try to implement join

src/kernel/exception.rs

@@ -278,7 +278,7 @@ fn sc_new_thread(machine: &mut Machine, system: &mut System) -> Result<MachineOk
     };
     let current_thread = current_thread.borrow_mut();
     if let Some(process) = current_thread.get_process_owner() {
-        system.get_thread_manager().start_thread(n_thread, Rc::clone(&process), func as u64, current_thread.thread_context.int_registers[2] as u64, args);
+        system.get_thread_manager().start_thread(n_thread, Rc::clone(&process), func as u64, current_thread.thread_context.int_registers[2] as u64 + machine.page_size, args);
         // TODO changé la valeur de sp quand on supportera les addresses virtuels
         machine.write_int_register(10, tid as i64);
         Ok(MachineOk::Ok)
@@ -319,7 +319,6 @@ fn get_length_param(addr: usize, machine: & Machine) -> usize {
         i += 1;
 
     }
-    println!("addr: {:x}, i: {}", addr, i + 1);
     i + 1
 }
 
@@ -334,7 +333,6 @@ fn get_string_param(addr: usize, maxlen: usize, machine: &Machine) -> Vec<char>
         dest.push(c as char);
         i += 1;
     }
-    dest.push('\0');
 
     dest
 }

src/kernel/thread.rs

@@ -1,7 +1,7 @@
 use std::{rc::Rc, cell::RefCell};
 
-use super::process::Process;
-use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS, STACK_REG}};
+use super::{process::Process, thread_manager::ThreadRef};
+use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS, STACK_REG}, utility::list::List};
 
 const STACK_FENCEPOST: u32 = 0xdeadbeef;
 
@@ -26,7 +26,7 @@ pub struct Thread {
     name: String,
     pub process: Option<Rc<RefCell<Process>>>,
     pub thread_context: ThreadContext,
-    pub stack_pointer: i32,
+    pub join_thread: List<ThreadRef>,
 }
 
 impl Thread {
@@ -40,9 +40,9 @@ impl Thread {
             thread_context: ThreadContext { 
                 int_registers: [0; NUM_INT_REGS], 
                 float_registers: [0f32; NUM_FP_REGS], 
-                pc: 0 
+                pc: 0,
             },
-            stack_pointer: 0,
+            join_thread: List::default(),
         }
     }
 
@@ -94,7 +94,6 @@ mod test {
                 float_registers: [0f32; NUM_FP_REGS], 
                 pc: 0 
             };
-            x.stack_pointer = 0;
             x }
         };
     }

src/kernel/thread_manager.rs

@@ -102,7 +102,7 @@ use crate::{
 };
 
 /// Using this type alias to simplify struct and method definitions
-type ThreadRef = Rc<RefCell<Thread>>;
+pub type ThreadRef = Rc<RefCell<Thread>>;
 
 /// # Thread manager
 /// 
@@ -186,6 +186,8 @@ impl ThreadManager {
 
     /// Start a thread, attaching it to a process
     pub fn start_thread(&mut self, thread: ThreadRef, owner: Rc<RefCell<Process>>, func_pc: u64, sp_loc: u64, argument: i64) {
+        self.debug(format!("starting thread \"{}\"", thread.borrow().get_name()));
+
         let mut thread_m = thread.borrow_mut();
         assert_eq!(thread_m.process, Option::None);
         thread_m.process = Option::Some(Rc::clone(&owner));
@@ -199,23 +201,29 @@ impl ThreadManager {
     /// Wait for another thread to finish its execution
     pub fn thread_join(&mut self, machine: &mut Machine, waiter: ThreadRef, waiting_for: ThreadRef) {
         let waiting_for = Rc::clone(&waiting_for);
-        while self.get_g_alive().contains(&waiting_for) {
-            self.debug(format!("Joining \"{}\" to \"{}\"", waiter.borrow().get_name(), waiting_for.borrow().get_name()));
-            self.thread_yield(machine, Rc::clone(&waiter));
+        if self.get_g_alive().contains(&waiting_for) {
+            waiting_for.borrow_mut().join_thread.push(Rc::clone(&waiter));
+            self.thread_yield(machine, Rc::clone(&waiter), false);
         }
     }
 
