From acf2b44fe3aa7743e82133dbe297deafe642f1a5 Mon Sep 17 00:00:00 2001
From: Radu Ioan Fericean <radu@fericean.ro>
Date: Fri, 3 Apr 2015 21:21:14 +0300
Subject: [PATCH] simler lock for account guard

---
 engine/accountlock.go | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/engine/accountlock.go b/engine/accountlock.go
index 5309f75b8..6a2a20ee8 100644
--- a/engine/accountlock.go
+++ b/engine/accountlock.go
@@ -30,7 +30,7 @@ func init() {
 
 type AccountLock struct {
 	queue map[string]chan bool
-	mu    sync.RWMutex
+	mu    sync.Mutex
 }
 
 func NewAccountLock() *AccountLock {
@@ -38,34 +38,30 @@ func NewAccountLock() *AccountLock {
 }
 
 func (cm *AccountLock) GuardCallCost(handler func() (*CallCost, error), name string) (reply *CallCost, err error) {
-	cm.mu.RLock()
+	cm.mu.Lock()
 	lock, exists := AccLock.queue[name]
-	cm.mu.RUnlock()
 	if !exists {
-		cm.mu.Lock()
 		lock = make(chan bool, 1)
 		AccLock.queue[name] = lock
-		cm.mu.Unlock()
 	}
 	lock <- true
+	cm.mu.Unlock()
 	reply, err = handler()
 	<-lock
 	return
 }
 
 func (cm *AccountLock) Guard(handler func() (float64, error), names ...string) (reply float64, err error) {
+	cm.mu.Lock()
 	for _, name := range names {
-		cm.mu.RLock()
 		lock, exists := AccLock.queue[name]
-		cm.mu.RUnlock()
 		if !exists {
-			cm.mu.Lock()
 			lock = make(chan bool, 1)
 			AccLock.queue[name] = lock
-			cm.mu.Unlock()
 		}
 		lock <- true
 	}
+	cm.mu.Unlock()
 	reply, err = handler()
 	for _, name := range names {
 		lock := AccLock.queue[name]