fix race in holding() check in acquire()

give cpu1 a TSS and gdt for when it enters scheduler()
and a pseudo proc[] entry for each cpu
cpu0 waits for each other cpu to start up
read() for files

1 files changed, 2 insertions, 0 deletions

diff --git a/user.h b/user.h
index cf98816..d869338 100644
--- a/user.h
+++ b/user.h
@@ -10,6 +10,8 @@ int block(void);
 int kill(int);
 int panic(char*);
 int cons_puts(char*);
+int exec(char *, char **);
+int open(char *, int);
 int mknod (char*,short,short,short);
 int puts(char*);
 int puts1(char*);