diff --git a/.example/net/ghttp/server/session/session.go b/.example/net/ghttp/server/session/session.go
index e41215bd9..111c73eec 100644
--- a/.example/net/ghttp/server/session/session.go
+++ b/.example/net/ghttp/server/session/session.go
@@ -9,7 +9,7 @@ import (
 
 func main() {
 	s := g.Server()
-	s.SetSessionMaxAge(2 * time.Second)
+	s.SetSessionMaxAge(61 * time.Second)
 	s.BindHandler("/set", func(r *ghttp.Request) {
 		r.Session.Set("time", gtime.Second())
 		r.Response.Write("ok")
diff --git a/container/gmap/gmap_hash_any_any_map.go b/container/gmap/gmap_hash_any_any_map.go
index 028824304..edb207ae3 100644
--- a/container/gmap/gmap_hash_any_any_map.go
+++ b/container/gmap/gmap_hash_any_any_map.go
@@ -141,6 +141,41 @@ func (m *AnyAnyMap) Get(key interface{}) interface{} {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *AnyAnyMap) Pop() (key, value interface{}) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *AnyAnyMap) Pops(size int) map[interface{}]interface{} {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[interface{}]interface{}, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -321,10 +356,7 @@ func (m *AnyAnyMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *AnyAnyMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_hash_int_any_map.go b/container/gmap/gmap_hash_int_any_map.go
index 5cfc29850..4b51e9985 100644
--- a/container/gmap/gmap_hash_int_any_map.go
+++ b/container/gmap/gmap_hash_int_any_map.go
@@ -141,6 +141,41 @@ func (m *IntAnyMap) Get(key int) interface{} {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *IntAnyMap) Pop() (key int, value interface{}) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *IntAnyMap) Pops(size int) map[int]interface{} {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[int]interface{}, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -321,10 +356,7 @@ func (m *IntAnyMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *IntAnyMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_hash_int_int_map.go b/container/gmap/gmap_hash_int_int_map.go
index b2d7b9d6d..78c22f502 100644
--- a/container/gmap/gmap_hash_int_int_map.go
+++ b/container/gmap/gmap_hash_int_int_map.go
@@ -139,6 +139,41 @@ func (m *IntIntMap) Get(key int) int {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *IntIntMap) Pop() (key, value int) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *IntIntMap) Pops(size int) map[int]int {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[int]int, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -298,10 +333,7 @@ func (m *IntIntMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *IntIntMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_hash_int_str_map.go b/container/gmap/gmap_hash_int_str_map.go
index ce3f53918..f9ddd5f38 100644
--- a/container/gmap/gmap_hash_int_str_map.go
+++ b/container/gmap/gmap_hash_int_str_map.go
@@ -139,6 +139,41 @@ func (m *IntStrMap) Get(key int) string {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *IntStrMap) Pop() (key int, value string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *IntStrMap) Pops(size int) map[int]string {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[int]string, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -298,10 +333,7 @@ func (m *IntStrMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *IntStrMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_hash_str_any_map.go b/container/gmap/gmap_hash_str_any_map.go
index 6ece9ccb3..2a9491437 100644
--- a/container/gmap/gmap_hash_str_any_map.go
+++ b/container/gmap/gmap_hash_str_any_map.go
@@ -135,6 +135,41 @@ func (m *StrAnyMap) Get(key string) interface{} {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *StrAnyMap) Pop() (key string, value interface{}) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *StrAnyMap) Pops(size int) map[string]interface{} {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[string]interface{}, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -317,10 +352,7 @@ func (m *StrAnyMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *StrAnyMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_hash_str_int_map.go b/container/gmap/gmap_hash_str_int_map.go
index a536e2be5..c2d338bb5 100644
--- a/container/gmap/gmap_hash_str_int_map.go
+++ b/container/gmap/gmap_hash_str_int_map.go
@@ -139,6 +139,41 @@ func (m *StrIntMap) Get(key string) int {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *StrIntMap) Pop() (key string, value int) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *StrIntMap) Pops(size int) map[string]int {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[string]int, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -300,10 +335,7 @@ func (m *StrIntMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *StrIntMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_hash_str_str_map.go b/container/gmap/gmap_hash_str_str_map.go
index 3d0944cea..89abbce52 100644
--- a/container/gmap/gmap_hash_str_str_map.go
+++ b/container/gmap/gmap_hash_str_str_map.go
@@ -139,6 +139,41 @@ func (m *StrStrMap) Get(key string) string {
 	return val
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *StrStrMap) Pop() (key, value string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key, value = range m.data {
+		delete(m.data, key)
+		return
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *StrStrMap) Pops(size int) map[string]string {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[string]string, size)
+	for k, v := range m.data {
+		delete(m.data, k)
+		newMap[k] = v
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
@@ -300,10 +335,7 @@ func (m *StrStrMap) Size() int {
 // IsEmpty checks whether the map is empty.
 // It returns true if map is empty, or else false.
 func (m *StrStrMap) IsEmpty() bool {
-	m.mu.RLock()
-	empty := len(m.data) == 0
-	m.mu.RUnlock()
-	return empty
+	return m.Size() == 0
 }
 
