Enhanced newObjectLayerFn (#3837)

cmd/object-api-common.go

@@ -38,14 +38,14 @@ const (
 )
 
 // Global object layer mutex, used for safely updating object layer.
-var globalObjLayerMutex *sync.Mutex
+var globalObjLayerMutex *sync.RWMutex
 
 // Global object layer, only accessed by newObjectLayerFn().
 var globalObjectAPI ObjectLayer
 
 func init() {
 	// Initialize this once per server initialization.
-	globalObjLayerMutex = &sync.Mutex{}
+	globalObjLayerMutex = &sync.RWMutex{}
 }
 
 // Check if the disk is remote.

cmd/routers.go

@@ -22,10 +22,11 @@ import (
 	router "github.com/gorilla/mux"
 )
 
-func newObjectLayerFn() ObjectLayer {
-	globalObjLayerMutex.Lock()
-	defer globalObjLayerMutex.Unlock()
-	return globalObjectAPI
+func newObjectLayerFn() (layer ObjectLayer) {
+	globalObjLayerMutex.RLock()
+	layer = globalObjectAPI
+	globalObjLayerMutex.RUnlock()
+	return
 }
 
 // Composed function registering routers for only distributed XL setup.