Initial commit: SUB-OS 64-Bit Production Monolithic Operating System with LazyBox userland suite

include/kernel/sync.h

@@ -0,0 +1,36 @@
+#ifndef _KERNEL_SYNC_H
+#define _KERNEL_SYNC_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct {
+    volatile uint32_t lock;
+} spinlock_t;
+
+#define SPINLOCK_INIT { .lock = 0 }
+
+static inline void spinlock_init(spinlock_t* lock) {
+    lock->lock = 0;
+}
+
+static inline void spin_lock(spinlock_t* lock) {
+    while (__atomic_test_and_set(&lock->lock, __ATOMIC_ACQUIRE)) {
+        __asm__ volatile ("pause");
+    }
+}
+
+static inline void spin_unlock(spinlock_t* lock) {
+    __atomic_clear(&lock->lock, __ATOMIC_RELEASE);
+}
+
+typedef struct {
+    spinlock_t lock;
+    volatile int count;
+} semaphore_t;
+
+void sem_init(semaphore_t* sem, int value);
+void sem_wait(semaphore_t* sem);
+void sem_post(semaphore_t* sem);
+
+#endif // _KERNEL_SYNC_H