diff --git a/src/kernel/process.rs b/src/kernel/process.rs
index 5ae7efc..a56883e 100644
--- a/src/kernel/process.rs
+++ b/src/kernel/process.rs
@@ -1,5 +1,5 @@
 
 #[derive(PartialEq)]
 pub struct Process {
-
+    pub num_thread: usize,
 }
\ No newline at end of file
diff --git a/src/kernel/scheduler.rs b/src/kernel/scheduler.rs
index 7cfe0ee..d2670b3 100644
--- a/src/kernel/scheduler.rs
+++ b/src/kernel/scheduler.rs
@@ -3,7 +3,7 @@ use crate::kernel::thread::Thread;
 use crate::utility::system::{G_CURRENT_THREAD, G_THREAD_TO_BE_DESTROYED};
 
 
-struct Scheduler<> {
+struct Scheduler {
     ready_list: List<Thread>
 }
 
diff --git a/src/kernel/thread.rs b/src/kernel/thread.rs
index 922df0e..a4301f8 100644
--- a/src/kernel/thread.rs
+++ b/src/kernel/thread.rs
@@ -1,6 +1,7 @@
 use super::process::Process;
-use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS}, utility::system::ObjectType};
+use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS, STACK_REG}, utility::system::ObjectType};
 
+const SIMULATORSTACKSIZE: usize = 32 * 1024;
 
 #[derive(PartialEq)]
 struct SimulatorContext {
@@ -42,10 +43,23 @@ impl Thread {
     }
 
     /// Start a thread, attaching it to a process
-    pub fn start(&self, owner: &Process, func: i64, arg: i64) -> i32 {
+    pub fn start(&mut self, owner: Process, func: i64, arg: i64) -> i32 {
+        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!();
     }
 
+    fn init_thread_context(&mut self, initial_pc_reg: i64, initial_sp: i64, arg: i64) {
+        self.thread_context.pc = initial_pc_reg;
+        self.thread_context.int_registers[10] = arg;
+        self.thread_context.int_registers[STACK_REG] = initial_sp;
+    }
+
     /// Wait for another thread to finish its execution
     pub fn join(&self, id_thread: &Thread) {
         todo!();
@@ -73,7 +87,7 @@ impl Thread {
         todo!();
     }
 
-    pub fn init_simulator_context(&self, initial_pc_reg: i64, initial_sp: i64, arg: i64) {
+    pub fn init_simulator_context(&self, base_stack_addr: [i8; SIMULATORSTACKSIZE]) {
         todo!();
     }
 
@@ -97,4 +111,13 @@ impl Thread {
         self.name.clone()
     }
 
+}
+
+impl Drop for Thread {
+
+    fn drop(&mut self) {
+        self.object_type = ObjectType::InvalidType;
+        todo!();
+    }
+
 }
\ No newline at end of file
diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index a4f91af..6523628 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -4,6 +4,8 @@ use super::{decode::{Instruction, decode}};
 use super::global::*;
 use std::fs::File;
 
+pub const STACK_REG: usize = 2;
+
 pub const NUM_INT_REGS: usize = 32;
 pub const NUM_FP_REGS: usize = 32;
 
diff --git a/src/utility/system.rs b/src/utility/system.rs
index 4c274ec..701e0b7 100644
--- a/src/utility/system.rs
+++ b/src/utility/system.rs
@@ -1,13 +1,16 @@
-use std::sync::{Mutex, RwLock};
+use std::sync::{RwLock, Arc};
 
 use lazy_static::lazy_static;
 
 use crate::kernel::thread::Thread;
+
+use super::list::List;
 extern crate lazy_static;
 
 lazy_static! {
     pub static ref G_CURRENT_THREAD: RwLock<Option<Thread>> = RwLock::new(Option::None);
     pub static ref G_THREAD_TO_BE_DESTROYED: RwLock<Option<Thread>> = RwLock::new(Option::None);
+    // pub static ref G_ALIVE: Arc<RwLock<List<Thread>>> = Arc::new(RwLock::new(List::new()));
 }