145 lines
No EOL
3.8 KiB
Rust
145 lines
No EOL
3.8 KiB
Rust
mod context;
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mod switch;
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mod task;
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use crate::loader::{get_num_app, get_app_data};
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use crate::trap::TrapContext;
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use crate::sync::UPSafeCell;
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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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use alloc::vec::Vec;
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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: UPSafeCell<TaskManagerInner>,
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}
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struct TaskManagerInner {
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tasks: Vec<TaskControlBlock>,
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current_task: usize,
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}
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lazy_static! {
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pub static ref TASK_MANAGER: TaskManager = {
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println!("init TASK_MANAGER");
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let num_app = get_num_app();
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println!("num_app = {}", num_app);
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let mut tasks: Vec<TaskControlBlock> = Vec::new();
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for i in 0..num_app {
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tasks.push(TaskControlBlock::new(
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get_app_data(i),
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i,
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));
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}
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TaskManager {
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num_app,
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inner: unsafe { UPSafeCell::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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let next_task = &mut self.inner.upsafe_access().tasks[0];
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next_task.task_status = TaskStatus::Running;
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let next_task_cx_ptr = &next_task.task_cx as *const TaskContext;
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drop(next_task);
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let mut _unused = TaskContext::zero_init();
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unsafe {
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__switch(
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&mut _unused as *mut _,
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next_task_cx_ptr,
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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 inner = self.inner.upsafe_access();
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inner.tasks[inner.current_task].task_status = TaskStatus::Ready;
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}
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fn mark_current_exited(&self) {
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let inner = self.inner.upsafe_access();
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inner.tasks[inner.current_task].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.upsafe_access();
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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 get_current_token(&self) -> usize {
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let inner = self.inner.upsafe_access();
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inner.tasks[inner.current_task].get_user_token()
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}
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fn get_current_trap_cx(&self) -> &mut TrapContext {
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let inner = self.inner.upsafe_access();
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inner.tasks[inner.current_task].get_trap_cx()
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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.upsafe_access();
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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_ptr = &mut inner.tasks[current].task_cx as *mut TaskContext;
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let next_task_cx_ptr = &inner.tasks[next].task_cx as *const TaskContext;
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drop(inner);
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unsafe {
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__switch(
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current_task_cx_ptr,
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next_task_cx_ptr,
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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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}
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pub fn current_user_token() -> usize {
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TASK_MANAGER.get_current_token()
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}
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pub fn current_trap_cx() -> &'static mut TrapContext {
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TASK_MANAGER.get_current_trap_cx()
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} |