Update task public APIs.

os/src/syscall/process.rs

@@ -1,18 +1,15 @@
 use crate::task::{
-    mark_current_suspended,
-    mark_current_exited,
-    run_next_task
+    suspend_current_and_run_next,
+    exit_current_and_run_next,
 };
 
 pub fn sys_exit(exit_code: i32) -> ! {
     println!("[kernel] Application exited with code {}", exit_code);
-    mark_current_exited();
-    run_next_task();
+    exit_current_and_run_next();
     panic!("Unreachable in sys_exit!");
 }
 
 pub fn sys_yield() -> isize {
-    mark_current_suspended();
-    run_next_task();
+    suspend_current_and_run_next();
     0
 }

os/src/task/mod.rs

@@ -103,14 +103,24 @@ pub fn run_first_task() {
     TASK_MANAGER.run_first_task();
 }
 
-pub fn run_next_task() {
+fn run_next_task() {
     TASK_MANAGER.run_next_task();
 }
 
-pub fn mark_current_suspended() {
+fn mark_current_suspended() {
     TASK_MANAGER.mark_current_suspended();
 }
 
-pub fn mark_current_exited() {
+fn mark_current_exited() {
     TASK_MANAGER.mark_current_exited();
+}
+
+pub fn suspend_current_and_run_next() {
+    mark_current_suspended();
+    run_next_task();
+}
+
+pub fn exit_current_and_run_next() {
+    mark_current_exited();
+    run_next_task();
 }