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-rw-r--r--util/aio-wait.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/util/aio-wait.c b/util/aio-wait.c
index a487cdb852..975afddf4c 100644
--- a/util/aio-wait.c
+++ b/util/aio-wait.c
@@ -38,3 +38,34 @@ void aio_wait_kick(AioWait *wait)
aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
}
}
+
+typedef struct {
+ AioWait wait;
+ bool done;
+ QEMUBHFunc *cb;
+ void *opaque;
+} AioWaitBHData;
+
+/* Context: BH in IOThread */
+static void aio_wait_bh(void *opaque)
+{
+ AioWaitBHData *data = opaque;
+
+ data->cb(data->opaque);
+
+ data->done = true;
+ aio_wait_kick(&data->wait);
+}
+
+void aio_wait_bh_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
+{
+ AioWaitBHData data = {
+ .cb = cb,
+ .opaque = opaque,
+ };
+
+ assert(qemu_get_current_aio_context() == qemu_get_aio_context());
+
+ aio_bh_schedule_oneshot(ctx, aio_wait_bh, &data);
+ AIO_WAIT_WHILE(&data.wait, ctx, !data.done);
+}