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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'
Thread.list.each do |thread|
if thread != Thread.current
thread.kill
thread.join rescue nil
end
end
assert_equal [Thread.current], Thread.list
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
assert_join_counters(counters)
assert_global_join_counters(counters)
end
def test_join_counters # Bug #18900
thr = Thread.new { fib(30) }
Bug::ThreadInstrumentation.reset_counters
thr.join
assert_join_counters(Bug::ThreadInstrumentation.local_counters)
end
def test_thread_instrumentation_fork_safe
skip "No fork()" unless Process.respond_to?(:fork)
thread_statuses = counters = nil
IO.popen("-") do |read_pipe|
if read_pipe
thread_statuses = Marshal.load(read_pipe)
counters = Marshal.load(read_pipe)
else
Bug::ThreadInstrumentation.reset_counters
threads = threaded_cpu_work
Marshal.dump(threads.map(&:status), STDOUT)
Marshal.dump(Bug::ThreadInstrumentation.counters, STDOUT)
end
end
assert_predicate $?, :success?
assert_equal [false] * THREADS_COUNT, thread_statuses
assert_join_counters(counters)
assert_global_join_counters(counters)
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
def assert_join_counters(counters)
counters.each_with_index do |c, i|
assert_operator c, :>, 0, "Call counters[#{i}]: #{counters.inspect}"
end
end
def assert_global_join_counters(counters)
assert_equal THREADS_COUNT, counters.first
end
end
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