diff options
| -rw-r--r-- | sys/kern/kern_intr.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c index 111dcad..d7ff94e 100644 --- a/sys/kern/kern_intr.c +++ b/sys/kern/kern_intr.c @@ -829,8 +829,14 @@ ok: * Ensure that the thread will process the handler list * again and remove this handler if it has already passed * it on the list. + * + * The release part of the following store ensures + * that the update of ih_flags is ordered before the + * it_need setting. See the comment before + * atomic_cmpset_acq(&ithd->it_need, ...) operation in + * the ithread_execute_handlers(). */ - ie->ie_thread->it_need = 1; + atomic_store_rel_int(&ie->ie_thread->it_need, 1); } else TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); thread_unlock(ie->ie_thread->it_thread); @@ -979,8 +985,14 @@ ok: * Ensure that the thread will process the handler list * again and remove this handler if it has already passed * it on the list. + * + * The release part of the following store ensures + * that the update of ih_flags is ordered before the + * it_need setting. See the comment before + * atomic_cmpset_acq(&ithd->it_need, ...) operation in + * the ithread_execute_handlers(). */ - it->it_need = 1; + atomic_store_rel_int(&it->it_need, 1); } else TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); thread_unlock(it->it_thread); |
