// and orthogonal to syscallEnd; both must be called if the syscall blocked. This sets up an instant
// to emit a flow event from, indicating explicitly that this goroutine was unblocked by the system.
func (gs *gState[R]) blockedSyscallEnd(ts trace.Time, stack trace.Stack, ctx *traceContext) {
	name := "exit blocked syscall"
	gs.setStartCause(ts, name, trace.SyscallP, stack)

		// is safe.
		if ii.combinesBackward() {
			cccB := b[k-1].ccc
			cccC := ii.ccc
			blocked := false // b[i] blocked by starter or greater or equal CCC?
			if cccB == 0 {
				s = k - 1
			} else {
				blocked = s != k-1 && cccB >= cccC
			}
			if !blocked {
				combined := combine(rb.runeAt(s), rb.runeAt(i))
				if combined != 0 {
					rb.assignRune(s, combined)
					continue

		// is safe.
		if ii.combinesBackward() {
			cccB := b[k-1].ccc
			cccC := ii.ccc
			blocked := false // b[i] blocked by starter or greater or equal CCC?
			if cccB == 0 {
				s = k - 1
			} else {
				blocked = s != k-1 && cccB >= cccC
			}
			if !blocked {
				combined := combine(rb.runeAt(s), rb.runeAt(i))
				if combined != 0 {
					rb.assignRune(s, combined)
					continue

	// Check that remote is canceled.
	<-serverCanceled
	close(nowBlocking)
}

// testServerStreamPingRunning will test if server and client handle ping even when blocked.
func testServerStreamPingRunning(t *testing.T, local, remote *Manager, inCap int, blockResp, blockReq bool) {
	defer testlogger.T.SetErrorTB(t)()
	errFatal := func(err error) {
		t.Helper()
		if err != nil {
			t.Fatal(err)
		}
	}

listed in /etc/resolv.conf, or it can use a cgo-based resolver that calls C
library routines such as getaddrinfo and getnameinfo.

On Unix the pure Go resolver is preferred over the cgo resolver, because a blocked DNS
request consumes only a goroutine, while a blocked C call consumes an operating system thread.
When cgo is available, the cgo-based resolver is used instead under a variety of
conditions: on systems that do not let programs make direct DNS requests (OS X),

	pd := pollcache.alloc()
	lock(&pd.lock)
	wg := pd.wg.Load()
	if wg != pdNil && wg != pdReady {
		throw("runtime: blocked write on free polldesc")
	}
	rg := pd.rg.Load()
	if rg != pdNil && rg != pdReady {
		throw("runtime: blocked read on free polldesc")
	}
	pd.fd = fd
	if pd.fdseq.Load() == 0 {
		// The value 0 is special in setEventErr, so don't use it.
		pd.fdseq.Store(1)
	}

	// May sure that the watch will not be blocked on Stop.
	for i := 0; i < maxRetriesToProduceTheRaceCondition; i++ {
		w = newCacheWatcher(0, filter, forget, storage.APIObjectVersioner{}, time.Now(), false, schema.GroupResource{Resource: "pods"}, "")
		go w.Stop()
		select {
		case <-done:
		case <-time.After(time.Second):
			t.Fatal("stop is blocked when the timer is fired concurrently")
		}
	}

	if !t.isChan || t.blocked == 0 {
		badTimer()
	}
	t.blocked--
	if t.blocked == 0 && t.state&timerHeaped != 0 && t.state&timerZombie == 0 {
		// Last goroutine that was blocked on this timer.
		// Mark for removal from heap but do not clear t.when,
		// so that we know what time it is still meant to trigger.
		t.state |= timerZombie
		t.ts.zombies.Add(1)
	}
	t.unlock()

                setState(State.Blocking, State.Blocked);
                waitForState(State.Unblocked, State.Failed);
            } catch (InterruptedException e) {
                throw UncheckedException.throwAsUncheckedException(e);
            }
        }

        public void expectUnblocks(Closure action) {
            try {
                waitForState(State.Blocked);

  private static final long SMALL_TIMEOUT_MILLIS = 10;

  /** How long to wait when determining that a thread is blocked if we expect it to be blocked. */
  private static final long EXPECTED_HANG_DELAY_MILLIS = 75;

  /**
   * How long to wait when determining that a thread is blocked if we DON'T expect it to be blocked.
   */
  private static final long UNEXPECTED_HANG_DELAY_MILLIS = 10000;

  /**