add(post) 2 vim pages

Signed-off-by: scutKKsix <1129332011@qq.com>

Author: oeasy1412

src/content/posts/OS/coroutine.md

@@ -119,6 +119,17 @@ struct AsyncTask {
         }
     }
 };
+
+struct suspend_always {
+    constexpr bool await_ready() const noexcept { return false; }
+    constexpr void await_suspend(coroutine_handle<>) const noexcept {}
+    constexpr void await_resume() const noexcept {}
+};
+struct suspend_never { 
+    constexpr bool await_ready() const noexcept { return true; }
+    constexpr void await_suspend(coroutine_handle<>) const noexcept {}
+    constexpr void await_resume() const noexcept {}
+};
 ```
 
 ### **挂起的艺术：Awaitable 对象与 `co_await`**