diff --git a/acceptor_unix.go b/acceptor_unix.go
index 8a9d03178..70182b06b 100644
--- a/acceptor_unix.go
+++ b/acceptor_unix.go
@@ -25,9 +25,10 @@ package gnet
 import (
 	"os"
 
+	"golang.org/x/sys/unix"
+
 	"github.com/panjf2000/gnet/errors"
 	"github.com/panjf2000/gnet/internal/socket"
-	"golang.org/x/sys/unix"
 )
 
 func (svr *server) acceptNewConnection(fd int) error {
@@ -47,16 +48,7 @@ func (svr *server) acceptNewConnection(fd int) error {
 	el := svr.lb.next(netAddr)
 	c := newTCPConn(nfd, el, sa, netAddr)
 
-	err = el.poller.UrgentTrigger(func(_ []byte) (err error) {
-		if err = el.poller.AddRead(nfd); err != nil {
-			_ = unix.Close(nfd)
-			c.releaseTCP()
-			return
-		}
-		el.connections[nfd] = c
-		err = el.loopOpen(c)
-		return
-	})
+	err = el.poller.UrgentTrigger(el.loopInsert, c)
 	if err != nil {
 		_ = unix.Close(nfd)
 		c.releaseTCP()
diff --git a/connection_unix.go b/connection_unix.go
index c4b9f0e72..9d0e05ac9 100644
--- a/connection_unix.go
+++ b/connection_unix.go
@@ -110,9 +110,6 @@ func (c *conn) read() ([]byte, error) {
 }
 
 func (c *conn) write(buf []byte) (err error) {
-	if !c.opened {
-		return
-	}
 	var outFrame []byte
 	if outFrame, err = c.codec.Encode(c, buf); err != nil {
 		return
@@ -142,6 +139,13 @@ func (c *conn) write(buf []byte) (err error) {
 	return
 }
 
+func (c *conn) asyncWrite(itf interface{}) error {
+	if !c.opened {
+		return nil
+	}
+	return c.write(itf.([]byte))
+}
+
 func (c *conn) sendTo(buf []byte) error {
 	return unix.Sendto(c.fd, buf, 0, c.sa)
 }
@@ -222,7 +226,7 @@ func (c *conn) BufferLength() int {
 }
 
 func (c *conn) AsyncWrite(buf []byte) error {
-	return c.loop.poller.Trigger(c.write, buf)
+	return c.loop.poller.Trigger(c.asyncWrite, buf)
 }
 
 func (c *conn) SendTo(buf []byte) error {
@@ -230,15 +234,11 @@ func (c *conn) SendTo(buf []byte) error {
 }
 
 func (c *conn) Wake() error {
-	return c.loop.poller.UrgentTrigger(func(_ []byte) error {
-		return c.loop.loopWake(c)
-	})
+	return c.loop.poller.UrgentTrigger(func(_ interface{}) error { return c.loop.loopWake(c) }, nil)
 }
 
 func (c *conn) Close() error {
-	return c.loop.poller.Trigger(func(_ []byte) error {
-		return c.loop.loopCloseConn(c, nil)
-	}, nil)
+	return c.loop.poller.Trigger(func(_ interface{}) error { return c.loop.loopCloseConn(c, nil) }, nil)
 }
 
 func (c *conn) Context() interface{}       { return c.ctx }
diff --git a/eventloop_unix.go b/eventloop_unix.go
index e1898188c..dc404877d 100644
--- a/eventloop_unix.go
+++ b/eventloop_unix.go
@@ -126,6 +126,17 @@ func (el *eventloop) loopAccept(fd int) error {
 	return nil
 }
 
