| 1 | /*
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| 2 | * Copyright (c) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup kernel_sync
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_WAITQ_H_
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| 36 | #define KERN_WAITQ_H_
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| 37 |
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| 38 | #include <typedefs.h>
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| 39 | #include <synch/spinlock.h>
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| 40 | #include <abi/synch.h>
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| 41 | #include <adt/list.h>
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| 42 |
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| 43 | /** Wait queue structure.
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| 44 | *
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| 45 | */
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| 46 | typedef struct waitq {
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| 47 | /** Lock protecting wait queue structure.
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| 48 | *
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| 49 | * Must be acquired before T.lock for each T of type thread_t.
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| 50 | */
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| 51 | IRQ_SPINLOCK_DECLARE(lock);
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| 52 |
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| 53 | /**
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| 54 | * If negative, number of wakeups that are to be ignored (necessary for futex operation).
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| 55 | * If positive, number of wakeups that weren't able to wake a thread.
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| 56 | */
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| 57 | int wakeup_balance;
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| 58 |
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| 59 | /** List of sleeping threads for which there was no missed_wakeup. */
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| 60 | list_t sleepers;
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| 61 |
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| 62 | bool closed;
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| 63 | } waitq_t;
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| 64 |
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| 65 | typedef struct wait_guard {
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| 66 | ipl_t ipl;
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| 67 | } wait_guard_t;
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| 68 |
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| 69 | struct thread;
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| 70 |
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| 71 | extern void waitq_initialize(waitq_t *);
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| 72 | extern void waitq_initialize_with_count(waitq_t *, int);
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| 73 | extern errno_t waitq_sleep(waitq_t *);
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| 74 | extern errno_t _waitq_sleep_timeout(waitq_t *, uint32_t, unsigned int);
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| 75 | extern errno_t waitq_sleep_timeout(waitq_t *, uint32_t);
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| 76 | extern wait_guard_t waitq_sleep_prepare(waitq_t *);
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| 77 | extern errno_t waitq_sleep_unsafe(waitq_t *, wait_guard_t);
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| 78 | extern errno_t waitq_sleep_timeout_unsafe(waitq_t *, uint32_t, unsigned int, wait_guard_t);
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| 79 |
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| 80 | extern void waitq_wake_one(waitq_t *);
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| 81 | extern void waitq_wake_all(waitq_t *);
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| 82 | extern void waitq_signal(waitq_t *);
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| 83 | extern void waitq_close(waitq_t *);
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| 84 |
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| 85 | #endif
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| 86 |
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| 87 | /** @}
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| 88 | */
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