primitive exec

1 files changed, 3 insertions, 0 deletions

diff --git a/proc.c b/proc.c
index 573da18..4e44a8e 100644
--- a/proc.c
+++ b/proc.c
@@ -137,6 +137,9 @@ scheduler(void)
   cprintf("start scheduler on cpu %d jmpbuf %p\n", cpu(), &cpus[cpu()].jmpbuf);
   cpus[cpu()].lastproc = &proc[0];
 
+  if(cpus[cpu()].nlock != 0)
+    panic("holding locks at first entry to scheduler");
+
   for(;;){
     // Loop over process table looking for process to run.
     acquire(&proc_table_lock);