 // Clear deletes all data of the map, it will remake a new underlying data map.
diff --git a/container/gmap/gmap_list_map.go b/container/gmap/gmap_list_map.go
index b3807792e..f4539fe42 100644
--- a/container/gmap/gmap_list_map.go
+++ b/container/gmap/gmap_list_map.go
@@ -189,6 +189,45 @@ func (m *ListMap) Get(key interface{}) (value interface{}) {
 	return
 }
 
+// Pop retrieves and deletes an item from the map.
+func (m *ListMap) Pop() (key, value interface{}) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for k, e := range m.data {
+		value = e.Value.(*gListMapNode).value
+		delete(m.data, k)
+		m.list.Remove(e)
+		return k, value
+	}
+	return
+}
+
+// Pops retrieves and deletes <size> items from the map.
+// It returns all items if size == -1.
+func (m *ListMap) Pops(size int) map[interface{}]interface{} {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if size > len(m.data) || size == -1 {
+		size = len(m.data)
+	}
+	if size == 0 {
+		return nil
+	}
+	index := 0
+	newMap := make(map[interface{}]interface{}, size)
+	for k, e := range m.data {
+		value := e.Value.(*gListMapNode).value
+		delete(m.data, k)
+		m.list.Remove(e)
+		newMap[k] = value
+		index++
+		if index == size {
+			break
+		}
+	}
+	return newMap
+}
+
 // doSetWithLockCheck checks whether value of the key exists with mutex.Lock,
 // if not exists, set value to the map with given <key>,
 // or else just return the existing value.
diff --git a/container/gmap/gmap_z_unit_any_any_test.go b/container/gmap/gmap_z_unit_any_any_test.go
index 42305c4f5..39af9a5fb 100644
--- a/container/gmap/gmap_z_unit_any_any_test.go
+++ b/container/gmap/gmap_z_unit_any_any_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"github.com/gogf/gf/util/gconv"
 	"testing"
@@ -221,3 +222,56 @@ func Test_AnyAnyMap_Json(t *testing.T) {
 		gtest.Assert(m.Get("k2"), data["k2"])
 	})
 }
+
+func Test_AnyAnyMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewAnyAnyMapFrom(g.MapAnyAny{
+			"k1": "v1",
+			"k2": "v2",
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v1, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v2, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_AnyAnyMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewAnyAnyMapFrom(g.MapAnyAny{
+			"k1": "v1",
+			"k2": "v2",
+			"k3": "v3",
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_int_any_test.go b/container/gmap/gmap_z_unit_int_any_test.go
index a9c2df3e6..4f06189f9 100644
--- a/container/gmap/gmap_z_unit_int_any_test.go
+++ b/container/gmap/gmap_z_unit_int_any_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"testing"
 
