diff --git a/server/torr/apihelper.go b/server/torr/apihelper.go
index 773b609..a190914 100644
--- a/server/torr/apihelper.go
+++ b/server/torr/apihelper.go
@@ -6,7 +6,6 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
-	"sync"
 	"time"
 
 	"github.com/anacrolix/torrent"
@@ -17,8 +16,7 @@ import (
 )
 
 var (
-	bts     *BTServer
-	lockApi sync.Mutex
+	bts *BTServer
 )
 
 func InitApiHelper(bt *BTServer) {
@@ -26,8 +24,6 @@ func InitApiHelper(bt *BTServer) {
 }
 
 func LoadTorrent(tor *Torrent) *Torrent {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	if tor.TorrentSpec == nil {
 		return nil
 	}
@@ -45,8 +41,6 @@ func LoadTorrent(tor *Torrent) *Torrent {
 }
 
 func AddTorrent(spec *torrent.TorrentSpec, title, poster string, data string) (*Torrent, error) {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	torr, err := NewTorrent(spec, bts)
 	if err != nil {
 		log.TLogln("error add torrent:", err)
@@ -86,8 +80,6 @@ func SaveTorrentToDB(torr *Torrent) {
 }
 
 func GetTorrent(hashHex string) *Torrent {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	hash := metainfo.NewHashFromHex(hashHex)
 	tor := bts.GetTorrent(hash)
 	if tor != nil {
@@ -99,8 +91,6 @@ func GetTorrent(hashHex string) *Torrent {
 	if tr != nil {
 		tor = tr
 		go func() {
-			lockApi.Lock()
-			defer lockApi.Unlock()
 			log.TLogln("New torrent", tor.Hash())
 			tr, _ := NewTorrent(tor.TorrentSpec, bts)
 			if tr != nil {
@@ -117,9 +107,6 @@ func GetTorrent(hashHex string) *Torrent {
 }
 
 func SetTorrent(hashHex, title, poster, data string) *Torrent {
-	lockApi.Lock()
-	defer lockApi.Unlock()
-
 	hash := metainfo.NewHashFromHex(hashHex)
 	torr := bts.GetTorrent(hash)
 	torrDb := GetTorrentDB(hash)
@@ -155,8 +142,6 @@ func SetTorrent(hashHex, title, poster, data string) *Torrent {
 }
 
 func RemTorrent(hashHex string) {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	hash := metainfo.NewHashFromHex(hashHex)
 	if sets.BTsets.UseDisk && hashHex != "" && hashHex != "/" {
 		name := filepath.Join(sets.BTsets.TorrentsSavePath, hashHex)
@@ -174,8 +159,6 @@ func RemTorrent(hashHex string) {
 }
 
 func ListTorrent() []*Torrent {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	btlist := bts.ListTorrents()
 	dblist := ListTorrentsDB()
 
@@ -202,8 +185,6 @@ func ListTorrent() []*Torrent {
 }
 
 func DropTorrent(hashHex string) {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	hash := metainfo.NewHashFromHex(hashHex)
 	bts.RemoveTorrent(hash)
 }
@@ -212,8 +193,6 @@ func SetSettings(set *sets.BTSets) {
 	if sets.ReadOnly {
 		return
 	}
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	log.TLogln("drop all torrents")
 	dropAllTorrent()
 	time.Sleep(time.Second * 2)
@@ -230,8 +209,6 @@ func SetDefSettings() {
 	if sets.ReadOnly {
 		return
 	}
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	log.TLogln("drop all torrents")
 	dropAllTorrent()
 	time.Sleep(time.Second * 2)
@@ -252,8 +229,6 @@ func dropAllTorrent() {
 }
 
 func Shutdown() {
-	lockApi.Lock()
-	defer lockApi.Unlock()
 	bts.Disconnect()
 	sets.CloseDB()
 	log.TLogln("Received shutdown. Quit")
@@ -265,8 +240,6 @@ func WriteStatus(w io.Writer) {
 }
 
 func Preload(torr *Torrent, index int) {
-	lockApi.Lock()
-	lockApi.Unlock()
 	cache := float32(sets.BTsets.CacheSize)
 	preload := float32(sets.BTsets.PreloadCache)
 	size := int64((cache / 100.0) * preload)