add

Author: wolfstudy

happens_before/three.go

@@ -0,0 +1,17 @@
+package main
+
+var c = make(chan int, 10)
+var aaa string
+
+func ff() {
+	aaa = "hello, world"
+	c <- 0
+}
+
+//要让gorutine显示执行的话，使用channel作为同步信号，阻塞
+//The closing of a channel happens before a receive that returns a zero value because the channel is closed.
+func main() {
+	go ff()
+	<-c
+	print(aaa)
+}