Method mark

src/backend/cpu/queue.hpp:142–142

    int create() { return event_.create(); }

    int mark(queue &q) { return event_.mark(q.aQueue); }
    int wait(queue &q) { return event_.wait(q.aQueue); }
    int sync() noexcept { return event_.sync(); }
    operator bool() const noexcept { return event_; }