Merge branch 'vm/syscall-mmap/styling' into 'master'

Refactor page to follow pintos styling for indentation and add spacing for readability

See merge request lab2425_autumn/pintos_22!69

src/threads/thread.c

@@ -736,6 +736,8 @@ init_thread (struct thread *t, const char *name, int nice, int priority,
   t->recent_cpu = recent_cpu;
   t->priority = t->base_priority;
 
+  lock_init (&t->pages_lock);
+
   old_level = intr_disable ();
   list_push_back (&all_list, &t->allelem);
   intr_set_level (old_level);

src/threads/thread.h

@@ -136,6 +136,7 @@ struct thread
     struct list_elem elem;              /* List element. */
 
     struct hash pages;                  /* Table of open user pages. */
+    struct lock pages_lock; /* Lock for the supplementary page table. */
 
     /* Memory mapped files for user virtual memory. */
     struct hash mmap_files;             /* List of memory mapped files. */

src/userprog/exception.c

@@ -181,11 +181,11 @@ page_fault (struct intr_frame *f)
   /* If the page fault occurred in kernel mode,  then we intentionally indicate
      a fault (for get_user() etc). */
   if (!user)
-  {
-    f->eip = (void *)f->eax;
-    f->eax = 0xffffffff;
-    return;
-  }
+    {
+      f->eip = (void *)f->eax;
+      f->eax = 0xffffffff;
+      return;
+    }
 
 
   /* To implement virtual memory, delete the rest of the function

src/userprog/process.c

@@ -371,7 +371,9 @@ process_exit (void)
   hash_destroy (&cur->open_files, fd_cleanup);
 
   /* Clean up the thread's supplemental page table. */
+  lock_acquire (&cur->pages_lock);
   hash_destroy (&cur->pages, page_cleanup);
+  lock_release (&cur->pages_lock);
 
   /* Close the executable file, implicitly allowing it to be written to. */
   if (cur->exec_file != NULL)

src/vm/frame.c

@@ -241,6 +241,7 @@ frame_owner_insert (void *frame, struct thread *owner)
   struct frame_owner *frame_owner = malloc (sizeof (struct frame_owner));
   if (frame_owner == NULL)
     return false;
+
   frame_owner->owner = owner;
   list_push_back (&frame_metadata->owners, &frame_owner->elem);
   return true;
@@ -263,6 +264,7 @@ frame_owner_remove (void *frame, struct thread *owner)
     {
       struct frame_owner *frame_owner
           = list_entry (oe, struct frame_owner, elem);
+
       oe = list_next (oe);
       if (frame_owner->owner == owner)
         {
@@ -284,6 +286,7 @@ frame_metadata_find (void *frame)
   struct hash_elem *e = hash_find (&frame_table, &key_metadata.hash_elem);
   if (e == NULL)
     return NULL;
+
   return hash_entry (e, struct frame_metadata, hash_elem);
 }
 

src/vm/mmap.c

@@ -67,26 +67,27 @@ mmap_unmap (struct mmap_entry *mmap)
      if necessary. */
   off_t length = file_length (mmap->file);
   for (off_t ofs = 0; ofs < length; ofs += PGSIZE)
-  {
-    void *upage = mmap->upage + ofs;
-
-    /* Get the SPT page entry for this page. */
-    struct page_entry *page = page_get(thread_current (), upage);
-    if (page == NULL)
-      continue;
-
-    /* Write the page back to the file if it is dirty. */
-    if (pagedir_is_dirty (thread_current ()->pagedir, upage))
     {
-      lock_acquire (&filesys_lock);
-      file_write_at (mmap->file, upage, page->read_bytes, ofs);
-      lock_release (&filesys_lock);
+      void *upage = mmap->upage + ofs;
+
+      /* Get the SPT page entry for this page. */
+      struct page_entry *page = page_get(thread_current (), upage);
+      if (page == NULL)
+        continue;
+
+      /* Write the page back to the file if it is dirty. */
+      if (pagedir_is_dirty (thread_current ()->pagedir, upage))
+        {
+          lock_acquire (&filesys_lock);
+          file_write_at (mmap->file, upage, page->read_bytes, ofs);
+          lock_release (&filesys_lock);
+        }
+
+      /* Remove the page from the supplemental page table. */
+      hash_delete (&thread_current ()->pages, &page->elem);
     }
 
-    /* Remove the page from the supplemental page table. */
-    hash_delete (&thread_current ()->pages, &page->elem);
-  }
-
+  /* Close the file and free the mmap entry. */
   file_close (mmap->file);
   free (mmap);
 }

src/vm/page.c

@@ -90,6 +90,7 @@ page_insert_swapped (void *upage, void *kpage, struct list *owners)
 
       /* 1. Initialize swapped page entry. */
       struct page_entry *page = page_get (owner, upage);
+      lock_acquire (&owner->pages_lock);
       if (page == NULL)
         {
           page = malloc (sizeof (struct page_entry));
@@ -113,6 +114,7 @@ page_insert_swapped (void *upage, void *kpage, struct list *owners)
       page_set_swap (owner, pte, swap_slot);
 
       lock_release (&page->lock);
+      lock_release (&owner->pages_lock);
     }
   if (exec_file != NULL)
     {
@@ -155,7 +157,10 @@ page_insert_file (struct file *file, off_t ofs, void *upage,
   page->writable = writable;
   lock_init (&page->lock);
 
-  hash_insert (&thread_current ()->pages, &page->elem);
+  struct thread *t = thread_current ();
+  lock_acquire (&t->pages_lock);
+  hash_insert (&t->pages, &page->elem);
+  lock_release (&t->pages_lock);
   return page;
 }
 
@@ -167,8 +172,10 @@ page_get (struct thread *thread, void *upage)
   struct page_entry fake_page_entry;
   fake_page_entry.upage = upage;
 
+  lock_acquire (&thread->pages_lock);
   struct hash_elem *e
     = hash_find (&thread->pages, &fake_page_entry.elem);
+  lock_release (&thread->pages_lock);
   if (e == NULL)
       return NULL;
 
@@ -188,6 +195,7 @@ page_load_file (struct page_entry *page)
       lock_acquire (&shared_file_pages_lock);
       struct shared_file_page *sfp
           = shared_file_page_get (page->file, page->upage);
+
       if (sfp != NULL)
         {
           /* Frame exists, just install it. */
@@ -200,7 +208,8 @@ page_load_file (struct page_entry *page)
                 }
               frame_owner_insert (sfp->frame, t);
             }
-            /* Shared page is in swap. Load it. */
+
+            /* Otherwise, shared page is in swap. Load it. */
             else
               {
                 void *frame = frame_alloc (PAL_USER, page->upage, t);
@@ -216,6 +225,7 @@ page_load_file (struct page_entry *page)
                     return false;
                   }
               }
+
             page_flag_shared (t, page->upage, true);
             if (page->type != PAGE_SHARED)
               {
@@ -313,12 +323,12 @@ page_cleanup (struct hash_elem *e, void *aux UNUSED)
 /* Flags the provided page table entry as representing a swapped out page. */
 void
 page_flag_swap (uint32_t *pte, bool set)
-  {
-    if (set)
-      *pte |= (1 << SWAP_FLAG_BIT);
-    else
-      *pte &= ~(1 << SWAP_FLAG_BIT);
-  }
+{
+  if (set)
+    *pte |= (1 << SWAP_FLAG_BIT);
+  else
+    *pte &= ~(1 << SWAP_FLAG_BIT);
+}
 
 /* Sets the address bits of the page table entry to the provided swap slot
    value. To be used for later retrieval of the swap slot when page faulting. */