Channel Based Map

channel.go

package main

type conn struct{}

type connectionMap struct {
	connections map[string]*conn
	actions     chan func()
}

func NewMap() *connectionMap {
	res := &connectionMap{
		connections: make(map[string]*conn),
		actions:     make(chan func()),
	}
	go func() {
		for action := range res.actions {
			action()
		}
	}()
	return res
}

func (cm *connectionMap) get(key string) (c *conn) {
	ret := make(chan bool)
	cm.actions <- func() {
		c = cm.connections[key]
		ret <- true
	}
	<-ret
	return
}

func (cm *connectionMap) set(key string, c *conn) {
	cm.actions <- func() { cm.connections[key] = c }
}

func main() {
	myMap := NewMap()
	myMap.set("key", new(conn))
}