| 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 <typedefs.h>
|
|---|
| 39 | #include <synch/spinlock.h>
|
|---|
| 40 | #include <abi/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 | *
|
|---|
| 50 | */
|
|---|
| 51 | typedef struct {
|
|---|
| 52 | /** Lock protecting wait queue structure.
|
|---|
| 53 | *
|
|---|
| 54 | * Must be acquired before T.lock for each T of type thread_t.
|
|---|
| 55 | */
|
|---|
| 56 | IRQ_SPINLOCK_DECLARE(lock);
|
|---|
| 57 |
|
|---|
| 58 | /**
|
|---|
| 59 | * Number of waitq_wakeup() calls that didn't find a thread to wake up.
|
|---|
| 60 | *
|
|---|
| 61 | */
|
|---|
| 62 | int missed_wakeups;
|
|---|
| 63 |
|
|---|
| 64 | /** Number of wakeups that need to be ignored due to futex timeout. */
|
|---|
| 65 | int ignore_wakeups;
|
|---|
| 66 |
|
|---|
| 67 | /** List of sleeping threads for which there was no missed_wakeup. */
|
|---|
| 68 | list_t sleepers;
|
|---|
| 69 | } waitq_t;
|
|---|
| 70 |
|
|---|
| 71 | #define waitq_sleep(wq) \
|
|---|
| 72 | waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE, NULL)
|
|---|
| 73 |
|
|---|
| 74 | struct thread;
|
|---|
| 75 |
|
|---|
| 76 | extern void waitq_initialize(waitq_t *);
|
|---|
| 77 | extern errno_t waitq_sleep_timeout(waitq_t *, uint32_t, unsigned int, bool *);
|
|---|
| 78 | extern ipl_t waitq_sleep_prepare(waitq_t *);
|
|---|
| 79 | extern errno_t waitq_sleep_timeout_unsafe(waitq_t *, uint32_t, unsigned int, bool *);
|
|---|
| 80 | extern void waitq_sleep_finish(waitq_t *, bool, ipl_t);
|
|---|
| 81 | extern void waitq_wakeup(waitq_t *, wakeup_mode_t);
|
|---|
| 82 | extern void _waitq_wakeup_unsafe(waitq_t *, wakeup_mode_t);
|
|---|
| 83 | extern void waitq_interrupt_sleep(struct thread *);
|
|---|
| 84 | extern void waitq_unsleep(waitq_t *);
|
|---|
| 85 | extern int waitq_count_get(waitq_t *);
|
|---|
| 86 | extern void waitq_count_set(waitq_t *, int val);
|
|---|
| 87 |
|
|---|
| 88 | #endif
|
|---|
| 89 |
|
|---|
| 90 | /** @}
|
|---|
| 91 | */
|
|---|
