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require 'test/unit'
require 'jruby'
class TestThreadService < Test::Unit::TestCase
GC_COUNT = 10
def test_ruby_thread_leaks
svc = JRuby.runtime.thread_service
start_rt = svc.ruby_thread_map.size
# spin up 100 threads and join them
(1..10).to_a.map {Thread.new {}}.map(&:join)
# access maps and GC a couple times to flush things out
svc.ruby_thread_map.size
GC_COUNT.times {JRuby.gc}
# confirm the size goes back to the same
assert_equal start_rt, svc.ruby_thread_map.size
end
def test_java_thread_leaks
svc = JRuby.runtime.thread_service
start_rt = svc.ruby_thread_map.size
# spin up 100 Java threads and join them
(1..10).to_a.map {t = java.lang.Thread.new {}; t.start; t}.map(&:join)
# access maps and GC a couple times to flush things out
svc.ruby_thread_map.size
GC_COUNT.times {JRuby.gc}
# confirm the size goes back to the same
assert_equal start_rt, svc.ruby_thread_map.size
end
def test_java_threads_in_thread_list
svc = JRuby.runtime.thread_service
start_list = Thread.list
# spin up 100 Java threads and wait for them all to be ready
state_ary = [false] * 10
threads = (0..9).to_a.map do |i|
t = java.lang.Thread.new do
state_ary[i] = true
Thread.pass while state_ary[i]
end
t.start
t
end
# wait for them all to be running
Thread.pass until state_ary.all?
# check that Thread.list contains 100 more threads
assert_equal start_list.size + 10, Thread.list.size
# shut down all threads and wait for them to terminate
0.upto(9) {|i| state_ary[i] = false}
threads.map(&:join)
threads = nil
# access maps and GC a couple times to flush things out
svc.ruby_thread_map.size
GC_COUNT.times {JRuby.gc}
# confirm the thread list is back to what it was
assert_equal start_list, Thread.list
end
end
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