From 3333665ab68329543d6c51a1d819dc56e1b7cd5d Mon Sep 17 00:00:00 2001 From: Robert Morris Date: Sat, 20 Jul 2019 10:17:26 -0400 Subject: not much --- kernel/proc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) 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++) { -- cgit v1.2.3