golang鎖使用(map讀寫)


var source *memorySource
var present bool

p.lock.RLock()
if source, present = p.sources[name]; !present {
	// The source wasn't found, so we'll create it.
	p.lock.RUnlock()
	p.lock.Lock()
	if source, present = p.sources[name]; !present {
		source = &memorySource{
			name: name,
			metrics: map[string]*memoryMetric{},
		}

		// Insert the newly created *memorySource.
		p.sources[name] = source
	}
	p.lock.Unlock()
} else {
	p.lock.RUnlock()
}

怕失效就自己再收藏一次

轉載自 : http://studygolang.com/articles/2775


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