diff --git a/src/kernel/mod.rs b/src/kernel/mod.rs
index 67a43cb..1fe4f0f 100644
--- a/src/kernel/mod.rs
+++ b/src/kernel/mod.rs
@@ -1,4 +1,4 @@
-mod process;
+pub mod process;
 pub mod thread;
 pub mod mgerror;
 pub mod system;
diff --git a/src/main.rs b/src/main.rs
index cc181fe..2774e7b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,10 +13,28 @@ mod kernel;
 /// module containing useful tools which can be use in most part of the OS to ease the development of the OS
 pub mod utility;
 
+use std::{rc::Rc, cell::RefCell};
+
 use kernel::system::System;
-use simulator::machine::Machine;
+use simulator::{machine::Machine, loader};
+
+use crate::kernel::{thread::Thread, process::Process};
 
 fn main() {
-    let machine = Machine::init_machine();
-    let system = System::default();
+    let mut machine = Machine::init_machine();
+    loader::load("test.o", &mut machine, 0).expect("IO Error");
+    let system = &mut System::default();
+    let thread1 = Thread::new("th1");
+    let thread1 = Rc::new(RefCell::new(thread1));
+    system.get_thread_manager().get_g_alive().push(Rc::clone(&thread1));
+    let owner = Process { num_thread: 0 };
+    system.get_thread_manager().start_thread(Rc::clone(&thread1), owner, 0 as i64, 0);
+    debug_assert_eq!(thread1.borrow_mut().thread_context.pc, 0 as i64);
+    let to_run = system.get_thread_manager().find_next_to_run().unwrap();
+    debug_assert_eq!(to_run, Rc::clone(&thread1));
+    debug_assert!(system.get_thread_manager().get_g_alive().contains(&Rc::clone(&thread1)));
+    system.get_thread_manager().switch_to(&mut machine, Rc::clone(&to_run));
+    
+    machine.run();
+    
 }
diff --git a/src/simulator/loader.rs b/src/simulator/loader.rs
index 4b84b83..3404128 100644
--- a/src/simulator/loader.rs
+++ b/src/simulator/loader.rs
@@ -3,6 +3,7 @@ use crate::Machine;
 use std::fs;
 use std::io;
 use std::io::BufRead;
+use std::io::Read;
 
 
 
@@ -15,6 +16,7 @@ use std::io::BufRead;
 	/// 
 	/// - **path** the path of the file to load
 	/// - **size** the number of bytes to write (1, 2, 4 or 8)
+#[deprecated]
 pub fn _load(path : &str, instruction_size: i32) -> Machine {
     let file = fs::File::open(path).expect("Wrong filename");
     let reader = io::BufReader::new(file);
@@ -31,4 +33,33 @@ pub fn _load(path : &str, instruction_size: i32) -> Machine {
     }
     println!("{:x}", Machine::read_memory(& mut machine, 4, 0));
     machine
+}
+
+/// load a 32-bits binary file into the machine
+/// 
+/// ### Parameters
+/// 
+/// - **path** path of the file to load
+/// - **machine** the machine where the bin file will be loaded
+/// - **start_index** at which index of machine memory you want to start to load the program
+/// 
+/// Returns in a Result any io error
+pub fn load(path: &str, machine: &mut Machine, start_index: usize) -> Result<(), std::io::Error> {
+    let mut file = fs::File::open(path)?;
+    let mut instructions: Vec<u32> = Default::default();
+    loop {
+        let mut buf: [u8; 4] = [0; 4];
+        let res = file.read(&mut buf)?;
+        if res == 0 {
+            break; // eof
+        } else {
+            instructions.push(u32::from_le_bytes(buf));
+        }
+    }
+    for i in 0..instructions.len() {
+        machine.write_memory(4, 4 * i + start_index, instructions[i] as u64);
+    }
+    #[cfg(debug_assertions)]
+    println!("{:04x?}", instructions); // only print loaded program in debug build
+    Ok(())
 }
\ No newline at end of file
diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index e54bd87..7d62e78 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -146,7 +146,7 @@ impl Machine {
 	/// - **machine** which contains the main memory
 	/// - **size** the number of bytes to read (1, 2, 4, 8)
 	/// - **address** in the memory to read
-	pub fn read_memory(machine : &mut Machine, size : i32, address : usize) -> u64 {
+	pub fn read_memory(&mut self, size : i32, address : usize) -> u64 {
 		if ![1, 2, 4, 8].contains(&size) {
 			panic!("ERROR read_memory : wrong size parameter {size}, must be (1, 2, 4 or 8)");
 		}
@@ -154,7 +154,7 @@ impl Machine {
 		let mut ret: u64 = 0;
 		for i in 0..size {
 			ret <<= 8;
-			ret += machine.main_memory[address + i as usize] as u64;
+			ret += self.main_memory[address + i as usize] as u64;
 		}
 		ret
 	}
@@ -169,13 +169,13 @@ impl Machine {
 	/// - **size** the number of bytes to write (1, 2, 4 or 8)
 	/// - **address** the address to write to
 	/// - **value** data to be written
-	pub fn write_memory(machine: &mut Machine, size: i32, address: usize, value: u64) {
+	pub fn write_memory(&mut self, size: i32, address: usize, value: u64) {
 		if ![1, 2, 4, 8].contains(&size) {
 			panic!("ERROR write_memory: WRONG `size` PARAMETER ({size}), must be 1, 2, 4 or 8")
 		}
 		for i in 0..size as usize {
 			let inv_i = size as usize - i - 1;
-			machine.main_memory[address + i] = ((value & 0xff << (8 * inv_i)) >> (inv_i * 8)) as u8;
+			self.main_memory[address + i] = ((value & 0xff << (8 * inv_i)) >> (inv_i * 8)) as u8;
 		}
 	}
 
