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| 1 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
| 1 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 1888 | jermar | 29 | /** @addtogroup sync |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_WAITQ_H_ |
| 36 | #define KERN_WAITQ_H_ |
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| 1 | jermar | 37 | |
| 38 | #include <arch/types.h> |
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| 39 | #include <synch/spinlock.h> |
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| 40 | #include <synch/synch.h> |
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| 788 | jermar | 41 | #include <adt/list.h> |
| 1 | jermar | 42 | |
| 43 | |||
| 2308 | hudecek | 44 | /** Specifies behavior of the waitq_wakeup */ |
| 45 | typedef enum { |
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| 46 | WAKEUP_FIRST = 0, /**< Wakes up only the first sleeping thread, if there |
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| 47 | aren't any sleeping threads increments missed wakeups */ |
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| 48 | WAKEUP_ALL = 1, /**< Wakes up all sleeping threads AND zeroes out |
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| 49 | missed_wakeups */ |
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| 50 | WAKEUP_ALL_INC_MISSED, /**< Wakes up all sleeping threads OR increments |
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| 51 | missed_wakeups if there aren't any */ |
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| 52 | } wakeup_all_flag_t; |
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| 53 | |||
| 54 | |||
| 557 | jermar | 55 | /** Wait queue structure. */ |
| 2085 | decky | 56 | typedef struct { |
| 557 | jermar | 57 | |
| 58 | /** Lock protecting wait queue structure. |
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| 59 | * |
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| 60 | * Must be acquired before T.lock for each T of type thread_t. |
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| 61 | */ |
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| 623 | jermar | 62 | SPINLOCK_DECLARE(lock); |
| 557 | jermar | 63 | |
| 2106 | jermar | 64 | /** |
| 65 | * Number of waitq_wakeup() calls that didn't find a thread to wake up. |
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| 66 | */ |
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| 67 | int missed_wakeups; |
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| 68 | /** List of sleeping threads for wich there was no missed_wakeup. */ |
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| 69 | link_t head; |
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| 2085 | decky | 70 | } waitq_t; |
| 1 | jermar | 71 | |
| 72 | #define waitq_sleep(wq) \ |
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| 2089 | decky | 73 | waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
| 1 | jermar | 74 | |
| 2109 | jermar | 75 | struct thread; |
| 76 | |||
| 1 | jermar | 77 | extern void waitq_initialize(waitq_t *wq); |
| 1780 | jermar | 78 | extern int waitq_sleep_timeout(waitq_t *wq, uint32_t usec, int flags); |
| 1375 | jermar | 79 | extern ipl_t waitq_sleep_prepare(waitq_t *wq); |
| 1780 | jermar | 80 | extern int waitq_sleep_timeout_unsafe(waitq_t *wq, uint32_t usec, int flags); |
| 1375 | jermar | 81 | extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl); |
| 2308 | hudecek | 82 | extern void waitq_wakeup(waitq_t *wq, int all); |
| 83 | extern void _waitq_wakeup_unsafe(waitq_t *wq, int all); |
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| 2109 | jermar | 84 | extern void waitq_interrupt_sleep(struct thread *t); |
| 1 | jermar | 85 | |
| 86 | #endif |
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| 1702 | cejka | 87 | |
| 1888 | jermar | 88 | /** @} |
| 1702 | cejka | 89 | */ |