【Go】fatal error: concurrent map writes 问题记录

我使用协程，handle函数内对map读写

//全局变量
var map map[string]string
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	assign := averageAssign(epsTree, 3)
	var wg sync.WaitGroup
	wg.Add(3)
	for i, _ := range assign {
		go handle(assign[i], i, &wg)
	}
	wg.Wait()
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修复：

type UMap struct {
	sync.RWMutex
	Map map[string]string
}

var umap *UMap
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umap = &UMap{
		Map: make(map[string]string),
	}
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//读
func (l *UMap) readMap(key string) (string, bool) {
	l.RLock()
	value, ok := l.Map[key]
	l.RUnlock()
	return value, ok
}
//写
func (l *UMap) writeMap(key string, value string) {
	l.Lock()
	l.Map[key] = value
	l.Unlock()
}
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