+func (el *eventloop) loopInsert(itf interface{}) error {
+	c := itf.(*conn)
+	if err := el.poller.AddRead(c.fd); err != nil {
+		_ = unix.Close(c.fd)
+		c.releaseTCP()
+		return nil
+	}
+	el.connections[c.fd] = c
+	return el.loopOpen(c)
+}
+
 func (el *eventloop) loopOpen(c *conn) error {
 	c.opened = true
 	el.addConn(1)
@@ -281,7 +292,7 @@ func (el *eventloop) loopTicker(ctx context.Context) {
 		switch action {
 		case None:
 		case Shutdown:
-			err := el.poller.UrgentTrigger(func(_ []byte) error { return gerrors.ErrServerShutdown })
+			err := el.poller.UrgentTrigger(func(_ interface{}) error { return gerrors.ErrServerShutdown }, nil)
 			el.getLogger().Debugf("stopping ticker in event-loop(%d) from Tick(), UrgentTrigger:%v", el.idx, err)
 		}
 		if timer == nil {
diff --git a/internal/netpoll/epoll.go b/internal/netpoll/epoll.go
index 7da335b7e..0ade7b3d1 100644
--- a/internal/netpoll/epoll.go
+++ b/internal/netpoll/epoll.go
@@ -91,9 +91,9 @@ var (
 //
 // Note that priorAsyncTaskQueue is a queue with high-priority and its size is expected to be small,
 // so only those urgent tasks should be put into this queue.
-func (p *Poller) UrgentTrigger(f queue.TaskFunc) (err error) {
+func (p *Poller) UrgentTrigger(fn queue.TaskFunc, arg interface{}) (err error) {
 	task := queue.GetTask()
-	task.Run = f
+	task.Run, task.Arg = fn, arg
 	p.priorAsyncTaskQueue.Enqueue(task)
 	if atomic.CompareAndSwapInt32(&p.netpollWakeSig, 0, 1) {
 		for _, err = unix.Write(p.wfd, b); err == unix.EINTR || err == unix.EAGAIN; _, err = unix.Write(p.wfd, b) {
@@ -106,9 +106,9 @@ func (p *Poller) UrgentTrigger(f queue.TaskFunc) (err error) {
 // call this method when the task is not so urgent, for instance writing data back to client.
 //
 // Note that asyncTaskQueue is a queue with low-priority whose size may grow large and tasks in it may backlog.
-func (p *Poller) Trigger(f queue.TaskFunc, buf []byte) (err error) {
+func (p *Poller) Trigger(fn queue.TaskFunc, arg interface{}) (err error) {
 	task := queue.GetTask()
-	task.Run, task.Buf = f, buf
+	task.Run, task.Arg = fn, arg
 	p.asyncTaskQueue.Enqueue(task)
 	if atomic.CompareAndSwapInt32(&p.netpollWakeSig, 0, 1) {
 		for _, err = unix.Write(p.wfd, b); err == unix.EINTR || err == unix.EAGAIN; _, err = unix.Write(p.wfd, b) {
@@ -154,7 +154,7 @@ func (p *Poller) Polling(callback func(fd int, ev uint32) error) error {
 			wakenUp = false
 			task := p.priorAsyncTaskQueue.Dequeue()
 			for ; task != nil; task = p.priorAsyncTaskQueue.Dequeue() {
-				switch err = task.Run(task.Buf); err {
+				switch err = task.Run(task.Arg); err {
 				case nil:
 				case errors.ErrServerShutdown:
 					return err
@@ -167,7 +167,7 @@ func (p *Poller) Polling(callback func(fd int, ev uint32) error) error {
 				if task = p.asyncTaskQueue.Dequeue(); task == nil {
 					break
 				}
-				switch err = task.Run(task.Buf); err {
+				switch err = task.Run(task.Arg); err {
 				case nil:
 				case errors.ErrServerShutdown:
 					return err
diff --git a/internal/netpoll/kqueue.go b/internal/netpoll/kqueue.go
index 7bc44c760..b2f23d09c 100644
--- a/internal/netpoll/kqueue.go
+++ b/internal/netpoll/kqueue.go
@@ -82,9 +82,9 @@ var wakeChanges = []unix.Kevent_t{{
 //
 // Note that priorAsyncTaskQueue is a queue with high-priority and its size is expected to be small,
 // so only those urgent tasks should be put into this queue.
-func (p *Poller) UrgentTrigger(f queue.TaskFunc) (err error) {
+func (p *Poller) UrgentTrigger(fn queue.TaskFunc, arg interface{}) (err error) {
 	task := queue.GetTask()
-	task.Run = f
+	task.Run, task.Arg = fn, arg
 	p.priorAsyncTaskQueue.Enqueue(task)
 	if atomic.CompareAndSwapInt32(&p.netpollWakeSig, 0, 1) {
 		for _, err = unix.Kevent(p.fd, wakeChanges, nil, nil); err == unix.EINTR || err == unix.EAGAIN; _, err = unix.Kevent(p.fd, wakeChanges, nil, nil) {
@@ -97,9 +97,9 @@ func (p *Poller) UrgentTrigger(f queue.TaskFunc) (err error) {
 // call this method when the task is not so urgent, for instance writing data back to client.
 //
 // Note that asyncTaskQueue is a queue with low-priority whose size may grow large and tasks in it may backlog.
-func (p *Poller) Trigger(f queue.TaskFunc, buf []byte) (err error) {
+func (p *Poller) Trigger(fn queue.TaskFunc, arg interface{}) (err error) {
 	task := queue.GetTask()
-	task.Run, task.Buf = f, buf
+	task.Run, task.Arg = fn, arg
 	p.asyncTaskQueue.Enqueue(task)
 	if atomic.CompareAndSwapInt32(&p.netpollWakeSig, 0, 1) {
 		for _, err = unix.Kevent(p.fd, wakeChanges, nil, nil); err == unix.EINTR || err == unix.EAGAIN; _, err = unix.Kevent(p.fd, wakeChanges, nil, nil) {
@@ -152,7 +152,7 @@ func (p *Poller) Polling(callback func(fd int, filter int16) error) error {
 			wakenUp = false
 			task := p.priorAsyncTaskQueue.Dequeue()
 			for ; task != nil; task = p.priorAsyncTaskQueue.Dequeue() {
-				switch err = task.Run(task.Buf); err {
+				switch err = task.Run(task.Arg); err {
 				case nil:
 				case errors.ErrServerShutdown:
 					return err
@@ -165,7 +165,7 @@ func (p *Poller) Polling(callback func(fd int, filter int16) error) error {
 				if task = p.asyncTaskQueue.Dequeue(); task == nil {
 					break
 				}
-				switch err = task.Run(task.Buf); err {
+				switch err = task.Run(task.Arg); err {
 				case nil:
 				case errors.ErrServerShutdown:
 					return err
diff --git a/internal/queue/queue.go b/internal/queue/queue.go
index d9c0a7f62..2c9aa94d4 100644
--- a/internal/queue/queue.go
+++ b/internal/queue/queue.go
@@ -23,12 +23,12 @@ package queue
 import "sync"
 
