1# concurrent
2
3[](https://sourcegraph.com/github.com/modern-go/concurrent?badge)
4[](http://godoc.org/github.com/modern-go/concurrent)
5[](https://travis-ci.org/modern-go/concurrent)
6[](https://codecov.io/gh/modern-go/concurrent)
7[](https://goreportcard.com/report/github.com/modern-go/concurrent)
8[](https://raw.githubusercontent.com/modern-go/concurrent/master/LICENSE)
9
10* concurrent.Map: backport sync.Map for go below 1.9
11* concurrent.Executor: goroutine with explicit ownership and cancellable
12
13# concurrent.Map
14
15because sync.Map is only available in go 1.9, we can use concurrent.Map to make code portable
16
17```go
18m := concurrent.NewMap()
19m.Store("hello", "world")
20elem, found := m.Load("hello")
21// elem will be "world"
22// found will be true
23```
24
25# concurrent.Executor
26
27```go
28executor := concurrent.NewUnboundedExecutor()
29executor.Go(func(ctx context.Context) {
30 everyMillisecond := time.NewTicker(time.Millisecond)
31 for {
32 select {
33 case <-ctx.Done():
34 fmt.Println("goroutine exited")
35 return
36 case <-everyMillisecond.C:
37 // do something
38 }
39 }
40})
41time.Sleep(time.Second)
42executor.StopAndWaitForever()
43fmt.Println("executor stopped")
44```
45
46attach goroutine to executor instance, so that we can
47
48* cancel it by stop the executor with Stop/StopAndWait/StopAndWaitForever
49* handle panic by callback: the default behavior will no longer crash your applicationView as plain text