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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 __WAITQ_H__
  30. #define __WAITQ_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <synch/spinlock.h>
  35. #include <synch/synch.h>
  36. #include <adt/list.h>
  37.  
  38. #define WAKEUP_FIRST    0
  39. #define WAKEUP_ALL  1
  40.  
  41. /** Wait queue structure. */
  42. struct waitq {
  43.  
  44.     /** Lock protecting wait queue structure.
  45.      *
  46.      * Must be acquired before T.lock for each T of type thread_t.
  47.      */
  48.     SPINLOCK_DECLARE(lock);
  49.  
  50.     int missed_wakeups; /**< Number of waitq_wakeup() calls that didn't find a thread to wake up. */
  51.     link_t head;        /**< List of sleeping threads for wich there was no missed_wakeup. */
  52. };
  53.  
  54. #define waitq_sleep(wq) \
  55.     waitq_sleep_timeout((wq),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
  56.  
  57. extern void waitq_initialize(waitq_t *wq);
  58. extern int waitq_sleep_timeout(waitq_t *wq, __u32 usec, int nonblocking);
  59. extern ipl_t waitq_sleep_prepare(waitq_t *wq);
  60. extern int waitq_sleep_timeout_unsafe(waitq_t *wq, __u32 usec, int nonblocking);
  61. extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl);
  62. extern void waitq_wakeup(waitq_t *wq, bool all);
  63. extern void _waitq_wakeup_unsafe(waitq_t *wq, bool all);
  64. extern void waitq_interrupt_sleep(thread_t *t);
  65.  
  66. #endif
  67.