diff --git a/pool.go b/pool.go
index 113027f..25c347e 100644
--- a/pool.go
+++ b/pool.go
@@ -26,7 +26,6 @@ import (
 	"math"
 	"sync"
 	"sync/atomic"
-	"time"
 )
 
 type sig struct{}
@@ -57,8 +56,7 @@ type Pool struct {
 
 	lock sync.Mutex
 
-	// closed is used to confirm whether this pool has been closed.
-	closed int32
+	once sync.Once
 }
 
 // NewPool generates a instance of ants pool
@@ -69,8 +67,7 @@ func NewPool(size int) (*Pool, error) {
 	p := &Pool{
 		capacity:   int32(size),
 		freeSignal: make(chan sig, math.MaxInt32),
-		release:    make(chan sig),
-		closed:     0,
+		release:    make(chan sig, 1),
 	}
 
 	return p, nil
@@ -78,27 +75,9 @@ func NewPool(size int) (*Pool, error) {
 
 //-------------------------------------------------------------------------
 
-// scanAndClean is a goroutine who will periodically clean up
-// after it is noticed that this pool is closed.
-func (p *Pool) scanAndClean() {
-	ticker := time.NewTicker(DefaultCleanIntervalTime * time.Second)
-	go func() {
-		ticker.Stop()
-		for range ticker.C {
-			if atomic.LoadInt32(&p.closed) == 1 {
-				p.lock.Lock()
-				for _, w := range p.workers {
-					w.stop()
-				}
-				p.lock.Unlock()
-			}
-		}
-	}()
-}
-
 // Push submit a task to pool
 func (p *Pool) Push(task f) error {
-	if atomic.LoadInt32(&p.closed) == 1 {
+	if len(p.release) > 0 {
 		return ErrPoolClosed
 	}
 	w := p.getWorker()
@@ -123,10 +102,9 @@ func (p *Pool) Cap() int {
 
 // Release Closed this pool
 func (p *Pool) Release() error {
-	p.lock.Lock()
-	atomic.StoreInt32(&p.closed, 1)
-	close(p.release)
-	p.lock.Unlock()
+	p.once.Do(func() {
+		p.release <- sig{}
+	})
 	return nil
 }
 
diff --git a/worker.go b/worker.go
index 601836c..34b3004 100644
--- a/worker.go
+++ b/worker.go
@@ -43,7 +43,7 @@ func (w *Worker) run() {
 	atomic.AddInt32(&w.pool.running, 1)
 	go func() {
 		for f := range w.task {
-			if f == nil {
+			if f == nil || len(w.pool.release) > 0 {
 				atomic.AddInt32(&w.pool.running, -1)
 				return
 			}