From 3333665ab68329543d6c51a1d819dc56e1b7cd5d Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Sat, 20 Jul 2019 10:17:26 -0400
Subject: not much
---
kernel/proc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'kernel')
diff --git a/kernel/proc.c b/kernel/proc.c
index 57528f9..e63cc9f 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -49,7 +49,7 @@ mycpu(void) {
return c;
}
-// Return the current struct proc *.
+// Return the current struct proc *, or zero if none.
struct proc*
myproc(void) {
push_off();
@@ -421,7 +421,7 @@ scheduler(void)
c->proc = 0;
for(;;){
- // Let devices interrupt when no lock is held.
+ // Avoid deadlock by ensuring that devices can interrupt.
intr_on();
for(p = proc; p < &proc[NPROC]; p++) {
--
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