Add a new var named GoID, which is the goroutine struct address, use …

asm_amd64.s

@@ -0,0 +1,6 @@
+// func goID() int64
+TEXT ·goID(SB),NOSPLIT,$0-8
+        MOVQ TLS, CX
+        MOVQ 0(CX)(TLS*1), AX
+        MOVQ AX, ret+0(FP)
+        RET

format.go

@@ -101,6 +101,7 @@ var formatterFuncs = map[string]FormatterFunc{
 	"UTCNs":     formatterUTCNs,
 	"n":         formattern,
 	"t":         formattert,
+	"GoID":      formatterGoID,
 }
 
 var formatterFuncsParameterized = map[string]FormatterFuncCreator{
@@ -430,6 +431,10 @@ func formattert(message string, level LogLevel, context LogContextInterface) int
 	return "\t"
 }
 
+func formatterGoID(message string, level LogLevel, context LogContextInterface) interface{} {
+	return goID()
+}
+
 func createDateTimeFormatterFunc(dateTimeFormat string) FormatterFunc {
 	format := dateTimeFormat
 	if format == "" {

goid.go

@@ -0,0 +1,3 @@
+package seelog
+
+func goID() int64