check preconditions in sched

2006-09-07 16:54:00 +00:00 · 2006-09-07 16:54:00 +00:00 · b6cac0a53b
parent e7a5b3c5ee
commit b6cac0a53b
1 changed files with 5 additions and 0 deletions
--- a/proc.c
+++ b/proc.c
@ -207,6 +207,11 @@ sched(void)
 {
  struct proc *p = curproc[cpu()];

+  if(!holding(&proc_table_lock))
+    panic("sched");
+  if(cpus[cpu()].nlock != 1)
+    panic("sched locks");
+
  if(setjmp(&p->jmpbuf) == 0)
    longjmp(&cpus[cpu()].jmpbuf);
 }