Golang Worker.Kill方法代码示例

// add starts two goroutines that (1) kill the catacomb's tomb with any
// error encountered by the worker; and (2) kill the worker when the
// catacomb starts dying.
func (catacomb *Catacomb) add(w worker.Worker) {

	// The coordination via stopped is not reliably observable, and hence not
	// tested, but it's yucky to leave the second goroutine running when we
	// don't need to.
	stopped := make(chan struct{})
	catacomb.wg.Add(1)
	go func() {
		defer catacomb.wg.Done()
		defer close(stopped)
		if err := w.Wait(); err != nil {
			catacomb.Kill(err)
		}
	}()
	go func() {
		select {
		case <-stopped:
		case <-catacomb.tomb.Dying():
			w.Kill()
		}
	}()
}

// gotStarted updates the engine to reflect the creation of a worker. It must
// only be called from the loop goroutine.
func (engine *engine) gotStarted(name string, worker worker.Worker) {
	// Copy current info; check preconditions and abort the workers if we've
	// already been asked to stop it.
	info := engine.current[name]
	switch {
	case info.worker != nil:
		engine.tomb.Kill(errors.Errorf("fatal: unexpected %q manifold worker start", name))
		fallthrough
	case info.stopping, engine.isDying():
		logger.Debugf("%q manifold worker no longer required", name)
		worker.Kill()
	default:
		// It's fine to use this worker; update info and copy back.
		logger.Infof("%q manifold worker started", name)
		info.starting = false
		info.worker = worker
		engine.current[name] = info

		// Any manifold that declares this one as an input needs to be restarted.
		engine.bounceDependents(name)
	}
}

func stopWorker(w worker.Worker) error {
	w.Kill()
	return w.Wait()
}

// CheckKill Kill()s the supplied worker and Wait()s for its error, which it
// returns for further analysis, or fails the test after a timeout expires.
// It doesn't Assert and is therefore suitable for use from any goroutine.
func CheckKill(c *gc.C, w worker.Worker) error {
	w.Kill()
	return CheckKilled(c, w)
}

func kill(w worker.Worker) error {
	w.Kill()
	return w.Wait()
}