 // TaskFunc is the callback function executed by poller.
-type TaskFunc func([]byte) error
+type TaskFunc func(interface{}) error
 
 // Task is a wrapper that contains function and its argument.
 type Task struct {
 	Run TaskFunc
-	Buf []byte
+	Arg interface{}
 }
 
 var taskPool = sync.Pool{New: func() interface{} { return new(Task) }}
@@ -40,7 +40,7 @@ func GetTask() *Task {
 
 // PutTask puts the trashy Task back in pool.
 func PutTask(task *Task) {
-	task.Run, task.Buf = nil, nil
+	task.Run, task.Arg = nil, nil
 	taskPool.Put(task)
 }
 
diff --git a/server_unix.go b/server_unix.go
index 0c0eddde3..6ddc3ff26 100644
--- a/server_unix.go
+++ b/server_unix.go
@@ -200,9 +200,7 @@ func (svr *server) stop(s Server) {
 
 	// Notify all loops to close by closing all listeners
 	svr.lb.iterate(func(i int, el *eventloop) bool {
-		err := el.poller.UrgentTrigger(func(_ []byte) error {
-			return errors.ErrServerShutdown
-		})
+		err := el.poller.UrgentTrigger(func(_ interface{}) error { return errors.ErrServerShutdown }, nil)
 		if err != nil {
 			svr.opts.Logger.Errorf("failed to call UrgentTrigger on sub event-loop when stopping server")
 		}
@@ -211,9 +209,7 @@ func (svr *server) stop(s Server) {
 
 	if svr.mainLoop != nil {
 		svr.ln.close()
-		err := svr.mainLoop.poller.UrgentTrigger(func(_ []byte) error {
-			return errors.ErrServerShutdown
-		})
+		err := svr.mainLoop.poller.UrgentTrigger(func(_ interface{}) error { return errors.ErrServerShutdown }, nil)
 		if err != nil {
 			svr.opts.Logger.Errorf("failed to call UrgentTrigger on main event-loop when stopping server")
 		}