diff options
| author | Mateusz Guzik <mjg@FreeBSD.org> | 2017-11-26 21:10:47 +0000 |
|---|---|---|
| committer | Mateusz Guzik <mjg@FreeBSD.org> | 2017-11-26 21:10:47 +0000 |
| commit | e57b2b1830d2cc813e2e17d1eda15dba5b212969 (patch) | |
| tree | 403f1623d7af210dbc3204842df0fd6f95705ff2 /sys | |
| parent | 41eeef87ca7fab71d5e021df7ef48434300c13f0 (diff) | |
Notes
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/kern/kern_rwlock.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/kern/kern_rwlock.c b/sys/kern/kern_rwlock.c index 6ccc5e460e52a..dd9823515a725 100644 --- a/sys/kern/kern_rwlock.c +++ b/sys/kern/kern_rwlock.c @@ -769,6 +769,11 @@ __rw_runlock_hard(struct rwlock *rw, struct thread *td, uintptr_t v turnstile_chain_lock(&rw->lock_object); v = RW_READ_VALUE(rw); retry_ts: + if (__predict_false(RW_READERS(v) > 1)) { + turnstile_chain_unlock(&rw->lock_object); + continue; + } + v &= (RW_LOCK_WAITERS | RW_LOCK_WRITE_SPINNER); MPASS(v & RW_LOCK_WAITERS); |