Исходники и презентации

lessons/channels/nil_channel/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+)
+
+// Need to show solution
+
+func WaitToClose(lhs, rhs chan struct{}) {
+	lhsClosed, rhsClosed := false, false
+	for !lhsClosed || !rhsClosed {
+		select {
+		case _, ok := <-lhs:
+			fmt.Println("lhs", ok)
+			if !ok {
+				lhsClosed = true
+			}
+		case _, ok := <-rhs:
+			fmt.Println("rhs", ok)
+			if !ok {
+				rhsClosed = true
+			}
+		}
+	}
+}
+
+func main() {
+	lhs := make(chan struct{}, 1)
+	rhs := make(chan struct{}, 1)
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+
+	go func() {
+		defer wg.Done()
+		WaitToClose(lhs, rhs)
+	}()
+
+	lhs <- struct{}{}
+	rhs <- struct{}{}
+
+	close(lhs)
+	close(rhs)
+
+	wg.Wait()
+}