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  1. /*
  2.  * Copyright (c) 2006 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <stdarg.h>
  36. #include <stdio.h>
  37. #include <unistd.h>
  38. #include <io/printf_core.h>
  39. #include <futex.h>
  40. #include <async.h>
  41.  
  42. static atomic_t printf_futex = FUTEX_INITIALIZER;
  43.  
  44. static int vprintf_write(const char *str, size_t count, void *unused)
  45. {
  46.     return write(1, str, count);
  47. }
  48.  
  49. /** Print formatted text.
  50.  * @param fmt   format string
  51.  * @param ap    format parameters
  52.  * \see For more details about format string see printf_core.
  53.  */
  54. int vprintf(const char *fmt, va_list ap)
  55. {
  56.     struct printf_spec ps = {
  57.         (int (*)(void *, size_t, void *)) vprintf_write,
  58.          NULL
  59.     };
  60.     /*
  61.      * Prevent other threads to execute printf_core()
  62.      */
  63.     futex_down(&printf_futex);
  64.     /*
  65.      * Prevent other pseudo threads of the same thread
  66.      * to execute printf_core()
  67.      */
  68.     async_serialize_start();
  69.     int ret = printf_core(fmt, &ps, ap);
  70.     async_serialize_end();
  71.     futex_up(&printf_futex);
  72.     return ret;
  73. }
  74.  
  75. /** @}
  76.  */
  77.