@@ -203,3 +204,56 @@ func Test_IntAnyMap_Json(t *testing.T) {
 		gtest.Assert(m.Get(2), data[2])
 	})
 }
+
+func Test_IntAnyMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewIntAnyMapFrom(g.MapIntAny{
+			1: "v1",
+			2: "v2",
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{1, 2})
+		gtest.AssertIN(v1, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{1, 2})
+		gtest.AssertIN(v2, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_IntAnyMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewIntAnyMapFrom(g.MapIntAny{
+			1: "v1",
+			2: "v2",
+			3: "v3",
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{1, 2, 3})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{1, 2, 3})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_int_int_test.go b/container/gmap/gmap_z_unit_int_int_test.go
index 4e376ecff..070a3b628 100644
--- a/container/gmap/gmap_z_unit_int_int_test.go
+++ b/container/gmap/gmap_z_unit_int_int_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"testing"
 
@@ -206,3 +207,56 @@ func Test_IntIntMap_Json(t *testing.T) {
 		gtest.Assert(m.Get(2), data[2])
 	})
 }
+
+func Test_IntIntMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewIntIntMapFrom(g.MapIntInt{
+			1: 11,
+			2: 22,
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{1, 2})
+		gtest.AssertIN(v1, g.Slice{11, 22})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{1, 2})
+		gtest.AssertIN(v2, g.Slice{11, 22})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_IntIntMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewIntIntMapFrom(g.MapIntInt{
+			1: 11,
+			2: 22,
+			3: 33,
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{1, 2, 3})
+			gtest.AssertIN(v, g.Slice{11, 22, 33})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{1, 2, 3})
+			gtest.AssertIN(v, g.Slice{11, 22, 33})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_int_str_test.go b/container/gmap/gmap_z_unit_int_str_test.go
index b348ccbfe..541946b1a 100644
--- a/container/gmap/gmap_z_unit_int_str_test.go
+++ b/container/gmap/gmap_z_unit_int_str_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"testing"
 
@@ -207,3 +208,56 @@ func Test_IntStrMap_Json(t *testing.T) {
 		gtest.Assert(m.Get(2), data[2])
 	})
 }
+
+func Test_IntStrMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewIntStrMapFrom(g.MapIntStr{
+			1: "v1",
+			2: "v2",
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{1, 2})
+		gtest.AssertIN(v1, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{1, 2})
+		gtest.AssertIN(v2, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_IntStrMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewIntStrMapFrom(g.MapIntStr{
+			1: "v1",
+			2: "v2",
+			3: "v3",
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{1, 2, 3})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{1, 2, 3})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_list_map_test.go b/container/gmap/gmap_z_unit_list_map_test.go
index a8f75838c..4b1c53b36 100644
--- a/container/gmap/gmap_z_unit_list_map_test.go
+++ b/container/gmap/gmap_z_unit_list_map_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/util/gconv"
 	"testing"
 
@@ -177,3 +178,56 @@ func Test_ListMap_Json(t *testing.T) {
 		gtest.Assert(m.Get("k2"), data["k2"])
 	})
 }
+
+func Test_ListMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewListMapFrom(g.MapAnyAny{
+			"k1": "v1",
+			"k2": "v2",
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v1, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v2, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_ListMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewListMapFrom(g.MapAnyAny{
+			"k1": "v1",
+			"k2": "v2",
+			"k3": "v3",
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_str_any_test.go b/container/gmap/gmap_z_unit_str_any_test.go
index 831e07108..e5a05ec95 100644
--- a/container/gmap/gmap_z_unit_str_any_test.go
+++ b/container/gmap/gmap_z_unit_str_any_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"testing"
 
