throw new UnknownHostException(name.name);
        }

        /* If a target address to query was not specified explicitly
         * with the addr parameter we fall into this resolveOrder routine.
         */

        for (final int element : resolveOrder) {
            try {
                switch (element) {
                case RESOLVER_LMHOSTS:

		err = errNoSuchGroup
	}
	return err
}

func (ies *IAMEtcdStore) watch(ctx context.Context, keyPath string) <-chan iamWatchEvent {
	ch := make(chan iamWatchEvent)

	// go routine to read events from the etcd watch channel and send them
	// down `ch`
	go func() {
		for {
		outerLoop:
			watchCh := ies.client.Watch(ctx,
				keyPath, etcd.WithPrefix(), etcd.WithKeysOnly())

			for {

				nsMutex:            mutex,
			}
		}(i)
	}

	wg.Wait()

	// start cleanup stale uploads go-routine.
	go s.cleanupStaleUploads(ctx)

	// start cleanup of deleted objects.
	go s.cleanupDeletedObjects(ctx)

	// Start the disk monitoring and connect routine.
	if !globalIsTesting {
		go s.monitorAndConnectEndpoints(ctx, defaultMonitorConnectEndpointInterval)
	}

	return s, nil
}

Nas versões anteriores do NodeJS / Navegador JavaScript, você utilizaria "callbacks". O que leva ao "inferno do callback".

## Corrotinas { #coroutines }

			retryIntvl = 3 * time.Second
		}

		maxRetries := h.config.MaxRetry

	retry:
		// If the channel reaches above half capacity
		// we spawn more workers. The workers spawned
		// from this main worker routine will exit
		// once the channel drops below half capacity
		// and when it's been at least 30 seconds since
		// we launched a new worker.
		if mainWorker && len(h.logCh) > cap(h.logCh)/2 {

        final char[] out = new char[in.length];
        final int length = in.length;
        int prefixLen = 0, state = 0;

        /*
         * The canonicalization routine
         */
        for (int i = 0; i < length; i++) {
            switch (state) {
            case 0:
                if (in[i] != '/') {

            throw new UnknownHostException(name.name);
        }

        /*
         * If a target address to query was not specified explicitly
         * with the addr parameter we fall into this resolveOrder routine.
         */

        for (final ResolverType resolverType : this.resolveOrder) {
            try {
                switch (resolverType) {
                case RESOLVER_LMHOSTS:

// Cancellation/timeouts are removed, so parent cancellations/timeout will
// not propagate from parent.
// Context values are preserved.
// This can be used for goroutines that live beyond the parent context.
func bgContext(parent context.Context) context.Context {
	return bgCtx{parent: parent}
}

type bgCtx struct {
	parent context.Context
}

	cpuSubsystem              MetricSubsystem = "cpu_avg"
	storageClassSubsystem     MetricSubsystem = "storage_class"
	fileDescriptorSubsystem   MetricSubsystem = "file_descriptor"
	goRoutines                MetricSubsystem = "go_routine"
	ioSubsystem               MetricSubsystem = "io"
	nodesSubsystem            MetricSubsystem = "nodes"
	objectsSubsystem          MetricSubsystem = "objects"

                this.state = 6;
                ioe = ioe0;
            }
        case 4: /* failed to connect - reset the transport */
            // thread is cleaned up by connect routine, joining it here causes a deadlock
            this.thread = null;
            this.state = 6;
            break;
        default:
            log.error("Invalid state: " + this.state);