From 2c58ceb889efd1483f3986827134135d6d977a4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Fri, 12 Mar 2021 16:13:28 +0100
Subject: implement wait

---
 src/userprog/syscall.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'src/userprog/syscall.c')

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
@@ -88,11 +88,15 @@ 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)
 {
@@ -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));
-- 
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