Go question bank · 14 the pit of waitgroup

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「 title 」GOLANG ROADMAP Community

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「 answer 」（engine）

① Add A negative number

If the value of the counter is less than 0 Will directly panic

② Add stay Wait Then call

For example, some subprocesses call at the beginning Add End call Wait, these Wait Unable to block the subprocess . The correct way to do this is to start the subprocess Add A specific value .

③ Not set as 0 Just reuse it

WaitGroup You can complete a choreography task , The count value drops to 0 Can continue to be used by other tasks , But don't use it for other tasks before you finish using it , So with the count value , There's probably something wrong with it .

④ Copy waitgroup

WaitGroup Yes nocopy Field , Can't be copied . Also means that WaitGroup Cannot be used as an argument to a function .