//
//go:systemstack
func stackalloc(n uint32) stack {
	// Stackalloc must be called on scheduler stack, so that we
	// never try to grow the stack during the code that stackalloc runs.
	// Doing so would cause a deadlock (issue 1547).
	thisg := getg()
	if thisg != thisg.m.g0 {
		throw("stackalloc not on scheduler stack")
	}
	if n&(n-1) != 0 {
		throw("stack size not a power of 2")
	}
	if stackDebug >= 1 {

	// lock protects all fields in hchan, as well as several
	// fields in sudogs blocked on this channel.
	//
	// Do not change another G's status while holding this lock
	// (in particular, do not ready a G), as this can deadlock
	// with stack shrinking.
	lock mutex
}

type waitq struct {
	first *sudog
	last  *sudog
}

//go:linkname reflect_makechan reflect.makechan
func reflect_makechan(t *chantype, size int) *hchan {

	// will exit before the parallel children are executed. It should be noted that if the parent test is prevented
	// from exiting (e.g. parent test is waiting for something to occur within the child test), the test will
	// deadlock.
	//
	// Example:
	//
	// func TestParallel(t *testing.T) {
	//     framework.NewTest(t).
	//         Run(func(ctx framework.TestContext) {
	//             ctx.NewSubTest("T1").

	39:  "level 3 halted",
	40:  "level 3 reset",
	41:  "link number out of range",
	42:  "protocol driver not attached",
	43:  "no CSI structure available",
	44:  "level 2 halted",
	45:  "deadlock situation detected/avoided",
	46:  "no record locks available",
	47:  "operation canceled",
	48:  "operation not supported",
	49:  "disc quota exceeded",
	50:  "bad exchange descriptor",

	// also no stale generation values left. Therefore, it's safe to flush
	// any buffers that remain in that generation's slot.
	const debugDeadlock = false
	systemstack(func() {
		// Track iterations for some rudimentary deadlock detection.
		i := 0
		detectedDeadlock := false

		for mToFlush != nil {
			prev := &mToFlush
			for mp := *prev; mp != nil; {
				if mp.trace.seqlock.Load()%2 != 0 {

		}

	case *Named:
		// subst is called during expansion, so in this function we need to be
		// careful not to call any methods that would cause t to be expanded: doing
		// so would result in deadlock.
		//
		// So we call t.Origin().TypeParams() rather than t.TypeParams().
		orig := t.Origin()
		n := orig.TypeParams().Len()
		if n == 0 {
			return t // type is not parameterized
		}

		}

	case *Named:
		// subst is called during expansion, so in this function we need to be
		// careful not to call any methods that would cause t to be expanded: doing
		// so would result in deadlock.
		//
		// So we call t.Origin().TypeParams() rather than t.TypeParams().
		orig := t.Origin()
		n := orig.TypeParams().Len()
		if n == 0 {
			return t // type is not parameterized
		}

            blockingServer.expect(":cInvalidPing")
            run ":aPing", ":bPing", ":cInvalidPing"
        }
    }

    @Issue("https://github.com/gradle/gradle/issues/17013")
    def "does not deadlock when resolving outputs requires resolving multiple artifacts"() {
        buildFile("""
            import org.gradle.util.internal.GFileUtils

            abstract class OutputDeadlockTask extends DefaultTask {

	// from the SchedulingQueue.
	// If there are no new pods to schedule, it will be hanging there
	// and if done in this goroutine it will be blocking closing
	// SchedulingQueue, in effect causing a deadlock on shutdown.
	go wait.UntilWithContext(ctx, sched.ScheduleOne, 0)

	<-ctx.Done()
	sched.SchedulingQueue.Close()

	// If the plugins satisfy the io.Closer interface, they are closed.

// Issue 21874
func TestTickerStopWithDirectInitialization(t *testing.T) {
	c := make(chan Time)
	tk := &Ticker{C: c}
	tk.Stop()
}

// Test that a bug tearing down a ticker has been fixed. This routine should not deadlock.
func TestTeardown(t *testing.T) {
	t.Parallel()

	Delta := 100 * Millisecond
	if testing.Short() {
		Delta = 20 * Millisecond
	}
	for range 3 {
		ticker := NewTicker(Delta)
		<-ticker.C