result array. Are simple arrays in MacRuby
thread-safe?

- Charlie