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Sometimes it's necessary for the main loop thread to run a BH in an IOThread and wait for its completion. This primitive is useful during startup/shutdown to synchronize and avoid race conditions. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20180307144205.20619-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>