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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_WAITQ_H_
  36. #define KERN_WAITQ_H_
  37.  
  38. #include <arch/types.h>
  39. #include <synch/spinlock.h>
  40. #include <synch/synch.h>
  41. #include <adt/list.h>
  42.  
  43. typedef enum {
  44.     WAKEUP_FIRST = 0,
  45.     WAKEUP_ALL
  46. } wakeup_mode_t;
  47.  
  48. /** Wait queue structure. */
  49. typedef struct {
  50.  
  51.     /** Lock protecting wait queue structure.
  52.      *
  53.      * Must be acquired before T.lock for each T of type thread_t.
  54.      */
  55.     SPINLOCK_DECLARE(lock);
  56.  
  57.     /**
  58.      * Number of waitq_wakeup() calls that didn't find a thread to wake up.
  59.      */
  60.     int missed_wakeups;
  61.     /** List of sleeping threads for wich there was no missed_wakeup. */
  62.     link_t head;
  63. } waitq_t;
  64.  
  65. #define waitq_sleep(wq) \
  66.     waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
  67.  
  68. struct thread;
  69.  
  70. extern void waitq_initialize(waitq_t *wq);
  71. extern int waitq_sleep_timeout(waitq_t *wq, uint32_t usec, int flags);
  72. extern ipl_t waitq_sleep_prepare(waitq_t *wq);
  73. extern int waitq_sleep_timeout_unsafe(waitq_t *wq, uint32_t usec, int flags);
  74. extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl);
  75. extern void waitq_wakeup(waitq_t *wq, wakeup_mode_t mode);
  76. extern void _waitq_wakeup_unsafe(waitq_t *wq, wakeup_mode_t mode);
  77. extern void waitq_interrupt_sleep(struct thread *t);
  78.  
  79. #endif
  80.  
  81. /** @}
  82.  */
  83.