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/*
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup sync
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_WAITQ_H_
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#define KERN_WAITQ_H_
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#include <arch/types.h>
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#include <synch/spinlock.h>
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#include <synch/synch.h>
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#include <adt/list.h>
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typedef enum {
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    WAKEUP_FIRST = 0,
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    WAKEUP_ALL
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} wakeup_mode_t;
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/** Wait queue structure. */
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typedef struct {
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    /** Lock protecting wait queue structure.
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     *
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     * Must be acquired before T.lock for each T of type thread_t.
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     */
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    SPINLOCK_DECLARE(lock);
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    /**
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     * Number of waitq_wakeup() calls that didn't find a thread to wake up.
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     */
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    int missed_wakeups;
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    /** List of sleeping threads for wich there was no missed_wakeup. */
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    link_t head;
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} waitq_t;
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#define waitq_sleep(wq) \
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    waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
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struct thread;
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extern void waitq_initialize(waitq_t *wq);
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extern int waitq_sleep_timeout(waitq_t *wq, uint32_t usec, int flags);
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extern ipl_t waitq_sleep_prepare(waitq_t *wq);
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extern int waitq_sleep_timeout_unsafe(waitq_t *wq, uint32_t usec, int flags);
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extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl);
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extern void waitq_wakeup(waitq_t *wq, wakeup_mode_t mode);
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extern void _waitq_wakeup_unsafe(waitq_t *wq, wakeup_mode_t mode);
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extern void waitq_interrupt_sleep(struct thread *t);
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#endif
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/** @}
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 */