Add MainRunnable interface for locking to the main thread

phases.go

@@ -228,6 +228,41 @@ func (this *environment) phase60Initialization() bool {
 }
 
 func (this *environment) phase70Running() bool {
+	for actor := range this.All() {
+		if actor, ok := actor.(MainRunnable); ok {
+			this.main = actor
+		}
+	}
+	
+	result := make(chan bool)
+	go func() {
+		result <- this.phase70RunningBody()
+		if this.main != nil {
+			shutdownCtx, done := context.WithTimeout(
+				context.Background(),
+					defaul(this.timing.shutdownTimeout.Load(),
+					defaultShutdownTimeout))
+			defer done()
+			this.main.ShutdownMain(shutdownCtx)
+		}
+	}()
+
+	if this.main != nil {
+		mainActor := this.main.(Actor)
+		if this.Verb() { log.Printf("(i) (70) binding %s to main thread", mainActor.Type()) }
+		runtime.LockOSThread()
+		defer runtime.UnlockOSThread()
+		err := this.main.RunMain()
+		if err != nil {
+			log.Printf("XXX [%s] main thread failed: %v", mainActor.Type(), err)
+		}
+		if this.Verb() { log.Printf("(i) (70) main thread exited") }
+	}
+	
+	return <- result
+}
+
+func (this *environment) phase70RunningBody() bool {
 	defer this.Done(nil)
 	if this.Verb() { log.Println("... (70) starting up") }
 	this.running.Store(true)