diff options
| -rw-r--r-- | async.c | 16 | ||||
| -rw-r--r-- | include/block/aio.h | 3 |
2 files changed, 17 insertions, 2 deletions
diff --git a/async.c b/async.c index 8d23681526..efce14b63a 100644 --- a/async.c +++ b/async.c @@ -79,8 +79,10 @@ int aio_bh_poll(AioContext *ctx) * aio_notify again if necessary. */ if (!bh->deleted && atomic_xchg(&bh->scheduled, 0)) { - if (!bh->idle) + /* Idle BHs and the notify BH don't count as progress */ + if (!bh->idle && bh != ctx->notify_dummy_bh) { ret = 1; + } bh->idle = 0; bh->cb(bh->opaque); } @@ -230,6 +232,7 @@ aio_ctx_finalize(GSource *source) { AioContext *ctx = (AioContext *) source; + qemu_bh_delete(ctx->notify_dummy_bh); thread_pool_free(ctx->thread_pool); qemu_mutex_lock(&ctx->bh_lock); @@ -298,8 +301,15 @@ static void aio_timerlist_notify(void *opaque) static void aio_rfifolock_cb(void *opaque) { + AioContext *ctx = opaque; + /* Kick owner thread in case they are blocked in aio_poll() */ - aio_notify(opaque); + qemu_bh_schedule(ctx->notify_dummy_bh); +} + +static void notify_dummy_bh(void *opaque) +{ + /* Do nothing, we were invoked just to force the event loop to iterate */ } static void event_notifier_dummy_cb(EventNotifier *e) @@ -326,6 +336,8 @@ AioContext *aio_context_new(Error **errp) rfifolock_init(&ctx->lock, aio_rfifolock_cb, ctx); timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx); + ctx->notify_dummy_bh = aio_bh_new(ctx, notify_dummy_bh, NULL); + return ctx; } diff --git a/include/block/aio.h b/include/block/aio.h index 9dd32e0f13..400b1b0020 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -114,6 +114,9 @@ struct AioContext { bool notified; EventNotifier notifier; + /* Scheduling this BH forces the event loop it iterate */ + QEMUBH *notify_dummy_bh; + /* Thread pool for performing work and receiving completion callbacks */ struct ThreadPool *thread_pool; |