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| author | trociny <trociny@FreeBSD.org> | 2013-12-10 20:06:41 +0000 |
|---|---|---|
| committer | trociny <trociny@FreeBSD.org> | 2013-12-10 20:06:41 +0000 |
| commit | 7a816c7150b0046af6a022ef1d7d427ac8e39c7e (patch) | |
| tree | 9b30fe69420145e1da623ef70af6d1095ddfc0f1 /sbin/hastd/secondary.c | |
| parent | f157138bd257c4482e29f29e8ca90c29aa92ad67 (diff) | |
| download | FreeBSD-src-7a816c7150b0046af6a022ef1d7d427ac8e39c7e.zip FreeBSD-src-7a816c7150b0046af6a022ef1d7d427ac8e39c7e.tar.gz | |
Send wakeup to threads waiting on empty queue before releasing the
lock to decrease spurious wakeups.
Submitted by: davidxu
MFC after: 2 weeks
Diffstat (limited to 'sbin/hastd/secondary.c')
| -rw-r--r-- | sbin/hastd/secondary.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/sbin/hastd/secondary.c b/sbin/hastd/secondary.c index 899ee92..5e1207a 100644 --- a/sbin/hastd/secondary.c +++ b/sbin/hastd/secondary.c @@ -110,15 +110,12 @@ static void *disk_thread(void *arg); static void *send_thread(void *arg); #define QUEUE_INSERT(name, hio) do { \ - bool _wakeup; \ - \ mtx_lock(&hio_##name##_list_lock); \ - _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ + if (TAILQ_EMPTY(&hio_##name##_list)) \ + cv_broadcast(&hio_##name##_list_cond); \ TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_next); \ hio_##name##_list_size++; \ mtx_unlock(&hio_##name##_list_lock); \ - if (_wakeup) \ - cv_broadcast(&hio_##name##_list_cond); \ } while (0) #define QUEUE_TAKE(name, hio) do { \ mtx_lock(&hio_##name##_list_lock); \ |
