add dynamic stack growing

1 files changed, 3 insertions, 0 deletions

diff --git a/userprog/process.h b/userprog/process.h
index b7bca5d..ccb94cb 100644
--- a/userprog/process.h
+++ b/userprog/process.h
@@ -3,6 +3,8 @@
 
 #include "threads/thread.h"
 
+#define STACK_SIZE (1 << 23) /* 8MB maxiumum stack size */
+
 /* In the current implementation, the capacity is fixed to 1024 (PGSIZE/4) */
 struct fd_table {
     struct file** fds;
@@ -37,6 +39,7 @@ tid_t process_execute (const char *file_name);
 int process_wait (tid_t);
 void process_exit (void);
 void process_activate (void);
+bool process_grow_stack (void *upage);
 bool process_install_page (void *upage, void *kpage, bool writable);
 
 int process_open_file(const char* fname);