scheduler done

This commit is contained in:
Quentin Legot 2023-03-01 10:11:19 +01:00 committed by François Autin
parent adce79aaa8
commit e3e217c57f
No known key found for this signature in database
GPG Key ID: 343F5D382E1DD77C
3 changed files with 49 additions and 4 deletions

View File

@ -1,3 +1,3 @@
mod process;
mod thread;
pub mod thread;
mod scheduler;

View File

@ -1,10 +1,11 @@
use crate::utility::list::List;
use crate::kernel::thread::Thread;
use crate::utility::system::{g_current_thread, g_thread_to_be_destroyed};
use std::rc::Rc;
struct Scheduler<> {
ready_list: List<Rc<Thread>>
ready_list: List<Thread>
}
impl Scheduler {
@ -24,9 +25,48 @@ impl Scheduler {
///
/// ## Pamameter
///
/// **thread**: Thread is the thread to be put on the read list
pub fn ready_to_run(&mut self, thread: Rc<Thread>) {
/// **thread** is the thread to be put on the read list
pub fn ready_to_run(&mut self, thread: Thread) {
self.ready_list.push_back(thread);
}
/// Return the next thread to be scheduled onto the CPU.
/// If there are no ready threads, return Option::None
///
/// Thread is removed from the ready list.
///
/// **return** Thread thread to be scheduled
pub fn find_next_to_run(&mut self) -> Option<Thread> {
self.ready_list.pop_back()
}
/// Dispatch the CPU to next_thread. Save the state of the old thread
/// and load the state of the new thread.
///
/// We assume the state of the previously running thread has already been changed from running to blocked or ready.
///
/// Global variable g_current_thread become next_thread
///
/// ## Parameter
///
/// **next_thread** thread to dispatch to the CPU
pub fn switch_to(&self, next_thread: Thread) {
let old_thread = Box::clone(&g_current_thread).unwrap();
g_current_thread.check_overflow();
g_current_thread = Box::new(Option::Some(next_thread));
old_thread.save_processor_state();
old_thread.save_simulator_state();
if(old_thread != g_current_thread) {
next_thread.restore_processor_state();
next_thread.restore_simulator_state();
}
if(g_thread_to_be_destroyed.is_some()) {
drop(g_thread_to_be_destroyed.take());
}
}
}

View File

@ -1,3 +1,8 @@
use crate::kernel::thread::Thread;
pub static g_current_thread: Box<Option<Thread>> = Box::new(Option::None);
pub static g_thread_to_be_destroyed: Box<Option<Thread>> = Box::new(Option::None);
pub enum ObjectType {
SEMAPHORE_TYPE,