Replace yield system call with sleep.

1 files changed, 1 insertions, 0 deletions

diff --git a/user.h b/user.h
index 1bbe2fd..c3ee675 100644
--- a/user.h
+++ b/user.h
@@ -18,6 +18,7 @@ int chdir(char*);
 int dup(int);
 int getpid();
 char* sbrk(int);
+int sleep(int);
 
 // ulib.c
 int stat(char*, struct stat*);