Fix terminate handler to prevent double channel close, up to 0.1.5

close_handler.go

@@ -2,7 +2,7 @@ package grawt
 
 type CloseHandler struct {
 	waiter      *Waiter
-	Quit        chan bool
+	Quit        chan struct{}
 	active      bool
 	autoDone    bool
 	handlerFunc *func()

waiter.go

@@ -17,7 +17,7 @@ type Waiter struct {
 func (w *Waiter) addHandler(f *func(), autoDone bool) *CloseHandler {
 	ch := CloseHandler{
 		w,
-		make(chan bool, 1),
+		make(chan struct{}, 1),
 		true,
 		autoDone,
 		f,
@@ -32,7 +32,9 @@ func (w *Waiter) terminateHandler(h *CloseHandler, forceWaitGroupDone bool) {
 	if h.handlerFunc != nil && *h.handlerFunc != nil {
 		(*h.handlerFunc)()
 	}
-	h.Quit <- true
+	if h.active {
+		close(h.Quit)
+	}
 	if h.autoDone || forceWaitGroupDone {
 		w.waitGroup.Done()
 	}