#795: GCD inconsistently copies local variables inside blocks
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Reporter: ernest.prabha...@… | Owner: lsansone...@…
Type: defect | Status: new
Priority: critical | Milestone:
Component: MacRuby | Keywords:
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The expectation is that Ruby blocks will have their local variables copied
before being passed to GCD, to avoid errors from accessing them after they
are destroyed.
However, that does not seem to always happen. For example:
$ macruby -e 'i=0; Dispatch::Queue.new("i").sync {i = 42}; puts i'
returns '0' as expected. However, this does not:
$ macirb
irb(main):001:0> i=0; Dispatch::Queue.new("i").sync {i = 42}; puts i
42
=> nil
It appears to be copied properly in the block_spec.rb test:
it "should create const copies of dynamic (local) variables" do
i = 42
@q.sync {i = 1}
i.should == 42
end
But not in the README.rdoc for the dispatch module (aka
dispatch_methods.rb sample):
n = 0
job = Dispatch::Job.new { n = 21 }
job.join
puts "n (after): #{n} => 0?!?" # [returns 21, not 0]
Any suggestions?
--
Ticket URL: <http://www.macruby.org/trac/ticket/795>
MacRuby <http://macruby.org/>
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