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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 __CONDVAR_H__
  30. #define __CONDVAR_H__
  31.  
  32. #include <arch/types.h>
  33. #include <synch/waitq.h>
  34. #include <typedefs.h>
  35. #include <synch/synch.h>
  36.  
  37. struct condvar {
  38.     waitq_t wq;
  39. };
  40.  
  41. #define condvar_wait(cv,mtx) \
  42.     _condvar_wait_timeout((cv),(mtx),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
  43. #define condvar_trywait(cv,mtx) \
  44.     _condvar_wait_timeout((cv),(mtx),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING)
  45. #define condvar_wait_timeout(cv,mtx,usec) \
  46.     _condvar_wait_timeout((cv),(mtx),(usec),SYNCH_NON_BLOCKING)
  47.  
  48. extern void condvar_initialize(condvar_t *cv);
  49. extern void condvar_signal(condvar_t *cv);
  50. extern void condvar_broadcast(condvar_t *cv);
  51. extern int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec, int trywait);
  52.  
  53. #endif
  54.