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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. /** @addtogroup sync
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_MUTEX_H_
  36. #define KERN_MUTEX_H_
  37.  
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <synch/semaphore.h>
  41. #include <synch/synch.h>
  42.  
  43. struct mutex {
  44.     semaphore_t sem;
  45. };
  46.  
  47. #define mutex_lock(mtx) \
  48.     _mutex_lock_timeout((mtx),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
  49. #define mutex_trylock(mtx) \
  50.     _mutex_lock_timeout((mtx),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING)
  51. #define mutex_lock_timeout(mtx,usec) \
  52.     _mutex_lock_timeout((mtx),(usec),SYNCH_FLAGS_NON_BLOCKING)
  53. #define mutex_lock_active(mtx) \
  54.     while (mutex_trylock((mtx)) != ESYNCH_OK_ATOMIC)
  55.  
  56. extern void mutex_initialize(mutex_t *mtx);
  57. extern int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags);
  58. extern void mutex_unlock(mutex_t *mtx);
  59.  
  60. #endif
  61.  
  62. /** @}
  63.  */
  64.