implement wait

1 files changed, 10 insertions, 2 deletions

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 177cf02..52526aa 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -88,12 +88,16 @@ exit (int status)
   thread->parent->exit_status = status;
   lock_release (&thread->parent->l);
 
-  printf("%s: exit(%d)\n", thread->name, status);
-
   thread_exit ();
 }
 
 static int
+wait (tid_t child_tid)
+{
+  return process_wait (child_tid);
+}
+
+static int
 read (int fd_i, void *buf, unsigned size)
 {
   struct thread *thread = thread_current ();
@@ -178,6 +182,10 @@ syscall_handler (struct intr_frame *f UNUSED)
       // exec
       f->eax = exec (INTR_ESP (1, char *));
       break;
+    case 3:
+      // wait
+      f->eax = wait (INTR_ESP (1, tid_t));
+      break;
     case 4:
       // create
       f->eax = create (INTR_ESP (1, char *), INTR_ESP (2, off_t));