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# frozen_string_literal: true
require 'test/unit'
require_relative 'scheduler'
class TestFiberMutex < Test::Unit::TestCase
def test_mutex_synchronize
mutex = Mutex.new
thread = Thread.new do
scheduler = Scheduler.new
Thread.current.scheduler = scheduler
Fiber.schedule do
assert_equal Thread.scheduler, scheduler
mutex.synchronize do
assert Thread.scheduler
end
end
end
thread.join
end
def test_mutex_interleaved_locking
mutex = Mutex.new
thread = Thread.new do
scheduler = Scheduler.new
Thread.current.scheduler = scheduler
Fiber.schedule do
mutex.lock
sleep 0.1
mutex.unlock
end
Fiber.schedule do
mutex.lock
sleep 0.1
mutex.unlock
end
scheduler.run
end
thread.join
end
def test_condition_variable
mutex = Mutex.new
condition = ConditionVariable.new
signalled = 0
thread = Thread.new do
scheduler = Scheduler.new
Thread.current.scheduler = scheduler
Fiber.schedule do
mutex.synchronize do
3.times do
condition.wait(mutex)
signalled += 1
end
end
end
Fiber.schedule do
3.times do
mutex.synchronize do
condition.signal
end
sleep 0.1
end
end
scheduler.run
end
thread.join
assert signalled > 1
end
def test_mutex_deadlock
err = /No live threads left. Deadlock\?/
assert_in_out_err %W[-I#{__dir__} -], <<-RUBY, ['in synchronize'], err, success: false
require 'scheduler'
mutex = Mutex.new
thread = Thread.new do
scheduler = Scheduler.new
Thread.current.scheduler = scheduler
Fiber.schedule do
raise unless Thread.scheduler == scheduler
mutex.synchronize do
puts 'in synchronize'
Fiber.yield
end
end
mutex.lock
end
thread.join
RUBY
end
end
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