     /// Relinquish the CPU if any other thread is runnable.
     /// 
     /// Cannot use yield as a function name -> reserved name in rust
-    pub fn thread_yield(&mut self, machine: &mut Machine, thread: ThreadRef) {
+    /// 
+    /// ## Parameters
+    /// 
+    /// **is_ready** true if **thread** should be readded to ready_to_run list, false otherwise. Typically false when joining per example
+    pub fn thread_yield(&mut self, machine: &mut Machine, thread: ThreadRef, is_ready: bool) {
         let old_status = machine.interrupt.set_status(crate::simulator::interrupt::InterruptStatus::InterruptOff);
         
-        self.debug(format!("Yeilding thread: {}", thread.borrow().get_name()));
+        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();
         if let Some(next_thread) = next_thread {
+            if is_ready {
                 self.ready_to_run(thread);
+            }
             self.switch_to(machine, next_thread);
         }
         machine.interrupt.set_status(old_status);    
@@ -226,6 +234,7 @@ impl ThreadManager {
         debug_assert_eq!(Option::Some(Rc::clone(&thread)), self.g_current_thread);
         debug_assert_eq!(machine.interrupt.get_status(), InterruptStatus::InterruptOff);
 
+        self.debug(format!("Sleeping thread {}", thread.borrow().get_name()));
         let mut next_thread = self.find_next_to_run();
         while next_thread.is_none() {
             eprintln!("Nobody to run => idle");
@@ -240,8 +249,11 @@ impl ThreadManager {
     pub fn thread_finish(&mut self, machine: &mut Machine, thread: ThreadRef) {
         let old_status = machine.interrupt.set_status(InterruptStatus::InterruptOff);
         assert!(self.g_alive.remove(Rc::clone(&thread)));
-        self.debug(format!("Sleeping thread {}", thread.borrow().get_name()));
+        self.debug(format!("Finishing thread {}", thread.borrow().get_name()));
         // g_objets_addrs->removeObject(self.thread) // a ajouté plus tard
+        for (_, el) in thread.borrow().join_thread.iter().enumerate() {
+            self.ready_to_run(Rc::clone(&el));
+        }
         self.thread_sleep(machine, Rc::clone(&thread));
         machine.interrupt.set_status(old_status);
     }
@@ -432,7 +444,7 @@ mod test {
 
         let owner1 = Process { num_thread: 0 };
         let owner1 = Rc::new(RefCell::new(owner1));
-        system.get_thread_manager().start_thread(Rc::clone(&thread1), owner1, loader.elf_header.entrypoint, ptr, -1);
+        system.get_thread_manager().start_thread(Rc::clone(&thread1), owner1, loader.elf_header.entrypoint, ptr + machine.page_size, -1);
         debug_assert_eq!(thread1.borrow_mut().thread_context.pc, start_pc);
         debug_assert!(system.get_thread_manager().get_g_alive().contains(&Rc::clone(&thread1)));
 

src/main.rs

@@ -20,7 +20,7 @@ use simulator::{machine::Machine, loader};
 
 
 use clap::Parser;
-use utility::cfg::{get_debug_configuration, read_settings};
+use utility::cfg::read_settings;
 
