Initialised shared_files global hash table, w/ G

src/vm/page.c

@@ -1,15 +1,15 @@
 #include "page.h"
 #include <string.h>
-#include <stdio.h>
 #include "filesys/file.h"
 #include "threads/malloc.h"
 #include "threads/palloc.h"
 #include "userprog/process.h"
 #include "vm/frame.h"
 
-static struct hash shared_files;
-
 static struct shared_file_entry *shared_file_get (struct file *file);
+static unsigned shared_page_hash (const struct hash_elem *e, void *aux UNUSED);
+static bool shared_page_less (const struct hash_elem *a_,
+                              const struct hash_elem *b_, void *aux UNUSED);
 
 /* Hashing function needed for the SPT table. Returns a hash for an entry,
    based on its upage. */
@@ -135,14 +135,14 @@ shared_file_less (const struct hash_elem *a_, const struct hash_elem *b_,
 
 /* Hashing function needed for the shared pages table. Returns a hash for an
    entry based on its user virtual address (upage) pointer. */
-unsigned
+static unsigned
 shared_page_hash (const struct hash_elem *e, void *aux UNUSED)
 {
   return hash_ptr (hash_entry (e, struct shared_page_entry, elem)->upage);
 }
 
 /* Less function needed for the shared pages table. */
-bool
+static bool
 shared_page_less (const struct hash_elem *a_, const struct hash_elem *b_,
                   void *aux UNUSED)
 {
@@ -238,5 +238,5 @@ page_set_swap (struct thread *owner, void *upage, size_t swap_slot)
 size_t
 page_get_swap (struct thread *owner, void *upage)
 {
-
+  return 0;
 }