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49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
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# concurrent
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[](https://sourcegraph.com/github.com/modern-go/concurrent?badge)
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[](http://godoc.org/github.com/modern-go/concurrent)
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[](https://travis-ci.org/modern-go/concurrent)
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[](https://codecov.io/gh/modern-go/concurrent)
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[](https://goreportcard.com/report/github.com/modern-go/concurrent)
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[](https://raw.githubusercontent.com/modern-go/concurrent/master/LICENSE)
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* concurrent.Map: backport sync.Map for go below 1.9
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* concurrent.Executor: goroutine with explicit ownership and cancellable
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# concurrent.Map
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because sync.Map is only available in go 1.9, we can use concurrent.Map to make code portable
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```go
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m := concurrent.NewMap()
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m.Store("hello", "world")
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elem, found := m.Load("hello")
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// elem will be "world"
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// found will be true
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```
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# concurrent.Executor
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```go
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executor := concurrent.NewUnboundedExecutor()
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executor.Go(func(ctx context.Context) {
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everyMillisecond := time.NewTicker(time.Millisecond)
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for {
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select {
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case <-ctx.Done():
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fmt.Println("goroutine exited")
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return
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case <-everyMillisecond.C:
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// do something
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}
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}
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})
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time.Sleep(time.Second)
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executor.StopAndWaitForever()
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fmt.Println("executor stopped")
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```
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attach goroutine to executor instance, so that we can
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* cancel it by stop the executor with Stop/StopAndWait/StopAndWaitForever
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* handle panic by callback: the default behavior will no longer crash your application
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