@@ -215,3 +216,56 @@ func Test_StrAnyMap_Json(t *testing.T) {
 		gtest.Assert(m.Get("k2"), data["k2"])
 	})
 }
+
+func Test_StrAnyMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewStrAnyMapFrom(g.MapStrAny{
+			"k1": "v1",
+			"k2": "v2",
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v1, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v2, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_StrAnyMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewStrAnyMapFrom(g.MapStrAny{
+			"k1": "v1",
+			"k2": "v2",
+			"k3": "v3",
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_str_int_test.go b/container/gmap/gmap_z_unit_str_int_test.go
index 2cd1ae1dd..ba20d8103 100644
--- a/container/gmap/gmap_z_unit_str_int_test.go
+++ b/container/gmap/gmap_z_unit_str_int_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"testing"
 
@@ -218,3 +219,56 @@ func Test_StrIntMap_Json(t *testing.T) {
 		gtest.Assert(m.Get("k2"), data["k2"])
 	})
 }
+
+func Test_StrIntMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewStrIntMapFrom(g.MapStrInt{
+			"k1": 11,
+			"k2": 22,
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v1, g.Slice{11, 22})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v2, g.Slice{11, 22})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_StrIntMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewStrIntMapFrom(g.MapStrInt{
+			"k1": 11,
+			"k2": 22,
+			"k3": 33,
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{11, 22, 33})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{11, 22, 33})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gmap/gmap_z_unit_str_str_test.go b/container/gmap/gmap_z_unit_str_str_test.go
index 3ff191d7d..1105d5475 100644
--- a/container/gmap/gmap_z_unit_str_str_test.go
+++ b/container/gmap/gmap_z_unit_str_str_test.go
@@ -8,6 +8,7 @@ package gmap_test
 
 import (
 	"encoding/json"
+	"github.com/gogf/gf/container/garray"
 	"github.com/gogf/gf/frame/g"
 	"testing"
 
@@ -215,3 +216,56 @@ func Test_StrStrMap_Json(t *testing.T) {
 		gtest.Assert(m.Get("k2"), data["k2"])
 	})
 }
+
+func Test_StrStrMap_Pop(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewStrStrMapFrom(g.MapStrStr{
+			"k1": "v1",
+			"k2": "v2",
+		})
+		gtest.Assert(m.Size(), 2)
+
+		k1, v1 := m.Pop()
+		gtest.AssertIN(k1, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v1, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 1)
+		k2, v2 := m.Pop()
+		gtest.AssertIN(k2, g.Slice{"k1", "k2"})
+		gtest.AssertIN(v2, g.Slice{"v1", "v2"})
+		gtest.Assert(m.Size(), 0)
+
+		gtest.AssertNE(k1, k2)
+		gtest.AssertNE(v1, v2)
+	})
+}
+
+func Test_StrStrMap_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		m := gmap.NewStrStrMapFrom(g.MapStrStr{
+			"k1": "v1",
+			"k2": "v2",
+			"k3": "v3",
+		})
+		gtest.Assert(m.Size(), 3)
+
+		kArray := garray.New()
+		vArray := garray.New()
+		for k, v := range m.Pops(1) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 2)
+		for k, v := range m.Pops(2) {
+			gtest.AssertIN(k, g.Slice{"k1", "k2", "k3"})
+			gtest.AssertIN(v, g.Slice{"v1", "v2", "v3"})
+			kArray.Append(k)
+			vArray.Append(v)
+		}
+		gtest.Assert(m.Size(), 0)
+
+		gtest.Assert(kArray.Unique().Len(), 3)
+		gtest.Assert(vArray.Unique().Len(), 3)
+	})
+}
diff --git a/container/gset/gset_any_set.go b/container/gset/gset_any_set.go
index 9346d6bc6..79c7dbc92 100644
--- a/container/gset/gset_any_set.go
+++ b/container/gset/gset_any_set.go
@@ -373,24 +373,30 @@ func (set *Set) Sum() (sum int) {
 
 // Pops randomly pops an item from set.
 func (set *Set) Pop() interface{} {
-	set.mu.RLock()
-	defer set.mu.RUnlock()
+	set.mu.Lock()
+	defer set.mu.Unlock()
 	for k, _ := range set.data {
+		delete(set.data, k)
 		return k
 	}
 	return nil
 }
 
