add sys_wait impl

Author: 刘丰源

SUMMARY.md

@@ -71,7 +71,7 @@
   - [2. 物理内存管理](./exercise/part2.md)
   - [3. 虚拟内存管理](./exercise/part3.md)
   - [4. 线程管理](./exercise/part4.md)
-  - [5. 线程调度（TODO）](./exercise/part5.md)
+  - [5. 线程调度](./exercise/part5.md)
   - [6. 用户进程（+ 虚拟内存管理 + 线程管理）](./exercise/part6.md)
   - [7. 同步互斥（TODO）](./exercise/part7.md)
   - [8. 文件系统](./exercise/part8.md)

docs/appendix/inline_asm.html

@@ -1031,7 +1031,7 @@
                 <a href="../exercise/part5.html">
 
 
-                    5. 线程调度（TODO）
+                    5. 线程调度
 
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docs/appendix/install_rust.html

@@ -1029,7 +1029,7 @@
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-                    5. 线程调度（TODO）
+                    5. 线程调度
 
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docs/appendix/introduction.html

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+                    5. 线程调度
 
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docs/chapter0/introduction.html

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