spinlock

Makefile

@@ -18,6 +18,7 @@ KERNEL_SOURCES := \
 	src/kernel.c \
 	src/output.c \
 	src/pci.c    \
+	src/sync.c   \
 	$(KERNEL_SOURCES_$(ARCH)) \
 	# end of kernel sources list
 

include/sync.h

@@ -0,0 +1,13 @@
+#ifndef KARLOS_SYNC_H
+#define KARLOS_SYNC_H
+
+#include "stdatomic.h"
+
+struct spinlock {
+    atomic_int lock;
+};
+
+void spin_lock(struct spinlock *s);
+void spin_unlock(struct spinlock *s);
+
+#endif

src/sync.c

@@ -0,0 +1,11 @@
+#include "sync.h"
+
+void spin_lock(struct spinlock *s) {
+    while (atomic_exchange_explicit(&s->lock, 1, memory_order_acquire)) {
+        // spin
+    }
+}
+
+void spin_unlock(struct spinlock *s) {
+    atomic_store_explicit(&s->lock, 0, memory_order_release);
+}