stuff2

kernel/core/spin.c

@@ -1,16 +1,15 @@
 #include <kernel/spin.h>
 #include <stdatomic.h>
 
-// TODO: Ticketing system
-
 void spin_lock(struct spinlock* spin) {
-    while (atomic_exchange_explicit(&spin->locked, true, memory_order_acquire)) {
+    uint32_t my = atomic_fetch_add_explicit(&spin->next, 1, memory_order_relaxed);
+
+    while (atomic_load_explicit(&spin->owner, memory_order_acquire) != my) {
         asm volatile("pause");
     }
-
-    atomic_store_explicit(&spin->locked, true, memory_order_release);
 }
 
 void spin_unlock(struct spinlock* spin) {
-    atomic_store_explicit(&spin->locked, false, memory_order_release);
+    uint32_t val = atomic_load_explicit(&spin->owner, memory_order_relaxed);
+    atomic_store_explicit(&spin->owner, val + 1, memory_order_release);
 }