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# frozen_string_literal: false
require 'envutil'
class TestThreadInstrumentation < Test::Unit::TestCase
def setup
pend("No windows support") if /mswin|mingw|bccwin/ =~ RUBY_PLATFORM
require '-test-/thread/instrumentation'
Bug::ThreadInstrumentation.reset_counters
Bug::ThreadInstrumentation::register_callback
end
def teardown
return if /mswin|mingw|bccwin/ =~ RUBY_PLATFORM
Bug::ThreadInstrumentation::unregister_callback
end
THREADS_COUNT = 3
def test_thread_instrumentation
threads = threaded_cpu_work
assert_equal [false] * THREADS_COUNT, threads.map(&:status)
counters = Bug::ThreadInstrumentation.counters
counters.each do |c|
assert_predicate c, :nonzero?, "Call counters: #{counters.inspect}"
end
assert_equal THREADS_COUNT, counters.first
assert_in_delta THREADS_COUNT, counters.last, 1 # It's possible that a thread didn't execute its EXIT hook yet.
end
def test_join_counters # Bug #18900
thr = Thread.new { fib(30) }
Bug::ThreadInstrumentation.reset_counters
thr.join
assert_equal [1, 1, 1], Bug::ThreadInstrumentation.local_counters
end
def test_thread_instrumentation_fork_safe
skip "No fork()" unless Process.respond_to?(:fork)
read_pipe, write_pipe = IO.pipe
pid = fork do
Bug::ThreadInstrumentation.reset_counters
threads = threaded_cpu_work
write_pipe.write(Marshal.dump(threads.map(&:status)))
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?
thread_statuses = Marshal.load(read_pipe)
assert_equal [false] * THREADS_COUNT, thread_statuses
counters = Marshal.load(read_pipe)
read_pipe.close
counters.each do |c|
assert_predicate c, :nonzero?, "Call counters: #{counters.inspect}"
end
assert_equal THREADS_COUNT, counters.first
assert_in_delta THREADS_COUNT, counters.last, 1 # It's possible that a thread didn't execute its EXIT hook yet.
end
def test_thread_instrumentation_unregister
Bug::ThreadInstrumentation::unregister_callback
assert Bug::ThreadInstrumentation::register_and_unregister_callbacks
end
private
def fib(n = 20)
return n if n <= 1
fib(n-1) + fib(n-2)
end
def threaded_cpu_work(size = 20)
THREADS_COUNT.times.map { Thread.new { fib(size) } }.each(&:join)
end
end
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