| 1 | /*
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| 2 | * Copyright (c) 2006 Josef Cejka
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <stdarg.h>
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| 36 | #include <stdio.h>
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| 37 | #include <unistd.h>
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| 38 | #include <io/printf_core.h>
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| 39 | #include <futex.h>
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| 40 | #include <async.h>
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| 41 |
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| 42 | static atomic_t printf_futex = FUTEX_INITIALIZER;
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| 43 |
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| 44 | static int vprintf_write(const char *str, size_t count, void *unused)
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| 45 | {
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| 46 | return write_stdout(str, count);
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| 47 | }
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| 48 |
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| 49 | /** Print formatted text.
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| 50 | * @param fmt format string
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| 51 | * @param ap format parameters
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| 52 | * \see For more details about format string see printf_core.
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| 53 | */
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| 54 | int vprintf(const char *fmt, va_list ap)
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| 55 | {
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| 56 | struct printf_spec ps = {
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| 57 | (int (*)(void *, size_t, void *)) vprintf_write,
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| 58 | NULL
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| 59 | };
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| 60 | /*
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| 61 | * Prevent other threads to execute printf_core()
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| 62 | */
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| 63 | futex_down(&printf_futex);
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| 64 | /*
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| 65 | * Prevent other pseudo threads of the same thread
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| 66 | * to execute printf_core()
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| 67 | */
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| 68 | async_serialize_start();
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| 69 | int ret = printf_core(fmt, &ps, ap);
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| 70 | async_serialize_end();
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| 71 | futex_up(&printf_futex);
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| 72 | return ret;
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| 73 | }
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| 74 |
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| 75 | /** @}
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| 76 | */
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