golang 中map并发读写操作

sync.RWMutex

var counter = struct{
    sync.RWMutex
    m map[string]int
}{m: make(map[string]int)}

从counter读取数据，使用读锁

counter.RLock()
n := counter.m["some_key"]
counter.RUnlock()
fmt.Println("some_key:", n)

向counter写数据，使用写锁

counter.Lock()
counter.m["some_key"]++
counter.Unlock()

参考：http://blog.golang.org/go-maps-in-action

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