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     * Prevent other threads to execute printf_core()
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     * Prevent other threads to execute printf_core()
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     */
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     */
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    futex_down(&printf_futex);
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    futex_down(&printf_futex);
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    /*
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    /*
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     * Prevent other pseudo threads of the same thread
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     * Prevent other fibrils of the same thread
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     * to execute printf_core()
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     * to execute printf_core()
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     */
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     */
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    async_serialize_start();
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    async_serialize_start();
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    int ret = printf_core(fmt, &ps, ap);
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    int ret = printf_core(fmt, &ps, ap);