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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  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. /**
  30.  * @file    mutex.c
  31.  * @brief   Mutexes.
  32.  */
  33.  
  34. #include <synch/mutex.h>
  35. #include <synch/semaphore.h>
  36. #include <synch/synch.h>
  37.  
  38. /** Initialize mutex
  39.  *
  40.  * Initialize mutex.
  41.  *
  42.  * @param mtx Mutex.
  43.  */
  44. void mutex_initialize(mutex_t *mtx)
  45. {
  46.     semaphore_initialize(&mtx->sem, 1);
  47. }
  48.  
  49. /** Acquire mutex
  50.  *
  51.  * Acquire mutex.
  52.  * Timeout mode and non-blocking mode can be requested.
  53.  *
  54.  * @param mtx Mutex.
  55.  * @param usec Timeout in microseconds.
  56.  * @param flags Specify mode of operation.
  57.  *
  58.  * For exact description of possible combinations of
  59.  * usec and flags, see comment for waitq_sleep_timeout().
  60.  *
  61.  * @return See comment for waitq_sleep_timeout().
  62.  */
  63. int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int flags)
  64. {
  65.     return _semaphore_down_timeout(&mtx->sem, usec, flags);
  66. }
  67.  
  68. /** Release mutex
  69.  *
  70.  * Release mutex.
  71.  *
  72.  * @param mtx Mutex.
  73.  */
  74. void mutex_unlock(mutex_t *mtx)
  75. {
  76.     semaphore_up(&mtx->sem);
  77. }
  78.  
  79.