From e422e657672362f1f7eaf8274e025f8c592d4a9a Mon Sep 17 00:00:00 2001
From: Quentin Legot <legotquentin@gmail.com>
Date: Tue, 28 Feb 2023 14:43:40 +0100
Subject: [PATCH] Add thread structure

---
 src/kernel/mod.rs        |  1 +
 src/kernel/process.rs    |  4 ++
 src/kernel/thread.rs     | 97 ++++++++++++++++++++++++++++++++++++++++
 src/simulator/machine.rs |  3 ++
 src/utility/mod.rs       |  3 +-
 src/utility/system.rs    |  9 ++++
 6 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 src/kernel/process.rs
 create mode 100644 src/utility/system.rs

diff --git a/src/kernel/mod.rs b/src/kernel/mod.rs
index 447d11e..bb7bfe3 100644
--- a/src/kernel/mod.rs
+++ b/src/kernel/mod.rs
@@ -1,2 +1,3 @@
+mod process;
 mod thread;
 mod scheduler;
\ No newline at end of file
diff --git a/src/kernel/process.rs b/src/kernel/process.rs
new file mode 100644
index 0000000..fe973f4
--- /dev/null
+++ b/src/kernel/process.rs
@@ -0,0 +1,4 @@
+
+pub struct Process {
+
+}
\ No newline at end of file
diff --git a/src/kernel/thread.rs b/src/kernel/thread.rs
index e69de29..3b6cd83 100644
--- a/src/kernel/thread.rs
+++ b/src/kernel/thread.rs
@@ -0,0 +1,97 @@
+use super::process::Process;
+use crate::{simulator::machine::{NUM_INT_REGS, NUM_FP_REGS}, utility::system::ObjectType};
+
+
+struct SimulatorContext {
+    // todo
+}
+
+struct ThreadContext {
+    pub int_registers: [i64; NUM_INT_REGS],
+    pub float_registers: [i64; NUM_FP_REGS],
+    pc: i64,
+}
+
+pub struct Thread {
+    name: String,
+    process: Option<Process>,
+    simulation_context: SimulatorContext,
+    thread_context: ThreadContext,
+    stack_pointer: i32,
+    object_type: ObjectType
+}
+
+impl Thread {
+
+    pub fn new(name: String) -> Self {
+        Self {
+            name,
+            process: None,
+            simulation_context: SimulatorContext {  },
+            thread_context: ThreadContext { 
+                int_registers: [0; NUM_INT_REGS], 
+                float_registers: [0; NUM_FP_REGS], 
+                pc: 0 
+            },
+            stack_pointer: 0,
+            object_type: ObjectType::THREAD_TYPE
+        }
+    }
+
+    /// Start a thread, attaching it to a process
+    pub fn start(&self, owner: &Process, func: i64, arg: i64) -> i32 {
+        todo!();
+    }
+
+    /// Wait for another thread to finish its execution
+    pub fn join(&self, id_thread: &Thread) {
+        todo!();
+    }
+
+    /// Relinquish the CPU if any other thread is runnable.
+    /// 
+    /// Cannot use yield as a function name -> reserved name in rust
+    pub fn t_yield(&self) {
+        todo!();
+    }
+
+    /// Put the thread to sleep and relinquish the processor
+    pub fn sleep(&self) {
+        todo!();
+    }
+
+    /// Finish the execution of the thread and prepare its deallocation
+    pub fn finish(&self) {
+        todo!();
+    }
+    
+    /// Check if a thread has overflowed its stack
+    pub fn check_overflow(&self) {
+        todo!();
+    }
+
+    pub fn init_simulator_context(&self, initial_pc_reg: i64, initial_sp: i64, arg: i64) {
+        todo!();
+    }
+
+    pub fn save_processor_state(&self) {
+        todo!();
+    }
+
+    pub fn restore_processor_state(&self) {
+        todo!();
+    }
+
+    pub fn save_simulator_state(&self) {
+        todo!();
+    }
+
+    pub fn restore_simulator_state(&self) {
+        todo!();
+    }
+
+    pub fn get_name(&self) -> String {
+        self.name.clone()
+    }
+
+}
\ No newline at end of file
diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index f3f635b..a4f91af 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -4,6 +4,9 @@ use super::{decode::{Instruction, decode}};
 use super::global::*;
 use std::fs::File;
 
+pub const NUM_INT_REGS: usize = 32;
+pub const NUM_FP_REGS: usize = 32;
+
 /// doit disparaitre
 const MEM_SIZE : usize = 4096;
 
diff --git a/src/utility/mod.rs b/src/utility/mod.rs
index 651aed7..4b92101 100644
--- a/src/utility/mod.rs
+++ b/src/utility/mod.rs
@@ -1 +1,2 @@
-pub mod list;
\ No newline at end of file
+pub mod list;
+pub mod system;
\ No newline at end of file
diff --git a/src/utility/system.rs b/src/utility/system.rs
new file mode 100644
index 0000000..bbcb003
--- /dev/null
+++ b/src/utility/system.rs
@@ -0,0 +1,9 @@
+
+pub enum ObjectType {
+    SEMAPHORE_TYPE,
+    LOCK_TYPE,
+    CONDITION_TYPE,
+    FILE_TYPE,
+    THREAD_TYPE,
+    INVALID_TYPE
+}
\ No newline at end of file