improved mutex usage

packages/events/event.go

@@ -10,22 +10,22 @@ type Event struct {
 
 func (this *Event) Attach(closure *Closure) {
 	this.mutex.Lock()
-	defer this.mutex.Unlock()
 	this.callbacks[closure.Id] = closure.Fnc
+	this.mutex.Unlock()
 }
 
 func (this *Event) Detach(closure *Closure) {
 	this.mutex.Lock()
-	defer this.mutex.Unlock()
 	delete(this.callbacks, closure.Id)
+	this.mutex.Unlock()
 }
 
 func (this *Event) Trigger(params ...interface{}) {
 	this.mutex.RLock()
-	defer this.mutex.RUnlock()
 	for _, handler := range this.callbacks {
 		this.triggerFunc(handler, params...)
 	}
+	this.mutex.RUnlock()
 }
 
 func NewEvent(triggerFunc func(handler interface{}, params ...interface{})) *Event {