From 8fff875529ea821d06a24567e1cbd08f589255d5 Mon Sep 17 00:00:00 2001
From: Klagarge <remi@heredero.ch>
Date: Tue, 31 Mar 2026 21:06:44 +0200
Subject: [PATCH] feat(lab02): add ex06

---
 doc/lab-01_02.typ               |  2 ++
 src/01-skeleton/s02e06-thread.c | 42 +++++++++++++++++++++++++++++++++
 src/01-skeleton/skeleton.c      | 11 +++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 src/01-skeleton/s02e06-thread.c

diff --git a/doc/lab-01_02.typ b/doc/lab-01_02.typ
index 9814459..5d156ac 100644
--- a/doc/lab-01_02.typ
+++ b/doc/lab-01_02.typ
@@ -369,6 +369,8 @@ registers[0] = ioremap(CHIP_ID_BASE_ADDR, 0x1000);
   ]
 )
 
+Easy exercice, a thread in the kernet is a `struct task_struct*` that can be created with `kthread_run`
+
 //-------------------
 // Exercise 7: Sleeping
 //-------------------
diff --git a/src/01-skeleton/s02e06-thread.c b/src/01-skeleton/s02e06-thread.c
new file mode 100644
index 0000000..59082b5
--- /dev/null
+++ b/src/01-skeleton/s02e06-thread.c
@@ -0,0 +1,42 @@
+#include <linux/module.h>	// needed by all modules
+#include <linux/init.h>		// needed for macros
+#include <linux/kernel.h>	// needed for debugging
+
+
+#include <linux/kthread.h>
+#include <linux/delay.h>
+
+static struct task_struct* sample_thread;
+
+#define DELAY_S 5
+
+int thread_skeletonThread (void* data) {
+
+    pr_info("Thread started\n");
+
+    while (!kthread_should_stop()) {
+        pr_info("PING!\n");
+        ssleep(DELAY_S);
+    }
+
+    return 0;
+}
+
+void thread_init(void) {
+    pr_info("Initialize kernel thread\n");
+
+    sample_thread = kthread_run(thread_skeletonThread, NULL, "The Machine that goes");
+    if (IS_ERR(sample_thread)) {
+        pr_err("Failed to create kernel thread\n");
+        return;
+    }
+
+    pr_info("Kernel thread initialized\n");
+
+}
+
+void thread_exit(void) {
+    pr_info("Exiting kernel thread\n");
+    kthread_stop(sample_thread);
+    pr_info("Kernel thread exited\n");
+}
diff --git a/src/01-skeleton/skeleton.c b/src/01-skeleton/skeleton.c
index e2b690d..1346214 100644
--- a/src/01-skeleton/skeleton.c
+++ b/src/01-skeleton/skeleton.c
@@ -6,6 +6,7 @@
 #include "s02e02-parameters.c"
 #include "s02e04-dynamic_allocation.c"
 #include "s02e05-io_memory_mapped.c"
+#include "s02e06-thread.c"
 
 
 static int __init skeleton_init(void) {
@@ -27,6 +28,11 @@ static int __init skeleton_init(void) {
 
     pr_info("--------------------\n");
 
+    // Lab02 - Exercise 6: Kernel thread
+    thread_init();
+
+    pr_info("--------------------\n");
+
     pr_info("Linux module skeleton loaded\n");
 	return 0;
 }
@@ -44,6 +50,11 @@ static void __exit skeleton_exit(void) {
 
     pr_info("--------------------\n");
 
+    // Lab02 - Exercise 6: Kernel thread
+    thread_exit();
+
+    pr_info("--------------------\n");
+
     pr_info ("Linux module skeleton unloaded\n");
 }