Thank you for your advice, this is my first time to ask a question there.
在 2018年3月13日星期二 UTC+8下午11:00:46，Jake Montgomery写道：
>
> I would like to point out that the example code you refer to is meant to
> illustrate a specific behavior of locks. It is *not* necessarily intended
> to be an example of good style. As a "new gopher" I would avoid this idiom.
> If you did use this, some significant commenting would be needed.
>
> Also, what blog post are you referring to?
>
> - Jake
>
> On Tuesday, March 13, 2018 at 9:27:08 AM UTC-4, 郎凯 wrote:
>>
>> var l sync.Mutex
>> var a string
>>
>> func f() {
>> a = "hello, world"
>> l.Unlock()
>> }
>>
>> func main() {
>> l.Lock()
>> go f()
>> l.Lock()
>> print(a)
>> }
>>
>> I'm a new gopher, reading a blog about lock and having a problem, in
>> general , we use sync.Mutex in pairs, in the above code why could it call
>> lock two times in main.
>> Any help is Appreciated.
>> Thanks in advanced.
>>
>
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