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# We must ensure fibers finalize properly and do not leave a lot of garbage
# around nor leave threads running. This test attempts to brutalize the fiber
# subsystem and the JVM GC in order to prove that fibers are getting cleaned
# up. There may be a better way to do this.
require 'rspec'
describe "A Fiber that has been abandoned" do
it "cleans itself up properly" do
begin
thread_bean = java.lang.management.ManagementFactory.thread_mx_bean
max_threads = JRuby.runtime.fiber_executor.maximum_pool_size
# Thread count before fibers
thread_count = thread_bean.thread_count
# Attempt to create and abandon 10000 fibers. This should blow up quickly
# if they are not cleaning up their threads properly.
100.times do
100.times do
Fiber.new { Fiber.yield }.resume
end
JRuby.gc
end
# Allow GC and other threads plenty of time to clean up
10.times do
JRuby.gc
end
# Try to force finalizers to run
java.lang.Runtime.runtime.run_finalization
# Spin for a while, hoping to make this pass
1000.times do
JRuby.runtime.fiber_executor.maximum_pool_size = 1
break if (thread_bean.thread_count - thread_count) < 10
Thread.pass
end
# Final thread count should be within ~10 threads of original (allowing for
# JVM GC, finalizer, reference queue, etc threads to have spun up).
(thread_bean.thread_count - thread_count).should < 10
ensure
JRuby.runtime.fiber_executor.maximum_pool_size = max_threads
end
end
end if RUBY_VERSION >= "1.9"
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