Implement Thread::start and join

src/kernel/thread.rs

@@ -1,5 +1,7 @@
-use super::process::Process;
-use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS, STACK_REG}, utility::system::ObjectType};
+use std::sync::Arc;
+
+use super::{process::Process, mgerror::ErrorCode};
+use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS, STACK_REG}, utility::system::{ObjectType, G_ALIVE, G_SCHEDULER}, kernel::scheduler};
 
 const SIMULATORSTACKSIZE: usize = 32 * 1024;
 
@@ -43,15 +45,31 @@ impl Thread {
     }
 
     /// Start a thread, attaching it to a process
-    pub fn start(&mut self, owner: Process, func: i64, arg: i64) -> i32 {
+    pub fn start(mut self, owner: Process, func: i64, arg: i64) -> Result<(), ErrorCode> {
         self.process = Option::Some(owner);
         let ptr = 0; // todo addrspace
         self.init_thread_context(func, ptr, arg);
         let base_stack_addr: [i8; SIMULATORSTACKSIZE] = [0; SIMULATORSTACKSIZE]; // todo AllocBoundedArray
         self.init_simulator_context(base_stack_addr);
         self.process.as_mut().unwrap().num_thread += 1;
-        
-        todo!();
+        match G_ALIVE.write() {
+            Ok(mut alive) => {
+                let this = Arc::new(self);
+                alive.push(Arc::clone(&this));
+                match G_SCHEDULER.write() {
+                    Ok(mut scheduler) => {
+                        scheduler.ready_to_run(Arc::clone(&this));
+                    },
+                    Err(err) => {
+                        panic!("RwLock poisonned, {}", err);
+                    }
+                }
+            },
+            Err(err) => {
+                panic!("RwLock poisonned, {}", err);
+            }
+        }
+        Result::Ok(())
     }
 
     fn init_thread_context(&mut self, initial_pc_reg: i64, initial_sp: i64, arg: i64) {
@@ -60,11 +78,24 @@ impl Thread {
         self.thread_context.int_registers[STACK_REG] = initial_sp;
     }
 
-    /// Wait for another thread to finish its execution
-    pub fn join(&self, id_thread: &Thread) {
+    fn init_simulator_context(&self, base_stack_addr: [i8; SIMULATORSTACKSIZE]) {
         todo!();
     }
 
+    /// Wait for another thread to finish its execution
+    pub fn join(&self, id_thread: Arc<Thread>) {
+        match G_ALIVE.write() {
+            Ok(alive) => {
+                while alive.contains(&Arc::clone(&id_thread)) {
+                    self.t_yield();
+                }
+            },
+            Err(err) => {
+                panic!("RwLock poisonned, {}", err)
+            }
+        }
+    }
+
     /// Relinquish the CPU if any other thread is runnable.
     /// 
     /// Cannot use yield as a function name -> reserved name in rust
@@ -87,10 +118,6 @@ impl Thread {
         todo!();
     }
 
-    pub fn init_simulator_context(&self, base_stack_addr: [i8; SIMULATORSTACKSIZE]) {
-        todo!();
-    }
-
     pub fn save_processor_state(&self) {
         todo!();
     }