// on systems with coarse timer granularity.
	const blockTime = 100 * time.Millisecond

	// Make sure the goroutine spawned above actually blocks on the lock.
	for {
		if runtime.GIsWaitingOnMutex(gp) {
			break
		}
		runtime.Gosched()
	}

	// Let some amount of time pass.
	time.Sleep(blockTime)

	// Let the other goroutine acquire the lock.
	mu.Unlock1()
	done <- true

	return mheap_.arenaHints.addr
}

type G = g

type Sudog = sudog

func Getg() *G {
	return getg()
}

func Goid() uint64 {
	return getg().goid
}

func GIsWaitingOnMutex(gp *G) bool {
	return readgstatus(gp) == _Gwaiting && gp.waitreason.isMutexWait()
}

var CasGStatusAlwaysTrack = &casgstatusAlwaysTrack

//go:noinline
func PanicForTesting(b []byte, i int) byte {