require 'test/unit' require 'thread' require 'tmpdir' require_relative '../ruby/envutil' class TestConditionVariable < Test::Unit::TestCase def test_condvar_signal_and_wait mutex = Mutex.new condvar = ConditionVariable.new result = [] mutex.synchronize do t = Thread.new do mutex.synchronize do result << 1 condvar.signal end end result << 0 condvar.wait(mutex) result << 2 t.join end assert_equal([0, 1, 2], result) end def test_condvar_wait_exception_handling # Calling wait in the only thread running should raise a ThreadError of # 'stopping only thread' mutex = Mutex.new condvar = ConditionVariable.new locked = false thread = Thread.new do Thread.current.abort_on_exception = false mutex.synchronize do begin condvar.wait(mutex) rescue Exception locked = mutex.locked? raise end end end until thread.stop? sleep(0.1) end thread.raise Interrupt, "interrupt a dead condition variable" assert_raise(Interrupt) { thread.value } assert(locked) end def test_condvar_wait_and_broadcast nr_threads = 3 threads = Array.new mutex = Mutex.new condvar = ConditionVariable.new result = [] nr_threads.times do |i| threads[i] = Thread.new do mutex.synchronize do result << "C1" condvar.wait mutex result << "C2" end end end sleep 0.1 mutex.synchronize do result << "P1" condvar.broadcast result << "P2" end nr_threads.times do |i| threads[i].join end assert_equal ["C1", "C1", "C1", "P1", "P2", "C2", "C2", "C2"], result end def test_condvar_wait_deadlock assert_in_out_err([], <<-INPUT, ["No live threads left. Deadlock?"], []) require "thread" mutex = Mutex.new cv = ConditionVariable.new mesg = nil begin mutex.lock cv.wait mutex mutex.unlock rescue Exception => e mesg = e.message end print mesg INPUT end def test_condvar_wait_deadlock_2 nr_threads = 3 threads = Array.new mutex = Mutex.new condvar = ConditionVariable.new nr_threads.times do |i| if (i != 0) mutex.unlock end threads[i] = Thread.new do mutex.synchronize do condvar.wait mutex end end mutex.lock end assert_raise(Timeout::Error) do Timeout.timeout(0.1) { condvar.wait mutex } end mutex.unlock threads.each(&:kill) threads.each(&:join) end def test_condvar_timed_wait mutex = Mutex.new condvar = ConditionVariable.new timeout = 0.3 locked = false t0 = Time.now mutex.synchronize do begin condvar.wait(mutex, timeout) ensure locked = mutex.locked? end end t1 = Time.now t = t1-t0 assert_operator(timeout*0.9, :<, t) assert(locked) end def test_condvar_nolock mutex = Mutex.new condvar = ConditionVariable.new assert_raise(ThreadError) {condvar.wait(mutex)} end def test_condvar_nolock_2 mutex = Mutex.new condvar = ConditionVariable.new Thread.new do assert_raise(ThreadError) {condvar.wait(mutex)} end.join end def test_condvar_nolock_3 mutex = Mutex.new condvar = ConditionVariable.new Thread.new do assert_raise(ThreadError) {condvar.wait(mutex, 0.1)} end.join end def test_condvar_empty_signal mutex = Mutex.new condvar = ConditionVariable.new assert_nothing_raised(Exception) { mutex.synchronize {condvar.signal} } end def test_condvar_empty_broadcast mutex = Mutex.new condvar = ConditionVariable.new assert_nothing_raised(Exception) { mutex.synchronize {condvar.broadcast} } end end