Minor changes to build system

include/error.h

@@ -5,6 +5,9 @@ typedef enum {
     /* Success */
     KERNEL_STATUS_SUCCESS,
 
+    KERNEL_MUTEX_ACQUIRED,
+    KERNEL_MUTEX_LOCKED,
+
     /* General error */
     KERNEL_STATUS_ERROR,
 } kstatus;

include/lock.h

@@ -1,9 +1,23 @@
+#include <error.h>
 #include <stdatomic.h>
+#include <stdbool.h>
 
 #ifndef SPINLOCK_H
 #define SPINLOCK_H
 
+struct mutex {
+    atomic_flag lock;
+    bool locked;
+    struct thread *holder;
+};
+
 void acquire_spinlock(atomic_flag *lock);
 void free_spinlock(atomic_flag *lock);
 
+struct mutex *init_mutex();
+kstatus acquire_mutex(struct mutex *mut);
+void free_mutex(struct mutex *mut);
+kstatus try_mutex(struct mutex *mut);
+
+
 #endif

include/scheduler/sched.h

@@ -3,6 +3,7 @@
 #pragma once
 
 typedef enum proc_state {
+    ZOMBIE = 4,
     RUNNING = 3,
     READY = 2,
     SLEEPING = 1,

include/sys/time.h

@@ -0,0 +1,3 @@
+#include <stdint.h>
+uint64_t get_timestamp_ns();
+void sleep(int ms);