Rativel/BurritOS
1
1
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

♻️ Clean-up of some nasty nesting in sem_v and sem_p

Browse Source
This commit is contained in:
François Autin 2023-04-19 23:24:51 +02:00
parent 5734e02b30
commit 8b13cc6ef6
No known key found for this signature in database
GPG Key ID: 343F5D382E1DD77C
1 changed files with 38 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
src/kernel/thread_manager.rs
View File

@ -69,26 +69,22 @@ impl ThreadManager {
///
/// **next_thread** thread to dispatch to the CPU
pub fn switch_to(&mut self, machine: &mut Machine, next_thread: Rc<RefCell<Thread>>) {
match self.get_g_current_thread() {
Some(old) => {
let old1 = Rc::clone(old);
let old2 = Rc::clone(old);
self.thread_save_processor_state(machine, old1);
if let Some(old_thread) = self.get_g_current_thread() {
let old_thread = old_thread.clone();
self.thread_save_processor_state(machine, old_thread.clone());
// old_thread.save_simulator_state();
if old2 != next_thread {
self.debug(format!("switching from \"{}\" to \"{}\"", old2.borrow().get_name(), next_thread.borrow().get_name()));
if old_thread != next_thread {
self.debug(format!("switching from \"{}\" to \"{}\"", old_thread.borrow().get_name(), next_thread.borrow().get_name()));
self.thread_restore_processor_state(machine, Rc::clone(&next_thread));
// next_thread.restore_simulator_state();
debug_assert!(!self.ready_list.contains(&next_thread));
self.set_g_current_thread(Some(next_thread));
}
},
None => {
} else {
self.thread_restore_processor_state(machine, Rc::clone(&next_thread));
// next_thread.restore_simulator_state();
self.set_g_current_thread(Some(next_thread));
}
}
if let Some(th) = self.get_g_thread_to_be_destroyed() {
drop(th);
@ -123,7 +119,6 @@ impl ThreadManager {
pub fn thread_yield(&mut self, machine: &mut Machine, thread: Rc<RefCell<Thread>>) {
let old_status = machine.interrupt.set_status(crate::simulator::interrupt::InterruptStatus::InterruptOff);
self.debug(format!("Yeilding thread: {}", thread.borrow().get_name()));
debug_assert_eq!(&Option::Some(Rc::clone(&thread)), self.get_g_current_thread());
let next_thread = self.find_next_to_run();
@ -192,26 +187,22 @@ impl ThreadManager {
/// - *id_sema* id of the semaphore, stored in [`ObjAddr`], id given by user program thought exceptions
/// - *machine* Current state of the machine
pub fn sem_p(&mut self, id_sema: i32, machine: &mut Machine) -> Result<MachineOk, MachineError> {
match self.get_g_current_thread() {
Some(thread) => {
let rc1_thread = Rc::clone(thread);
let rc2_thread = Rc::clone(thread);
let sema = self.get_obj_addrs().search_semaphore(id_sema as i32);
if let Some(sema) = sema {
let old_status = machine.interrupt.set_status(InterruptStatus::InterruptOff);
let thread = match self.get_g_current_thread() {
Some(thread) => Rc::clone(thread),
None => Err("sem_p error: current thread should not be None")?
};
let sema = match self.get_obj_addrs().search_semaphore(id_sema) {
Some(sema) => sema,
None => Err("sem_p error: cannot find semaphore")?
};
sema.counter -= 1;
if sema.counter < 0 {
sema.waiting_queue.push(rc1_thread);
self.thread_sleep(machine, rc2_thread);
sema.waiting_queue.push(thread.clone());
self.thread_sleep(machine, thread);
}
machine.interrupt.set_status(old_status);
Ok(MachineOk::Ok)
} else {
Err("Cannot find semaphore")?
}
},
None => unreachable!("Current thread should not be None")
}
}
/// Increment semaphore value, waking up a waiting thread if any.
@ -225,9 +216,10 @@ impl ThreadManager {
/// - *id_sema* id of the semaphore, stored in [`ObjAddr`], id given by user program thought exceptions
/// - **machine** the machine where the threads are executed
pub fn sem_v(&mut self, id_sema: i32, machine: &mut Machine) -> Result<MachineOk, MachineError> {
let sema = self.get_obj_addrs().search_semaphore(id_sema as i32);
match sema {
Some(sema) => {
let sema = match self.get_obj_addrs().search_semaphore(id_sema) {
Some(sema) => sema,
None => Err("sem_v error: cannot find semaphore")?
};
let old_status = machine.interrupt.set_status(InterruptStatus::InterruptOff);
sema.counter += 1;
match sema.waiting_queue.pop() {
@ -236,12 +228,6 @@ impl ThreadManager {
}
machine.interrupt.set_status(old_status);
Ok(MachineOk::Ok)
},
None => {
Err("Cannot find semaphore")?
}
}
}