 // Pops randomly pops <size> items from set.
+// It returns all items if size == -1.
 func (set *Set) Pops(size int) []interface{} {
-	set.mu.RLock()
-	defer set.mu.RUnlock()
-	if size > len(set.data) {
+	set.mu.Lock()
+	defer set.mu.Unlock()
+	if size > len(set.data) || size == -1 {
 		size = len(set.data)
 	}
+	if size <= 0 {
+		return nil
+	}
 	index := 0
 	array := make([]interface{}, size)
 	for k, _ := range set.data {
+		delete(set.data, k)
 		array[index] = k
 		index++
 		if index == size {
diff --git a/container/gset/gset_int_set.go b/container/gset/gset_int_set.go
index c831e1caf..ab8bb8856 100644
--- a/container/gset/gset_int_set.go
+++ b/container/gset/gset_int_set.go
@@ -346,24 +346,30 @@ func (set *IntSet) Sum() (sum int) {
 
 // Pops randomly pops an item from set.
 func (set *IntSet) Pop() int {
-	set.mu.RLock()
-	defer set.mu.RUnlock()
+	set.mu.Lock()
+	defer set.mu.Unlock()
 	for k, _ := range set.data {
+		delete(set.data, k)
 		return k
 	}
 	return 0
 }
 
 // Pops randomly pops <size> items from set.
+// It returns all items if size == -1.
 func (set *IntSet) Pops(size int) []int {
-	set.mu.RLock()
-	defer set.mu.RUnlock()
-	if size > len(set.data) {
+	set.mu.Lock()
+	defer set.mu.Unlock()
+	if size > len(set.data) || size == -1 {
 		size = len(set.data)
 	}
+	if size <= 0 {
+		return nil
+	}
 	index := 0
 	array := make([]int, size)
 	for k, _ := range set.data {
+		delete(set.data, k)
 		array[index] = k
 		index++
 		if index == size {
diff --git a/container/gset/gset_str_set.go b/container/gset/gset_str_set.go
index caec5641b..887a000ae 100644
--- a/container/gset/gset_str_set.go
+++ b/container/gset/gset_str_set.go
@@ -360,24 +360,30 @@ func (set *StrSet) Sum() (sum int) {
 
 // Pops randomly pops an item from set.
 func (set *StrSet) Pop() string {
-	set.mu.RLock()
-	defer set.mu.RUnlock()
+	set.mu.Lock()
+	defer set.mu.Unlock()
 	for k, _ := range set.data {
+		delete(set.data, k)
 		return k
 	}
 	return ""
 }
 
 // Pops randomly pops <size> items from set.
+// It returns all items if size == -1.
 func (set *StrSet) Pops(size int) []string {
-	set.mu.RLock()
-	defer set.mu.RUnlock()
-	if size > len(set.data) {
+	set.mu.Lock()
+	defer set.mu.Unlock()
+	if size > len(set.data) || size == -1 {
 		size = len(set.data)
 	}
+	if size <= 0 {
+		return nil
+	}
 	index := 0
 	array := make([]string, size)
 	for k, _ := range set.data {
+		delete(set.data, k)
 		array[index] = k
 		index++
 		if index == size {
diff --git a/container/gset/gset_z_unit_any_test.go b/container/gset/gset_z_unit_any_test.go
index 18dd7b246..c53741dff 100644
--- a/container/gset/gset_z_unit_any_test.go
+++ b/container/gset/gset_z_unit_any_test.go
@@ -261,19 +261,35 @@ func TestSet_Sum(t *testing.T) {
 
 func TestSet_Pop(t *testing.T) {
 	gtest.Case(t, func() {
-		s1 := gset.New(true)
-		s1.Add(1).Add(2).Add(3).Add(4)
-		gtest.AssertIN(s1.Pop(), []int{1, 2, 3, 4})
+		s := gset.New(true)
+		s.Add(1).Add(2).Add(3).Add(4)
+		gtest.Assert(s.Size(), 4)
+		gtest.AssertIN(s.Pop(), []int{1, 2, 3, 4})
+		gtest.Assert(s.Size(), 3)
 	})
 }
 
