#556: Subsequent calls to dispatch apply improperly access incorrect "self"
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Reporter: joshua.balla...@… | Owner: lsansone...@…
Type: defect | Status: new
Priority: blocker | Milestone:
Component: MacRuby | Keywords: GCD
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The following code:
{{{
class Array
def pmap(priority = :default, &block)
results = []
results_queue =
Dispatch::Queue.new("#{results.object_id}_access_queue")
Dispatch::Queue.concurrent(priority).apply(size) do |idx|
print "self.object_id #=> #{self.object_id}\n"
print "self[idx] #=> #{self[idx]}\n"
result = block[self[idx]]
print "result #=> #{result}\n"
results_queue.async do
results[idx] = result
end
end
results_queue.sync {}
results
end
end
test_ary = ('a'..'j').to_a
p test_ary
print "test_ary.object_id #=> #{test_ary.object_id}\n"
p test_ary.pmap {|i| i.upcase }
test_ary = (1..10).to_a
p test_ary
print "test_ary.object_id #=> #{test_ary.object_id}\n"
p test_ary.pmap {|i| i**2 }
}}}
...generates this output:
{{{
["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]
test_ary.object_id #=> 8594638688
self.object_id #=> 8594638688
self[idx] #=> a
result #=> A
self.object_id #=> 8594638688
self[idx] #=> e
result #=> E
self.object_id #=> 8594638688
self[idx] #=> f
result #=> F
self.object_id #=> 8594638688
self[idx] #=> g
result #=> G
self.object_id #=> 8594638688
self[idx] #=> h
result #=> H
self.object_id #=> 8594638688
self[idx] #=> i
self.object_id #=> 8594638688
result #=> I
self[idx] #=> b
self.object_id #=> 8594638688
self[idx] #=> j
result #=> J
result #=> B
self.object_id #=> 8594638688
self[idx] #=> c
result #=> C
self.object_id #=> 8594638688
self[idx] #=> d
result #=> D
["A", "B", "C", "D", "E", "F", "G", "H", "I", "J"]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
test_ary.object_id #=> 8591101024
self.object_id #=> 8594638688
self[idx] #=> a
result #=> A
self.object_id #=> 8591101024
self.object_id #=> 8591101024
self[idx] #=> 2
self[idx] #=> 3
result #=> 9
self.object_id #=> 8594638688
result #=> 4
self.object_id #=> 8591101024
self[idx] #=> f
self.object_id #=> 8591101024
self[idx] #=> 4
self.object_id #=> 8591101024
self[idx] #=> 5
result #=> F
self[idx] #=> 8
self.object_id #=> 8591101024
result #=> 16
self.object_id #=> 8591101024
self.object_id #=> 8591101024
result #=> 25
result #=> 64
self[idx] #=> 9
self[idx] #=> 10
self[idx] #=> 7
result #=> 81
result #=> 100
result #=> 49
[nil, 4, 9, 16, 25, nil, 49, 64, 81, 100]
}}}
Notice that, in the second call to #pmap, some of the iterations of
Dispatch::Queue#apply evaluate "self" as the "self" from the first call to
#pmap
--
Ticket URL: <http://www.macruby.org/trac/ticket/556>
MacRuby <http://macruby.org/>
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