fix: potential endless loop (changkun#22)

krsfrodaslz · changkun · commit ec3e0e65ba11 · 2018-04-18T15:02:50.000+02:00
* fix potential endless loop

* update code as well
diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md
@@ -153,6 +153,7 @@ int main()
         cond_var.notify_one();
     }
     done = true;
+    notified = true;
     cond_var.notify_one();
 });
 
diff --git a/code/7/7.2.cpp b/code/7/7.2.cpp
@@ -39,6 +39,7 @@ int main()
             cond_var.notify_one();
         }
         done = true;
+        notified = true;
         cond_var.notify_one();
     });
     // 消费者线程
