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describe "Colon2 lookup with changing receiver under concurrent load" do
it "never fails to produce the correct value" do
foo = Module.new do
const_set :Bar, 1
end
baz = Module.new do
const_set :Bar, 2
end
obj1 = Class.new do
define_method :module do
foo
end
def value
1
end
end.new
obj2 = Class.new do
define_method :module do
baz
end
def value
2
end
end.new
Thread.abort_on_exception = true
obj3 = Object.new
def obj3.casething(obj)
raise "values did not match" unless obj.value == obj.module::Bar
end
# The logic here causes the same colon2 to flip between two different
# target modules, which in JRuby 1.7.4 and lower could sometimes return
# the wrong result due to a data race in the caching logic. This was fixed
# in JRuby 1.7.5.
ary = []
50.times { ary << Thread.new { 10000.times { obj3.casething(obj1); obj3.casething(obj2) } } }
lambda { ary.each(&:join) }.should_not raise_error
end
end
|
