On Friday, February 16, 2018 at 3:27:04 PM UTC+2, dc0d wrote:
>
> Why sync.Once uses a sync.Mutex in addition to atomic functions?
>
> What are the drawbacks/shortcomings/deficiencies of this implementation?
>
> type Once struct {
> done uint32
> }
>
>
> func (o *Once) Do(f func()) {
> if !atomic.CompareAndSwapUint32(&o.done, 0, 1) {
> return
> }
> f()
> }
>
>
You implementation returns immediately, if f() is still running, while in
original implementation all concurrent calls to Do() returns when f()
return.
Djadala
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