Implement many process syscalls.

os/src/task/manager.rs

@@ -5,7 +5,7 @@ use spin::Mutex;
 use lazy_static::*;
 
 pub struct TaskManager {
-    ready_queue: VecDeque<Arc<Mutex<TaskControlBlock>>>,
+    ready_queue: VecDeque<Arc<TaskControlBlock>>,
 }
 
 /// A simple FIFO scheduler.
@@ -13,10 +13,10 @@ impl TaskManager {
     pub fn new() -> Self {
         Self { ready_queue: VecDeque::new(), }
     }
-    pub fn add(&mut self, task: Arc<Mutex<TaskControlBlock>>) {
+    pub fn add(&mut self, task: Arc<TaskControlBlock>) {
         self.ready_queue.push_back(task);
     }
-    pub fn fetch(&mut self) -> Option<Arc<Mutex<TaskControlBlock>>> {
+    pub fn fetch(&mut self) -> Option<Arc<TaskControlBlock>> {
         self.ready_queue.pop_front()
     }
 }
@@ -25,10 +25,10 @@ lazy_static! {
     pub static ref TASK_MANAGER: Mutex<TaskManager> = Mutex::new(TaskManager::new());
 }
 
-pub fn add_task(task: Arc<Mutex<TaskControlBlock>>) {
+pub fn add_task(task: Arc<TaskControlBlock>) {
     TASK_MANAGER.lock().add(task);
 }
 
-pub fn fetch_task() -> Option<Arc<Mutex<TaskControlBlock>>> {
+pub fn fetch_task() -> Option<Arc<TaskControlBlock>> {
     TASK_MANAGER.lock().fetch()
 }