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use super::{current_task, TaskControlBlock};
use alloc::collections::VecDeque;
use alloc::sync::Arc;
use alloc::vec::Vec;
use lazy_static::*;
use spin::Mutex;
pub struct TaskManager {
ready_queue: VecDeque<Arc<TaskControlBlock>>,
interruptible_queue: VecDeque<Arc<TaskControlBlock>>,
}
impl TaskManager {
pub fn new() -> Self {
Self {
ready_queue: VecDeque::new(),
interruptible_queue: VecDeque::new(),
}
}
pub fn add(&mut self, task: Arc<TaskControlBlock>) {
self.ready_queue.push_back(task);
}
pub fn fetch(&mut self) -> Option<Arc<TaskControlBlock>> {
self.ready_queue.pop_front()
}
pub fn add_interruptible(&mut self, task: Arc<TaskControlBlock>) {
self.interruptible_queue.push_back(task);
}
pub fn drop_interruptible(&mut self, task: Arc<TaskControlBlock>) {
self.interruptible_queue
.retain(|task_in_queue| Arc::as_ptr(task_in_queue) != Arc::as_ptr(&task));
}
pub fn find_by_pid(&self, pid: usize) -> Option<Arc<TaskControlBlock>> {
self.ready_queue
.iter()
.chain(self.interruptible_queue.iter())
.find(|task| task.pid.0 == pid)
.cloned()
}
pub fn ready_count(&self) -> u16 {
self.ready_queue.len() as u16
}
pub fn interruptible_count(&self) -> u16 {
self.interruptible_queue.len() as u16
}
}
lazy_static! {
pub static ref TASK_MANAGER: Mutex<TaskManager> = Mutex::new(TaskManager::new());
}
pub fn add_task(task: Arc<TaskControlBlock>) {
TASK_MANAGER.lock().add(task);
}
pub fn fetch_task() -> Option<Arc<TaskControlBlock>> {
TASK_MANAGER.lock().fetch()
}
pub fn sleep_interruptible(task: Arc<TaskControlBlock>) {
TASK_MANAGER.lock().add_interruptible(task);
}
pub fn wake_interruptible(task: Arc<TaskControlBlock>) {
let mut manager = TASK_MANAGER.lock();
manager.drop_interruptible(task.clone());
manager.add(task.clone());
}
pub fn find_task_by_pid(pid: usize) -> Option<Arc<TaskControlBlock>> {
let task = current_task().unwrap();
if task.pid.0 == pid {
Some(task)
} else {
TASK_MANAGER.lock().find_by_pid(pid)
}
}
pub fn procs_count() -> u16 {
let manager = TASK_MANAGER.lock();
manager.ready_count() + manager.interruptible_count()
}
pub struct WaitQueue {
inner: Mutex<Vec<Arc<TaskControlBlock>>>,
}
impl WaitQueue {
pub fn add_task(&mut self, task: Arc<TaskControlBlock>) {
self.inner.lock().push(task);
}
pub fn wake_all(&mut self) {
let mut vec = self.inner.lock();
vec.iter().for_each(|task| {
wake_interruptible(task.clone());
task.acquire_inner_lock().task_status = super::task::TaskStatus::Ready;
});
vec.clear();
}
}