#ifndef VM_FRAME_H
#define VM_FRAME_H

#include "threads/thread.h"
#include "threads/palloc.h"

struct frame_owner
{
  struct thread *owner;  /* The thread that owns the frame. */
  struct list_elem elem; /* List element for the list of owners. */
};

void frame_init (void);
void *frame_alloc (enum palloc_flags, void *, struct thread *);
void frame_pin (void *frame);
void frame_unpin (void *frame);
void frame_free (void *frame);

bool frame_owner_insert (void *frame, struct thread *owner);
void frame_owner_remove (void *frame, struct thread *owner);

#endif /* vm/frame.h */