 func TestSet_Pops(t *testing.T) {
 	gtest.Case(t, func() {
-		s1 := gset.New(true)
-		s1.Add(1).Add(2).Add(3).Add(4)
-		gtest.AssertIN(s1.Pops(1), []int{1, 2, 3, 4})
-		gtest.AssertIN(s1.Pops(6), []int{1, 2, 3, 4})
-		gtest.Assert(len(s1.Pops(2)), 2)
+		s := gset.New(true)
+		s.Add(1).Add(2).Add(3).Add(4)
+		gtest.Assert(s.Size(), 4)
+		gtest.Assert(s.Pops(0), nil)
+		gtest.AssertIN(s.Pops(1), []int{1, 2, 3, 4})
+		gtest.Assert(s.Size(), 3)
+		a := s.Pops(6)
+		gtest.Assert(len(a), 3)
+		gtest.AssertIN(a, []int{1, 2, 3, 4})
+		gtest.Assert(s.Size(), 0)
+	})
+
+	gtest.Case(t, func() {
+		s := gset.New(true)
+		a := []interface{}{1, 2, 3, 4}
+		s.Add(a...)
+		gtest.Assert(s.Size(), 4)
+		gtest.Assert(s.Pops(-2), nil)
+		gtest.AssertIN(s.Pops(-1), a)
 	})
 }
 
diff --git a/container/gset/gset_z_unit_int_test.go b/container/gset/gset_z_unit_int_test.go
index e15ae5197..70886c277 100644
--- a/container/gset/gset_z_unit_int_test.go
+++ b/container/gset/gset_z_unit_int_test.go
@@ -223,11 +223,36 @@ func TestIntSet_Sum(t *testing.T) {
 
 func TestIntSet_Pop(t *testing.T) {
 	gtest.Case(t, func() {
-		s1 := gset.NewIntSet()
-		s1.Add(4).Add(2).Add(3)
-		gtest.AssertIN(s1.Pop(), []int{4, 2, 3})
-		gtest.AssertIN(s1.Pop(), []int{4, 2, 3})
-		gtest.Assert(s1.Size(), 3)
+		s := gset.NewIntSet()
+		s.Add(4).Add(2).Add(3)
+		gtest.Assert(s.Size(), 3)
+		gtest.AssertIN(s.Pop(), []int{4, 2, 3})
+		gtest.AssertIN(s.Pop(), []int{4, 2, 3})
+		gtest.Assert(s.Size(), 1)
+	})
+}
+
+func TestIntSet_Pops(t *testing.T) {
+	gtest.Case(t, func() {
+		s := gset.NewIntSet()
+		s.Add(1).Add(4).Add(2).Add(3)
+		gtest.Assert(s.Size(), 4)
+		gtest.Assert(s.Pops(0), nil)
+		gtest.AssertIN(s.Pops(1), []int{1, 4, 2, 3})
+		gtest.Assert(s.Size(), 3)
+		a := s.Pops(2)
+		gtest.Assert(len(a), 2)
+		gtest.AssertIN(a, []int{1, 4, 2, 3})
+		gtest.Assert(s.Size(), 1)
+	})
+
+	gtest.Case(t, func() {
+		s := gset.NewIntSet(true)
+		a := []int{1, 2, 3, 4}
+		s.Add(a...)
+		gtest.Assert(s.Size(), 4)
+		gtest.Assert(s.Pops(-2), nil)
+		gtest.AssertIN(s.Pops(-1), a)
 	})
 }
 
diff --git a/container/gset/gset_z_unit_str_test.go b/container/gset/gset_z_unit_str_test.go
index 45c271991..d1f95c401 100644
--- a/container/gset/gset_z_unit_str_test.go
+++ b/container/gset/gset_z_unit_str_test.go
@@ -259,20 +259,36 @@ func TestStrSet_Remove(t *testing.T) {
 
