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35 lines
536 B
Go
35 lines
536 B
Go
package main
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import (
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"fmt"
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"sync"
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"time"
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"github.com/tal-tech/go-zero/core/stringx"
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"github.com/tal-tech/go-zero/core/syncx"
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)
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func main() {
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const round = 5
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var wg sync.WaitGroup
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barrier := syncx.NewSharedCalls()
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wg.Add(round)
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for i := 0; i < round; i++ {
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go func() {
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defer wg.Done()
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val, err := barrier.Do("once", func() (interface{}, error) {
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time.Sleep(time.Second)
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return stringx.RandId(), nil
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})
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if err != nil {
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fmt.Println(err)
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} else {
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fmt.Println(val)
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}
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}()
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}
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wg.Wait()
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}
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