send := func(result acceptResult) bool {
		select {
		case listener.acceptCh <- result:
			// Successfully written to acceptCh
			return true
		case <-listener.ctx.Done():
			return false
		}
	}

	// Closure to handle TCPListener until done channel is closed.
	handleListener := func(idx int, listener net.Listener) {
		for {
			conn, err := listener.Accept()
			send(acceptResult{conn, err, idx})
		}
	}

	}
	go func() {
		<-p.ctx.Done()
		for i := 0; i < LargeWorkerCount; i++ {
			xioutil.SafeClose(p.lrgworkers[i])
		}
	}()
}

// AddLargeWorker adds a replication worker to the static pool for large uploads.
func (p *ReplicationPool) AddLargeWorker(input <-chan ReplicationWorkerOperation) {
	for {
		select {
		case <-p.ctx.Done():
			return
		case oi, ok := <-input:

}

func (wg *WaitGroup) Add(i int32) {
	select {
	case <-wg.done:
		panic("use of an already closed WaitGroup")
	default:
	}
	atomic.AddInt32(&wg.count, i)
}

func (wg *WaitGroup) Done() {
	i := atomic.AddInt32(&wg.count, -1)
	if i == 0 {
		close(wg.done)
	}
}

func (wg *WaitGroup) C() <-chan struct{} {
	return wg.done

// PipeWriter is similar to io.PipeWriter with wait group
type PipeWriter struct {
	*io.PipeWriter
	once sync.Once
	done func()
}

// CloseWithError close with supplied error the writer end.
func (w *PipeWriter) CloseWithError(err error) error {
	err = w.PipeWriter.CloseWithError(err)
	w.once.Do(func() {
		w.done()
	})
	return err
}

// PipeReader is similar to io.PipeReader with wait group
type PipeReader struct {

				xfer := make([]expireObjInfo, len(toDel))
				copy(xfer, toDel)

				var done bool
				select {
				case <-ctx.Done():
					done = true
				case expireCh <- xfer:
					toDel = toDel[:0] // resetting toDel
				}
				if done {
					break
				}
			}
			var match BatchJobExpireFilter
			var found bool
			for _, rule := range r.Rules {

	}

	if DB.Where("code = ?", "dont_update").First(&Product{}).Error == nil {
		t.Fatalf("Record Should not be updated due to errors happened in before update callback")
	}

	p2.Code = "dont_save"
	if DB.Save(&p2).Error == nil {
		t.Fatalf("An error from before save callbacks happened when update with invalid value")
	}

	p3 := Product{Code: "dont_delete", Price: 100}
	DB.Save(&p3)

// Listen - listen on peers.
func (client *peerRESTClient) Listen(ctx context.Context, listenCh chan<- []byte, v url.Values) {
	go func() {
		for {
			client.doListen(ctx, listenCh, v)
			select {
			case <-ctx.Done():
				return
			default:
				// There was error in the REST request, retry after sometime as probably the peer is down.
				time.Sleep(5 * time.Second)
			}
		}
	}()
}

		// fmt.Println("Unlocking dm1")

		dm1st.Unlock(context.Background())
	}()
	expect += 2 * testDrwMutexAcquireTimeout

	var wg sync.WaitGroup
	wg.Add(2)

	go func() {
		defer wg.Done()

		dm2nd.Lock(id, source)

		// Release lock after 10 seconds
		go func() {
			time.Sleep(2 * testDrwMutexAcquireTimeout)
			// fmt.Println("Unlocking dm2")

			dm2nd.Unlock(context.Background())

func (sys *BucketQuotaSys) Init(objAPI ObjectLayer) {
	bucketStorageCache.InitOnce(10*time.Second,
		cachevalue.Opts{ReturnLastGood: true, NoWait: true},
		func() (DataUsageInfo, error) {
			ctx, done := context.WithTimeout(context.Background(), 2*time.Second)
			defer done()

			return loadDataUsageFromBackend(ctx, objAPI)
		},
	)
}

// GetBucketUsageInfo return bucket usage info for a given bucket

			select {
			// Check after a second
			case <-time.After(time.Second):
				h.mutex.Unlock()
				continue

			case <-h.ctx.Done():
				h.mutex.Unlock()
				// discard result and return.
				return errHealStopSignalled

			// Timeout if no results consumed for too long.
			case <-unconsumedTimer.C:
				h.mutex.Unlock()
				return errHealIdleTimeout
			}
		}
		break
	}