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This article mainly explains the "go singleton how to achieve double detection is safe", the article explains the content is simple and clear, easy to learn and understand, now please follow the editor's ideas slowly in depth, together to study and learn "go singleton how to achieve double detection is safe" bar!

Current situation

At present, some projects directly use Mutex locks, while others directly judge that nil is created. For the former, the performance of locking is poor every time, while for the latter, there will be multiple instances, so it is not a single instance.

Improve

If you want to improve it, instead of discussing hungry and thread-unsafe implementations here, there are two common lazy implementations of thread safety in go:

Double check sync.Once

Double check example: package main import ("sync"testing") var (instance * int lock sync.Mutexfunc getInstance () * int {if instance = = nil {lock.Lock () defer lock.Unlock () if instance = = nil {I: = 1 instance = & I}} return instance} / / for the following benchmark Try func BenchmarkSprintf (b * testing.B) {for iRanger 0 I

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