@@ -185,11 +185,11 @@ impl Machine {
 	/// ### Parameters
 	/// 
 	///  - **machine** contains the memory
-	pub fn _extract_memory(machine: &mut Machine){
+	pub fn _extract_memory(&mut self){
 		let file_path = "burritos_memory.txt";
 		let write_to_file = |path| -> std::io::Result<File> {
 			let mut file = File::create(path)?;
-			file.write_all(&machine.main_memory)?;
+			file.write_all(&self.main_memory)?;
 			Ok(file)
 		};
 		match write_to_file(file_path) {
@@ -198,20 +198,20 @@ impl Machine {
 		};
 	}
 
-	pub fn print_machine_status(machine: &mut Machine) {
+	pub fn print_machine_status(&mut self) {
 		println!("######### Machine status #########");
 		for i in (0..32).step_by(3) {
-			print!(">{0: <4} : {1:<16x} ", print::REG_X[i], machine.int_reg.get_reg(i));
-			print!(">{0: <4} : {1:<16x} ", print::REG_X[i+1], machine.int_reg.get_reg(i+1));
+			print!(">{0: <4} : {1:<16x} ", print::REG_X[i], self.int_reg.get_reg(i));
+			print!(">{0: <4} : {1:<16x} ", print::REG_X[i+1], self.int_reg.get_reg(i+1));
 			if i+2 < 32 {
-				print!(">{0: <4} : {1:<16x} ", print::REG_X[i+2], machine.int_reg.get_reg(i+2));
+				print!(">{0: <4} : {1:<16x} ", print::REG_X[i+2], self.int_reg.get_reg(i+2));
 			}
 			println!();
 		}
 		println!("________________SP________________");
-		let sp_index = machine.int_reg.get_reg(2);
+		let sp_index = self.int_reg.get_reg(2);
 		for i in 0..5 {
-			println!("SP+{:<2} : {:16x}", i*8, Self::read_memory(machine, 8, (sp_index + i*8) as usize));
+			println!("SP+{:<2} : {:16x}", i*8, Self::read_memory(self, 8, (sp_index + i*8) as usize));
 		}		
 		println!("##################################");
 	}
@@ -229,9 +229,9 @@ impl Machine {
 	/// ### Parameters
 	/// 
 	/// - **machine** which contains a table of instructions
-	pub fn run(machine : &mut Machine){
-		while Machine::one_instruction(machine) == 0 {}
-		println!("trace : \n{}", machine.registers_trace);
+	pub fn run(&mut self){
+		while Machine::one_instruction(self) == 0 {}
+		println!("trace : \n{}", self.registers_trace);
 	}
 
 	/// execute the current instruction
diff --git a/src/simulator/print.rs b/src/simulator/print.rs
index 54bcddf..c9b62b1 100644
--- a/src/simulator/print.rs
+++ b/src/simulator/print.rs
@@ -216,7 +216,7 @@ pub fn print(ins: Instruction, pc: i32) -> String { //TODO pc should be u64
         RISCV_SYSTEM => {
             "ecall".to_string()
         },
-        _ => todo!("{:x} opcode non géré  pc : {:x}, value : {:x}", ins.opcode, pc, ins.value) // Change todo! to panic! in the future, I put todo! because there's a lot of opcode currently not implemented
+        _ => unreachable!("{:x} opcode non géré  pc : {:x}, value : {:x}", ins.opcode, pc, ins.value)
     }
 
 }