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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. #ifndef __MUTEX_H__
  30. #define __MUTEX_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <synch/semaphore.h>
  35. #include <synch/synch.h>
  36.  
  37. struct mutex {
  38.     semaphore_t sem;
  39. };
  40.  
  41. #define mutex_lock(mtx) \
  42.     _mutex_lock_timeout((mtx),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
  43. #define mutex_trylock(mtx) \
  44.     _mutex_lock_timeout((mtx),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING)
  45. #define mutex_lock_timeout(mtx,usec) \
  46.     _mutex_lock_timeout((mtx),(usec),SYNCH_NON_BLOCKING)
  47. #define mutex_lock_active(mtx) \
  48.     while (mutex_trylock((mtx)) != ESYNCH_OK_ATOMIC)
  49.  
  50. extern void mutex_initialize(mutex_t *mtx);
  51. extern int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int trylock);
  52. extern void mutex_unlock(mutex_t *mtx);
  53.  
  54. #endif
  55.