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https://github.com/panpaul/tiny_os
synced 2024-09-20 01:35:19 +08:00
fix: scheduler: head node will never be scheduled, add a dummy head node
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@ -1,4 +1,4 @@
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pub const TIMER_TICKS: u64 = 100_000; // 100ms
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pub const TIMER_TICKS: u64 = 100_000;
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// devices
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pub const UART0_BASE: usize = 0x1000_0000;
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@ -2,7 +2,7 @@ use crate::plat::console::{set_console, ConsoleDevice, ConsoleDriver, CONSOLE};
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use crate::plat::lowlevel::{Hardware, LowLevel};
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use crate::plat::timer::{Timer, TimerOps};
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use crate::plat::trap::{Trap, TrapOps};
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use crate::scheduler::SCHEDULER;
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use crate::scheduler::{IDLE_THREAD, SCHEDULER};
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use core::cell::Cell;
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use core::sync::atomic::{AtomicUsize, Ordering};
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use fdt::Fdt;
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@ -35,6 +35,9 @@ pub fn rust_main() -> ! {
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Trap::init();
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Timer::init();
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SCHEDULER.init();
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SCHEDULER.add(&IDLE_THREAD);
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SCHEDULER.schedule();
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loop {
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@ -1,18 +1,18 @@
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use crate::objects::*;
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use core::ptr::NonNull;
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use log::{error, trace};
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use log::error;
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use spin::lazy::Lazy;
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use utils::linked_list::Link;
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use utils::{container_of, linked_list::Link};
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#[thread_local]
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static IDLE_THREAD: Lazy<TcbObject> = Lazy::new(|| {
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pub static IDLE_THREAD: Lazy<TcbObject> = Lazy::new(|| {
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let mut idle_thread = TcbObject::new();
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idle_thread.configure_idle_thread();
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idle_thread
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});
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#[thread_local]
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pub static SCHEDULER: Lazy<Scheduler> = Lazy::new(|| Scheduler::new(&IDLE_THREAD));
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pub static SCHEDULER: Scheduler = Scheduler::new();
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// TODO: add a shared buffer to transfer TCB between cores
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@ -24,14 +24,14 @@ pub struct Scheduler {
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}
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impl Scheduler {
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pub fn new(idle_thread: &TcbObject) -> Self {
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// link idle_thread
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idle_thread.link.set_prev(Some(NonNull::from(idle_thread)));
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idle_thread.link.set_next(Some(NonNull::from(idle_thread)));
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pub const fn new() -> Self {
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Self { head: Link::new() }
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}
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Self {
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head: idle_thread.link.clone(),
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}
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pub fn init(&self) {
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let head = unsafe { Some(NonNull::from(&*container_of!(&self.head, TcbObject, link))) };
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self.head.set_next(head);
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self.head.set_prev(head);
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}
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pub fn add(&self, tcb: &TcbObject) {
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@ -41,7 +41,6 @@ impl Scheduler {
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pub fn schedule(&self) {
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while let Some(next) = self.head.next_mut() {
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if next.timetick() > 0 && next.schedulable() {
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trace!("[Scheduler] Switch to {}, tick: {}", next.tid(), next.timetick());
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next.activate();
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} else if next.timetick() == 0 {
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next.set_timetick(TIME_SLICE);
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