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  # concurrent
  
  [![Sourcegraph](https://sourcegraph.com/github.com/modern-go/concurrent/-/badge.svg)](https://sourcegraph.com/github.com/modern-go/concurrent?badge)
  [![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/modern-go/concurrent)
  [![Build Status](https://travis-ci.org/modern-go/concurrent.svg?branch=master)](https://travis-ci.org/modern-go/concurrent)
  [![codecov](https://codecov.io/gh/modern-go/concurrent/branch/master/graph/badge.svg)](https://codecov.io/gh/modern-go/concurrent)
  [![rcard](https://goreportcard.com/badge/github.com/modern-go/concurrent)](https://goreportcard.com/report/github.com/modern-go/concurrent)
  [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://raw.githubusercontent.com/modern-go/concurrent/master/LICENSE)
  
  * concurrent.Map: backport sync.Map for go below 1.9
  * concurrent.Executor: goroutine with explicit ownership and cancellable
  
  # concurrent.Map
  
  because sync.Map is only available in go 1.9, we can use concurrent.Map to make code portable
  
  ```go
  m := concurrent.NewMap()
  m.Store("hello", "world")
  elem, found := m.Load("hello")
  // elem will be "world"
  // found will be true
  ```
  
  # concurrent.Executor
  
  ```go
  executor := concurrent.NewUnboundedExecutor()
  executor.Go(func(ctx context.Context) {
      everyMillisecond := time.NewTicker(time.Millisecond)
      for {
          select {
          case <-ctx.Done():
              fmt.Println("goroutine exited")
              return
          case <-everyMillisecond.C:
              // do something
          }
      }
  })
  time.Sleep(time.Second)
  executor.StopAndWaitForever()
  fmt.Println("executor stopped")
  ```
  
  attach goroutine to executor instance, so that we can
  
  * cancel it by stop the executor with Stop/StopAndWait/StopAndWaitForever
  * handle panic by callback: the default behavior will no longer crash your application