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Refactor TestThreadInstrumentation to investigate CI flakiness

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`test_thread_instrumentation_fork_safe` has been failing occasionaly
on Ubuntu and Arch. At this stage we're not sure why, all we know is
that the child exit with status 1.

I suspect that something entirely unrelated cause the forked children
to fail on exit, so by using `exit!(0)` and doing assertions in the
parent I hope to be resilient to that.
This commit is contained in:
Jean Boussier 2022-06-07 10:51:28 +02:00
parent f075be3dcb
commit b1e6e58cd1
Notes: git 2022-06-07 20:20:05 +09:00 
Merged: https://github.com/ruby/ruby/pull/5983
1 changed files with 24 additions and 10 deletions
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34
test/-ext-/thread/test_instrumentation_api.rb
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@ -10,10 +10,10 @@ class TestThreadInstrumentation < Test::Unit::TestCase
Bug::ThreadInstrumentation::register_callback
begin
threads = 5.times.map { Thread.new { sleep 0.5; 1 + 1; sleep 0.2 } }
threads.each(&:join)
Bug::ThreadInstrumentation.counters.each do |c|
assert_predicate c,:nonzero?
threaded_cpu_work
counters = Bug::ThreadInstrumentation.counters
counters.each do |c|
assert_predicate c,:nonzero?, "Call counters: #{counters.inspect}"
end
ensure
Bug::ThreadInstrumentation::unregister_callback
@ -26,17 +26,26 @@ class TestThreadInstrumentation < Test::Unit::TestCase
require '-test-/thread/instrumentation'
Bug::ThreadInstrumentation::register_callback
read_pipe, write_pipe = IO.pipe
begin
pid = fork do
Bug::ThreadInstrumentation.reset_counters
threads = 5.times.map { Thread.new { sleep 0.5; 1 + 1; sleep 0.2 } }
threads.each(&:join)
Bug::ThreadInstrumentation.counters.each do |c|
assert_predicate c,:nonzero?
end
threaded_cpu_work
write_pipe.write(Marshal.dump(Bug::ThreadInstrumentation.counters))
write_pipe.close
exit!(0)
end
write_pipe.close
_, status = Process.wait2(pid)
assert_predicate status, :success?
counters = Marshal.load(read_pipe)
read_pipe.close
counters.each do |c|
assert_predicate c,:nonzero?, "Call counters: #{counters.inspect}"
end
ensure
Bug::ThreadInstrumentation::unregister_callback
end
@ -46,5 +55,10 @@ class TestThreadInstrumentation < Test::Unit::TestCase
require '-test-/thread/instrumentation'
assert Bug::ThreadInstrumentation::register_and_unregister_callbacks
end
end
private
def threaded_cpu_work
5.times.map { Thread.new { 100.times { |i| i + i } } }.each(&:join)
end
end