Hi Charles!
Sorry for the late response.
As others have noted, in this snippet, #apply is called on a sequential queue
(queues created by Queue.new are always sequential), therefore there shouldn't
be any problem here. If the queue was concurrent, however, there would be a
thread safety issue.
I think this rdoc snippet should be rewritten to avoid confusion.
I see that you're wrapping a GCD-like interface in JRuby, it's very cool! I
assume you want your interface to be cross platform, but in the case of JRuby
running on Mac OS X, maybe we can extract our code as a C extension, this way
JRuby would use the "system" GCD. Maybe we can also work together on creating a
good test/spec suite for the GCD interface, because it's currently lacking.
Laurent
On Jan 21, 2011, at 9:57 PM, Charles Oliver Nutter wrote:
> 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
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