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/*
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/*
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 * Copyright (c) 2006 Josef Cejka
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 * Copyright (c) 2006 Josef Cejka
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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 *
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 *
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 * - Redistributions of source code must retain the above copyright
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *   derived from this software without specific prior written permission.
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 *
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup libc
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/** @addtogroup libc
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 * @{
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 * @{
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 */
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 */
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/** @file
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/** @file
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 */
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 */
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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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static atomic_t printf_futex = FUTEX_INITIALIZER;
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static 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 fmt   format string
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 * @param fmt   format string
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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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    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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    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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    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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 */
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