diff options
Diffstat (limited to 'include/linux/wait-simple.h')
| -rw-r--r-- | include/linux/wait-simple.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/wait-simple.h b/include/linux/wait-simple.h index 4efba4d..f86bca2 100644 --- a/include/linux/wait-simple.h +++ b/include/linux/wait-simple.h @@ -47,6 +47,14 @@ extern void swait_prepare(struct swait_head *head, struct swaiter *w, int state) extern void swait_finish_locked(struct swait_head *head, struct swaiter *w); extern void swait_finish(struct swait_head *head, struct swaiter *w); +/* Check whether a head has waiters enqueued */ +static inline bool swaitqueue_active(struct swait_head *h) +{ + /* Make sure the condition is visible before checking list_empty() */ + smp_mb(); + return !list_empty(&h->list); +} + /* * Wakeup functions */ |