Add yield system call, for zombie test program (bad idea?).

1 files changed, 7 insertions, 0 deletions

diff --git a/sysproc.c b/sysproc.c
index 9d599de..8cf3291 100644
--- a/sysproc.c
+++ b/sysproc.c
@@ -68,3 +68,10 @@ sys_sbrk(void)
   setupsegs(cp);
   return addr;
 }
+
+int
+sys_yield(void)
+{
+  yield();
+  return 0;
+}