initial implementation of memory mapped files

1 files changed, 16 insertions, 2 deletions

diff --git a/userprog/process.c b/userprog/process.c
index 2771e76..f399038 100644
--- a/userprog/process.c
+++ b/userprog/process.c
@@ -130,6 +130,8 @@ start_process (void *aux)
   thread->process = process;
 
   page_table_init (&thread->page_table);
+  if (!mmap_table_init (&process->mmap_table))
+    goto signal;
 
   /* Initialize interrupt frame and load executable. */
   memset (&if_, 0, sizeof if_);
@@ -149,6 +151,14 @@ start_process (void *aux)
   /* If process startup failed, quit. */
   if (thread->process == NULL)  {
     if (process != NULL) {
+      //TODO: free mmap table + page table?
+
+      /* close/free memory mapped files */
+      //mmap_table_free (&process->mmap_table);
+
+      /* free page table */
+      //page_table_free (&thread->page_table);
+
       if (process->fd_table.fds != NULL)
         palloc_free_page (process->fd_table.fds);
       palloc_free_page (process);
@@ -232,6 +242,9 @@ process_exit (void)
     lock_release (&filesys_lock);
   }
 
+  /* close/free memory mapped files */
+  mmap_table_free (&proc->mmap_table);
+
   int fd;
   for (fd = 2; fd <= proc->fd_table.fd_max; fd++) {
     process_close_file (fd);
@@ -254,6 +267,7 @@ process_exit (void)
     pagedir_destroy (pd);
   }
 
+  /* free page table */
   page_table_free (&thread->page_table);
 
   /* Destroy the process structure if the parent is not alive
@@ -560,8 +574,8 @@ load_segment (struct file *file, off_t ofs, uint8_t *upage,
       size_t page_zero_bytes = PGSIZE - page_read_bytes;
 
       /* add segment to page table for on demand loading */
-      if (!page_table_insert_segment (file, ofs, upage, page_read_bytes,
-            page_zero_bytes, writable))
+      if (!page_table_insert_segment (&thread_current ()->page_table, file, ofs,
+            upage, page_read_bytes, writable))
         return false;
 
       /* Advance. */