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#include <stdarg.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <io/printf_core.h>
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#include <io/printf_core.h>
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#include <futex.h>
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#include <async.h>
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int vprintf_write(const char *str, size_t count, void *unused);
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static atomic_t printf_futex = FUTEX_INITIALIZER;
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int vprintf_write(const char *str, size_t count, void *unused)
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static int vprintf_write(const char *str, size_t count, void *unused)
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{
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{
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    return write(1, str, count);
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    return write(1, str, count);
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}
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}
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/** Print formatted text.
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/** Print formatted text.
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 * @param ap    format parameters
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 * @param ap    format parameters
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 * \see For more details about format string see printf_core.
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 * \see For more details about format string see printf_core.
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 */
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 */
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int vprintf(const char *fmt, va_list ap)
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int vprintf(const char *fmt, va_list ap)
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{
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{
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    struct printf_spec ps = {
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    struct printf_spec ps = {(int(*)(void *, size_t, void *))vprintf_write, NULL};
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        (int (*)(void *, size_t, void *)) vprintf_write,
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         NULL
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    };
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    /*
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     * Prevent other threads to execute printf_core()
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     */
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    return printf_core(fmt, &ps, ap);
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    futex_down(&printf_futex);
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    /*
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     * Prevent other pseudo threads of the same thread
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     * to execute printf_core()
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     */
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    async_serialize_start();
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    int ret = printf_core(fmt, &ps, ap);
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    async_serialize_end();
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    futex_up(&printf_futex);
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    return ret;
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}
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}
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/** @}
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/** @}
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 */
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 */