diff --git a/Cargo.lock b/Cargo.lock
index e3bcbe3..9bb9ed5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,6 +11,6 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.139"
+version = "0.2.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
diff --git a/Cargo.toml b/Cargo.toml
index 1d66884..95cb216 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,3 +5,6 @@ edition = "2021"
 
 [dependencies]
 libc = { version = "0.2.139", features = ["extra_traits"] }
+
+[registries.crates-io]
+protocol = "sparse"
\ No newline at end of file
diff --git a/src/kernel/thread.rs b/src/kernel/thread.rs
index 370c1e2..92f8986 100644
--- a/src/kernel/thread.rs
+++ b/src/kernel/thread.rs
@@ -16,7 +16,7 @@ macro_rules! get_new_thread {
 pub struct ThreadContext {
     pub int_registers: [i64; NUM_INT_REGS],
     pub float_registers: [f32; NUM_FP_REGS],
-    pc: i64,
+    pub pc: i64,
 }
 
 #[derive(PartialEq, Debug)]
diff --git a/src/kernel/thread_manager.rs b/src/kernel/thread_manager.rs
index fc0a614..0786fa1 100644
--- a/src/kernel/thread_manager.rs
+++ b/src/kernel/thread_manager.rs
@@ -84,7 +84,7 @@ impl ThreadManager {
     }
 
     /// Start a thread, attaching it to a process
-    pub fn start_thread(&mut self, thread: Rc<RefCell<Thread>>, owner: Process, func_pc: i64, argument: i64) -> Result<(), ErrorCode> {
+    pub fn start_thread(&mut self, thread: Rc<RefCell<Thread>>, owner: Process, func_pc: i64, argument: i64) {
         let mut thread_m = thread.borrow_mut();
         assert_eq!(thread_m.process, Option::None);
         thread_m.process = Option::Some(owner);
@@ -95,7 +95,6 @@ impl ThreadManager {
         thread_m.process.as_mut().unwrap().num_thread += 1;
         self.get_g_alive().push(Rc::clone(&thread));
         self.ready_to_run(Rc::clone(&thread));
-        Result::Ok(())
     }
 
     /// Wait for another thread to finish its execution
@@ -193,7 +192,30 @@ impl ThreadManager {
 
 #[cfg(test)]
 mod test {
+    use std::{rc::Rc, cell::RefCell};
 
-    
+    use crate::{simulator::machine::Machine, kernel::{system::System, thread::Thread, process::Process}};
+
+    #[test]
+    fn test_thread_context() {
+        let mut machine = Machine::init_machine();
+        let mut system = 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, thread1_func as i64, 0);
+        assert_eq!(thread1.borrow_mut().thread_context.pc, thread1_func as i64);
+        let to_run = system.get_thread_manager().find_next_to_run().unwrap();
+        assert_eq!(to_run, Rc::clone(&thread1));
+        assert!(system.get_thread_manager().get_g_alive().contains(&Rc::clone(&thread1)));
+        system.get_thread_manager().switch_to(&mut machine, Rc::clone(&to_run));
+        
+        println!("{:#?}", thread1.borrow_mut().thread_context);
+    }
+
+    fn thread1_func() {
+        println!("Hello");
+    }
 
 }
\ No newline at end of file