diff --git a/FFI for Python-Node-PHP/lib/yitidgen.dll b/FFI for Python-Node-PHP/lib/yitidgen.dll
index b3b9a92..b7f7126 100644
Binary files a/FFI for Python-Node-PHP/lib/yitidgen.dll and b/FFI for Python-Node-PHP/lib/yitidgen.dll differ
diff --git a/Go/source/idgen/YitIdHelper.go b/Go/source/idgen/YitIdHelper.go
index 7cf5f00..e1084b3 100644
--- a/Go/source/idgen/YitIdHelper.go
+++ b/Go/source/idgen/YitIdHelper.go
@@ -58,8 +58,10 @@ func SetIdGenerator(options *IdGeneratorOptions) {
 func NextId() uint64 {
 	if idGenerator == nil {
 		singletonMutex.Lock()
-		options := NewIdGeneratorOptions(1)
-		idGenerator = NewDefaultIdGenerator(options)
+		if idGenerator == nil {
+			options := NewIdGeneratorOptions(1)
+			idGenerator = NewDefaultIdGenerator(options)
+		}
 		singletonMutex.Unlock()
 	}
 
diff --git a/Go/source/main.go b/Go/source/main.go
index f04a935..4426635 100644
--- a/Go/source/main.go
+++ b/Go/source/main.go
@@ -8,13 +8,13 @@ import (
 	"yitidgen/regworkerid"
 )
 
-///export SetOptions
+//export SetOptions
 func SetOptions(workerId uint16) {
 	var options = idgen.NewIdGeneratorOptions(workerId)
 	idgen.SetIdGenerator(options)
 }
 
-///export NextId
+//export NextId
 func NextId() uint64 {
 	return idgen.NextId()
 }
@@ -65,5 +65,6 @@ func main() {
 
 }
 
-// go build -o target\yitidgengo.dll -buildmode=c-shared main.go
-
+// go build -o ./target/yitidgengo.dll -buildmode=c-shared main.go
+// go install -buildmode=shared -linkshared std
+// go build -o ./target/yitidgengo.so -buildmode=c-shared main.go