 func TestStrSet_Pop(t *testing.T) {
 	gtest.Case(t, func() {
-		s1 := gset.NewStrSetFrom([]string{"a", "b", "c"}, true)
-		str1 := s1.Pop()
-		gtest.Assert(strings.Contains("a,b,c", str1), true)
+		a := []string{"a", "b", "c", "d"}
+		s := gset.NewStrSetFrom(a, true)
+		gtest.Assert(s.Size(), 4)
+		gtest.AssertIN(s.Pop(), a)
+		gtest.Assert(s.Size(), 3)
+		gtest.AssertIN(s.Pop(), a)
+		gtest.Assert(s.Size(), 2)
 	})
 }
 
 func TestStrSet_Pops(t *testing.T) {
 	gtest.Case(t, func() {
-		s1 := gset.NewStrSetFrom([]string{"a", "b", "c"}, true)
-		strs1 := s1.Pops(2)
-		gtest.AssertIN(strs1, []string{"a", "b", "c"})
-		gtest.Assert(len(strs1), 2)
-		str2 := s1.Pops(7)
-		gtest.AssertIN(str2, []string{"a", "b", "c"})
+		a := []string{"a", "b", "c", "d"}
+		s := gset.NewStrSetFrom(a, true)
+		array := s.Pops(2)
+		gtest.Assert(len(array), 2)
+		gtest.Assert(s.Size(), 2)
+		gtest.AssertIN(array, a)
+		gtest.Assert(s.Pops(0), nil)
+		gtest.AssertIN(s.Pops(2), a)
+		gtest.Assert(s.Size(), 0)
+	})
+
+	gtest.Case(t, func() {
+		s := gset.NewStrSet(true)
+		a := []string{"1", "2", "3", "4"}
+		s.Add(a...)
+		gtest.Assert(s.Size(), 4)
+		gtest.Assert(s.Pops(-2), nil)
+		gtest.AssertIN(s.Pops(-1), a)
 	})
 }
 
diff --git a/os/gsession/gsession_storage.go b/os/gsession/gsession_storage.go
index 8a1b10d84..6101a0ba1 100644
--- a/os/gsession/gsession_storage.go
+++ b/os/gsession/gsession_storage.go
@@ -28,7 +28,7 @@ type Storage interface {
 	RemoveAll() error
 
 	// GetSession returns the session data map for given session id.
-	// The parameter specifies the TTL for this session.
+	// The parameter <ttl> specifies the TTL for this session.
 	// It returns nil if the TTL is exceeded.
 	GetSession(id string, ttl time.Duration) map[string]interface{}
 	// SetSession updates the data map for specified session id.
diff --git a/os/gsession/gsession_storage_file.go b/os/gsession/gsession_storage_file.go
index 00815fd3c..210e1b78a 100644
--- a/os/gsession/gsession_storage_file.go
+++ b/os/gsession/gsession_storage_file.go
@@ -72,8 +72,13 @@ func NewStorageFile(path ...string) *StorageFile {
 		cryptoEnabled: DefaultStorageFileCryptoEnabled,
 		updatingIdSet: gset.NewStrSet(true),
 	}
+	// Batch updates the TTL for session ids timely.
 	gtimer.AddSingleton(DefaultStorageFileLoopInterval, func() {
-		for _, id := range s.updatingIdSet.Slice() {
+		id := ""
+		for {
+			if id = s.updatingIdSet.Pop(); id == "" {
+				break
+			}
 			s.doUpdateTTL(id)
 		}
 	})
@@ -160,7 +165,6 @@ func (s *StorageFile) GetSession(id string, ttl time.Duration) map[string]interf
 }
 
 // SetSession updates the content for session id.
-// Note that the parameter <content> is the serialized bytes for session map.
 func (s *StorageFile) SetSession(id string, data map[string]interface{}) error {
 	path := s.sessionFilePath(id)
 	content, err := json.Marshal(data)