t.Fatal("need update even though just updated")
		}

		// Test transitioning the bucket to enable the GC.

		l.StartGCTransition(true, advance(109*time.Millisecond))
		l.FinishGCTransition(advance(2*time.Millisecond + 1*time.Microsecond))

		if expect := uint64((2*time.Millisecond + 1*time.Microsecond) * procs); l.Fill() != expect {
			t.Fatalf("expected fill of %d, got %d cpu-ns", expect, l.Fill())
		}

		{d: 0, want: "0s"},
		{d: time.Second - time.Millisecond, want: "0s"},
		{d: time.Second, want: "1s"},
		{d: 2*time.Second - time.Millisecond, want: "1s"},
		{d: time.Minute - time.Millisecond, want: "59s"},
		{d: time.Minute, want: "1m"},
		{d: 2*time.Minute - time.Millisecond, want: "1m"},
		{d: time.Hour - time.Millisecond, want: "59m"},
		{d: time.Hour, want: "1h"},

				case <-c:
				}
			}()
		}
		time.Sleep(1 * time.Millisecond)
		release()

		close(c) // let select put its sudog's into the cache
		time.Sleep(1 * time.Millisecond)

		// pick up top sudog
		var cond1 sync.Cond
		var mu1 sync.Mutex
		cond1.L = &mu1
		go func() {
			mu1.Lock()
			cond1.Wait()
			mu1.Unlock()
		}()
		time.Sleep(1 * time.Millisecond)

		// pick up next sudog
		var cond2 sync.Cond

	allocHog(25 * time.Millisecond)

	// checkProcStartStop relies on this.
	var wg2 sync.WaitGroup
	for i := 0; i < runtime.GOMAXPROCS(0); i++ {
		wg2.Add(1)
		go func() {
			defer wg2.Done()
			cpuHog(50 * time.Millisecond)
		}()
	}
	wg2.Wait()

	// checkSyscalls relies on this.
	done := make(chan error)
	go blockingSyscall(50*time.Millisecond, done)
	if err := <-done; err != nil {

	c := &callbackRecorder{callbacks: 0}
	ttl := NewTTLWithCallback(50*time.Millisecond, time.Millisecond, c.callback)
	testCacheEvicter(ttl)
	if atomic.LoadInt64(&c.callbacks) != 1 {
		t.Errorf("evictExpired() => failed to invoke EvictionCallback: got %d callbacks, wanted 1", c.callbacks)
	}
}

func TestTTLFinalizer(t *testing.T) {
	ttl := NewTTL(5*time.Second, 1*time.Millisecond).(*ttlWrapper)
	testCacheFinalizer(&ttl.evicterTerminated)
}

		defer close(done)
		t2 = time.Now()
		return nil
	}, 200*time.Millisecond)
	dq.PushDelayed(func() error {
		mu.Lock()
		defer mu.Unlock()
		t1 = time.Now()
		return nil
	}, 100*time.Millisecond)
	dq.Push(func() error {
		mu.Lock()
		defer mu.Unlock()
		t0 = time.Now()
		return nil
	})

	select {
	case <-time.After(500 * time.Millisecond):
	case <-done:
	}

	mu.Lock()

	go func() {
		for {
			runtime.GC()
			time.Sleep(1 * time.Millisecond)
		}
	}()

	// Start tracing.
	if err := trace.Start(os.Stdout); err != nil {
		log.Fatalf("failed to start tracing: %v", err)
	}
	// Run GOMAXPROCS a bunch of times, up and down.
	for i := 1; i <= 16; i *= 2 {
		runtime.GOMAXPROCS(i)
		time.Sleep(1 * time.Millisecond)
	}
	for i := 16; i >= 1; i /= 2 {
		runtime.GOMAXPROCS(i)

	sub("t1", "t2", t1, t1w, t2, t2w, -10*Millisecond, 990*Millisecond)
	sub("t1", "t3", t1, t1w, t3, t3w, -1000*Millisecond, 0)

	sub("t2", "t1", t2, t2w, t1, t1w, 10*Millisecond, -990*Millisecond)
	sub("t2", "t2", t2, t2w, t2, t2w, 0, 0)
	sub("t2", "t3", t2, t2w, t3, t3w, -990*Millisecond, -990*Millisecond)

	sub("t3", "t1", t3, t3w, t1, t1w, 1000*Millisecond, 0)

	}()
	<-c
	runtime.GC()
	time.Sleep(100 * time.Millisecond)
	finVar.Lock()
	finVar.cnt++
	finVar.Unlock()
}

func TestRaceFin(t *testing.T) {
	c := make(chan bool)
	y := 0
	_ = y
	go func() {
		x := new(string)
		runtime.SetFinalizer(x, func(x *string) {
			y = 42
		})
		c <- true
	}()
	<-c
	runtime.GC()
	time.Sleep(100 * time.Millisecond)
	y = 66

		{"d: 5s\n", Duration{5 * time.Second}},
		{"d: 2m0s\n", Duration{2 * time.Minute}},
		{"d: 1h0m0.003s\n", Duration{time.Hour + 3*time.Millisecond}},

		// Units with zero values can optionally be dropped
		{"d: 2m\n", Duration{2 * time.Minute}},
		{"d: 1h0.003s\n", Duration{time.Hour + 3*time.Millisecond}},
	}

	for _, c := range cases {
		var result DurationHolder
		if err := yaml.Unmarshal([]byte(c.input), &result); err != nil {