 #[derive(Parser, Debug)]
 #[command(name = "BurritOS", author, version, about = "Burritos (BurritOS Using Rust Really Improves The Operating System)
@@ -29,9 +29,13 @@ Burritos is an educational operating system written in Rust
 running on RISC-V emulator.", long_about = None)]
 /// Launch argument parser
 struct Args {
-    /// Enable debug mode
-    #[arg(short, long)]
-    debug: bool,
+    /// Enable debug mode.
+    /// 0 to disable debug,
+    /// 1 to enable machine debug,
+    /// 2 to enable system debug,
+    /// 3 to enable all debug
+    #[arg(short, long, value_parser = clap::value_parser!(u8).range(0..=3))]
+    debug: u8,
     /// Path to the executable binary file to execute
     #[arg(short = 'x', long, value_name = "PATH")]
     executable: String
@@ -40,10 +44,10 @@ struct Args {
 fn main() {
     let args = Args::parse();
 
-    let mut machine = Machine::new(args.debug, read_settings().unwrap());
+    let mut machine = Machine::new(args.debug & 1 != 0, read_settings().unwrap());
     let (loader, ptr) = loader::Loader::new(args.executable.as_str(), &mut machine, 0).expect("An error occured while parsing the program");
     
-    let mut system = System::new(args.debug);
+    let mut system = System::new(args.debug & 2 != 0);
 
     let thread_exec = Thread::new(args.executable.as_str());
     let thread_exec = Rc::new(RefCell::new(thread_exec));
@@ -51,7 +55,7 @@ fn main() {
 
     let owner1 = Process { num_thread: 0 };
     let owner1 = Rc::new(RefCell::new(owner1));
-    system.get_thread_manager().start_thread(Rc::clone(&thread_exec), owner1, loader.elf_header.entrypoint, ptr, -1);
+    system.get_thread_manager().start_thread(Rc::clone(&thread_exec), owner1, loader.elf_header.entrypoint, ptr + machine.page_size, -1);
     
     let to_run = system.get_thread_manager().find_next_to_run().unwrap();
     system.get_thread_manager().switch_to(&mut machine, Rc::clone(&to_run));

src/simulator/machine.rs

@@ -95,7 +95,7 @@ pub struct Machine {
 	// futur taille à calculer int memSize = g_cfg->NumPhysPages * g_cfg->PageSize;
 	//creer une struct cfg(configuration) qui s'initialise avec valeur dans un fichier cfg
 	num_phy_page: u64,
-	page_size: u64,
+	pub page_size: u64,
 	/// Current machine status
 	pub status: MachineStatus
 }

src/utility/list.rs

@@ -9,11 +9,10 @@ use std::ptr;
 /// These methods wrap unsafe instructions because it doesn't respect borrow rules per example
 /// but everything has been tested with miri to assure there's no Undefined Behaviour (use-after-free, double free, etc.)
 /// or memory leak
-#[derive(PartialEq)]
-#[derive(Clone)]
+#[derive(PartialEq, Clone, Debug)]
 pub struct List<T: PartialEq> {
     head: Link<T>,
-    tail: *mut Node<T>,
+    tail: Link<T>,
 }
 
 type Link<T> = *mut Node<T>;

test/syscall_tests/Makefile

@@ -1,4 +1,4 @@
-PROGRAMS = halt.guac prints.guac producteur_consommateur.guac
+PROGRAMS = halt.guac prints.guac producteur_consommateur.guac join.guac
 TOPDIR = ../..
 include $(TOPDIR)/Makefile.rules
 

test/syscall_tests/join.c

@@ -0,0 +1,36 @@
+#include "userlib/syscall.h"
+#include "userlib/libnachos.h"
+
+
+const int N = 3;
+int iplein = 0;
+int ivide = 0;
+int tab[3];
+SemId svide;
+SemId splein;
+
+void th1();
+
+void th2();
+
+int main() {
+    ThreadId th1 = threadCreate("th1", th1);
+    ThreadId th2 = threadCreate("th2", th2);
+    Join(th1);
+    Join(th2);
+    return 0;
+}
+
+void th1() {
+    for(int i = 0; i < 10; i++) 
+    {
+        n_printf("Hello from th1\n");
+    }
+}
+
+void th2() {
+    for(int i = 0; i < 10; i++) 
+    {
+        n_printf("Hello from th2\n");
+    }
+}