diff --git a/userlock/userlock.go b/userlock/userlock.go
new file mode 100644
index 000000000..6a9813fdb
--- /dev/null
+++ b/userlock/userlock.go
@@ -0,0 +1,71 @@
+/*
+Rating system designed to be used in VoIP Carriers World
+Copyright (C) 2012  Radu Ioan Fericean
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package main
+
+import (
+	"log"
+	"time"
+	"sync"
+)
+
+var (
+	cm = NewChanMutex()
+)
+
+type Command struct {
+	name string
+	data string
+}
+
+func (c *Command) Execute() {
+	ch := cm.pipe[c.name]
+	ch <- c
+	log.Print(c.data)
+	time.Sleep(1 * time.Second)
+	log.Print("end ", c.data)
+	<-ch
+}
+
+type ChanMutex struct {
+	pipe map[string]chan *Command
+	mu   sync.Mutex
+}
+
+func NewChanMutex() *ChanMutex {
+	return &ChanMutex{pipe: make(map[string]chan *Command)}
+}
+
+func (cm *ChanMutex) Execute(c *Command) {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+	ch, exists := cm.pipe[c.name]
+	if !exists {
+		log.Print("make chanell for: ", c.name)
+		ch = make(chan *Command, 1)
+		cm.pipe[c.name] = ch
+	}
+	go c.Execute()
+}
+
+func main() {
+	cm.Execute(&Command{"vdf:rif", "prima rif"})
+	cm.Execute(&Command{"vdf:dan", "prima Dan"})
+	cm.Execute(&Command{"vdf:rif", "a doua rif"})
+	time.Sleep(8 * time.Second)
+}