From 52685f417729ae0089f640bc756c8160830c8618 Mon Sep 17 00:00:00 2001
From: Jonathan Gray <jsg@jsg.id.au>
Date: Fri, 15 Mar 2013 15:22:54 +1100
Subject: have wakeup return the number of processes woken up

---
 sys/kern/kern_synch.c | 14 +++++++++-----
 sys/sys/systm.h       |  4 ++--
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c
index f1db615348b..084a194c847 100644
--- a/sys/kern/kern_synch.c
+++ b/sys/kern/kern_synch.c
@@ -350,13 +350,13 @@ unsleep(struct proc *p)
 /*
  * Make a number of processes sleeping on the specified identifier runnable.
  */
-void
+int
 wakeup_n(const volatile void *ident, int n)
 {
 	struct slpque *qp;
 	struct proc *p;
 	struct proc *pnext;
-	int s;
+	int s, woken = 0;
 
 	SCHED_LOCK(s);
 	qp = &slpque[LOOKUP(ident)];
@@ -370,20 +370,24 @@ wakeup_n(const volatile void *ident, int n)
 			--n;
 			p->p_wchan = 0;
 			TAILQ_REMOVE(qp, p, p_runq);
-			if (p->p_stat == SSLEEP)
+			if (p->p_stat == SSLEEP) {
 				setrunnable(p);
+				woken++;
+			}
 		}
 	}
 	SCHED_UNLOCK(s);
+
+	return (woken);
 }
 
 /*
  * Make all processes sleeping on the specified identifier runnable.
  */
-void
+int
 wakeup(const volatile void *chan)
 {
-	wakeup_n(chan, -1);
+	return (wakeup_n(chan, -1));
 }
 
 int
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index dd3823db0c8..bd5a39f1d5d 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -250,8 +250,8 @@ int	sleep_finish_signal(struct sleep_state *);
 void	sleep_queue_init(void);
 
 struct mutex;
-void    wakeup_n(const volatile void *, int);
-void    wakeup(const volatile void *);
+int	wakeup_n(const volatile void *, int);
+int	wakeup(const volatile void *);
 #define wakeup_one(c) wakeup_n((c), 1)
 int	tsleep(const volatile void *, int, const char *, int);
 int	msleep(const volatile void *, struct mutex *, int,  const char*, int);
-- 
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