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authorH. Peter Anvin <hpa@zytor.com>2009-09-10 11:40:36 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-09-10 11:41:24 -0700
commitea9a67f259d41952a990fc2b6224a36f87cb579a (patch)
tree05dd095f6bec9f9542e22a0fcd6e51f7f897b787
parent01fdf7ca787ee0cc82a004c4c01fc714b23f4813 (diff)
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thread: mbox: fix return value for mbox_fetch()thread
Make mbox_fetch() actually return the time spent waiting. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--core/thread/mbox.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/core/thread/mbox.c b/core/thread/mbox.c
index f880b47b..10e46ef7 100644
--- a/core/thread/mbox.c
+++ b/core/thread/mbox.c
@@ -38,9 +38,12 @@ int mbox_post(struct mailbox *mbox, void *msg, jiffies_t timeout)
jiffies_t mbox_fetch(struct mailbox *mbox, void **msg, jiffies_t timeout)
{
- if (sem_down(&mbox->cons_sem, timeout) == (jiffies_t)-1)
+ jiffies_t t;
+
+ t = sem_down(&mbox->cons_sem, timeout);
+ if (t == (jiffies_t)-1)
return -1;
- sem_down(&mbox->tail_sem, 0);
+ t += sem_down(&mbox->tail_sem, 0);
if (msg)
*msg = *mbox->tail;
@@ -50,4 +53,5 @@ jiffies_t mbox_fetch(struct mailbox *mbox, void **msg, jiffies_t timeout)
sem_up(&mbox->tail_sem);
sem_up(&mbox->prod_sem);
+ return t;
}