95 lines
2.9 KiB
Rust
95 lines
2.9 KiB
Rust
//! Burritos stores a data structure associating object ids with
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//! their references. The ObjAddr struct
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//! allows to maintain this data structure.
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use std::{collections::HashMap, cell::RefCell, rc::Rc};
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use crate::kernel::{synch::{ Semaphore, Lock }, thread::Thread};
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/// Brief Definition of object identifiers:
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///
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/// The struct stores the list of created objects (Semaphore, Lock, ...) and for each of them
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/// associates an object identifier than can be passed to subsequent
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/// system calls on the object.
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///
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/// A method allows to detect of an object corresponding to a given
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/// identifier exists; this is used to check the parameters of system
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/// calls.
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#[derive(PartialEq)]
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pub struct ObjAddr {
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last_id: i32,
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semaphores: HashMap<i32, Semaphore>,
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locks: HashMap<i32, Lock>,
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threads: HashMap<i32, Rc<RefCell<Thread>>>,
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}
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impl ObjAddr {
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/// Initializes and returns a ObjAddr struct
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pub fn init() -> Self {
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Self {
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last_id: 3,
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semaphores: HashMap::<i32, Semaphore>::new(),
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locks: HashMap::<i32, Lock>::new(),
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threads: HashMap::<i32, Rc<RefCell<Thread>>>::new(),
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}
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}
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/// Adds the **obj** Semaphore to self
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pub fn add_semaphore(&mut self, obj: Semaphore) -> i32 {
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self.last_id += 1;
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self.semaphores.insert(self.last_id, obj);
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self.last_id
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}
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/// Adds the **obj** Lock to self
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pub fn add_lock(&mut self, obj: Lock) -> i32 {
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self.last_id += 1;
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self.locks.insert(self.last_id, obj);
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self.last_id
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}
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/// Adds the **obj** Lock to self
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pub fn add_thread(&mut self, obj: Rc<RefCell<Thread>>) -> i32 {
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self.last_id +=1;
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self.threads.insert(self.last_id, obj);
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self.last_id
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}
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/// Searches for a semaphore of id **id** in self
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pub fn search_semaphore(&mut self, id: i32) -> Option<&mut Semaphore> {
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self.semaphores.get_mut(&id)
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}
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/// Searches for a lock of id **id** in self
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pub fn search_lock(&mut self, id:i32) -> Option<&mut Lock> {
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self.locks.get_mut(&id)
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}
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/// Update lock at given id
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pub fn update_lock(&mut self, id: i32, lock: Lock) {
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self.locks.insert(id, lock);
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}
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/// Searches for a lock of id **id** in self
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pub fn search_thread(&mut self, id: i32) -> Option<&Rc<RefCell<Thread>>> {
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self.threads.get(&id)
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}
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/// Removes the object of id **id** from self if it exists
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pub fn remove_semaphore(&mut self, id: i32) -> Option<Semaphore> {
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self.semaphores.remove(&id)
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}
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/// Remove the object of id **id** from self if it exists
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pub fn remove_lock(&mut self, id:i32) -> Option<Lock> {
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self.locks.remove(&id)
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}
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/// Remove the object of id **id** from self if it exists
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pub fn remove_thread(&mut self, id: i32) -> Option<Rc<RefCell<Thread>>> {
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self.threads.remove(&id)
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}
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} |