127 lines
No EOL
3.3 KiB
Rust
127 lines
No EOL
3.3 KiB
Rust
mod context;
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mod switch;
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mod task;
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use crate::config::MAX_APP_NUM;
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use crate::loader::{get_num_app, init_app_cx};
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use core::cell::RefCell;
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use lazy_static::*;
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use switch::__switch;
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use task::{TaskControlBlock, TaskStatus};
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pub use context::TaskContext;
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pub struct TaskManager {
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num_app: usize,
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inner: RefCell<TaskManagerInner>,
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}
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struct TaskManagerInner {
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tasks: [TaskControlBlock; MAX_APP_NUM],
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current_task: usize,
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}
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unsafe impl Sync for TaskManager {}
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lazy_static! {
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pub static ref TASK_MANAGER: TaskManager = {
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let num_app = get_num_app();
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let mut tasks = [
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TaskControlBlock { task_cx_ptr: 0, task_status: TaskStatus::UnInit };
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MAX_APP_NUM
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];
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for i in 0..num_app {
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tasks[i].task_cx_ptr = init_app_cx(i) as * const _ as usize;
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tasks[i].task_status = TaskStatus::Ready;
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}
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TaskManager {
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num_app,
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inner: RefCell::new(TaskManagerInner {
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tasks,
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current_task: 0,
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}),
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}
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};
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}
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impl TaskManager {
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fn run_first_task(&self) {
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self.inner.borrow_mut().tasks[0].task_status = TaskStatus::Running;
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let next_task_cx_ptr2 = self.inner.borrow().tasks[0].get_task_cx_ptr2();
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let _unused: usize = 0;
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unsafe {
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__switch(
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&_unused as *const _,
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next_task_cx_ptr2,
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);
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}
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}
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fn mark_current_suspended(&self) {
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let mut inner = self.inner.borrow_mut();
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let current = inner.current_task;
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inner.tasks[current].task_status = TaskStatus::Ready;
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}
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fn mark_current_exited(&self) {
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let mut inner = self.inner.borrow_mut();
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let current = inner.current_task;
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inner.tasks[current].task_status = TaskStatus::Exited;
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}
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fn find_next_task(&self) -> Option<usize> {
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let inner = self.inner.borrow();
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let current = inner.current_task;
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(current + 1..current + self.num_app + 1)
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.map(|id| id % self.num_app)
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.find(|id| {
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inner.tasks[*id].task_status == TaskStatus::Ready
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})
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}
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fn run_next_task(&self) {
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if let Some(next) = self.find_next_task() {
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let mut inner = self.inner.borrow_mut();
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let current = inner.current_task;
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inner.tasks[next].task_status = TaskStatus::Running;
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inner.current_task = next;
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let current_task_cx_ptr2 = inner.tasks[current].get_task_cx_ptr2();
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let next_task_cx_ptr2 = inner.tasks[next].get_task_cx_ptr2();
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core::mem::drop(inner);
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unsafe {
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__switch(
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current_task_cx_ptr2,
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next_task_cx_ptr2,
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);
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}
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} else {
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panic!("All applications completed!");
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}
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}
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}
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pub fn run_first_task() {
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TASK_MANAGER.run_first_task();
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}
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fn run_next_task() {
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TASK_MANAGER.run_next_task();
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}
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fn mark_current_suspended() {
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TASK_MANAGER.mark_current_suspended();
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}
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fn mark_current_exited() {
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TASK_MANAGER.mark_current_exited();
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}
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pub fn suspend_current_and_run_next() {
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mark_current_suspended();
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run_next_task();
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}
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pub fn exit_current_and_run_next() {
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mark_current_exited();
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run_next_task();
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} |