From 47e69250d08acc7d91d791148a37f4279f5939c9 Mon Sep 17 00:00:00 2001
From: Frans Kaashoek <kaashoek@mit.edu>
Date: Wed, 3 Jul 2019 15:38:30 -0400
Subject: Simplify wakeup1
---
kernel/proc.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/kernel/proc.c b/kernel/proc.c
index 9202b61..1201c8b 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -529,19 +529,13 @@ sleep(void *chan, struct spinlock *lk)
}
//PAGEBREAK!
-// Wake up all processes sleeping on chan,
-// where chan is a proc, which is locked.
+// Wake up locked parent, used by exit()
static void
-wakeup1(struct proc *chan)
+wakeup1(struct proc *p)
{
- struct proc *p;
-
- for(p = ptable.proc; p < &ptable.proc[NPROC]; p++)
- if(p == chan && p->state == SLEEPING && p->chan == chan) {
- if(p->state != SLEEPING || p->chan != chan)
- panic("wakeup1");
- p->state = RUNNABLE;
- }
+ if(p->chan == p && p->state == SLEEPING) {
+ p->state = RUNNABLE;
+ }
}
// Wake up all processes sleeping on chan. Never
--
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