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1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2004 Jakub Jermar |
2 | * Copyright (c) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup sync |
29 | /** @addtogroup sync |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #ifndef KERN_WAITQ_H_ |
35 | #ifndef KERN_WAITQ_H_ |
36 | #define KERN_WAITQ_H_ |
36 | #define KERN_WAITQ_H_ |
37 | 37 | ||
38 | #include <arch/types.h> |
38 | #include <arch/types.h> |
39 | #include <synch/spinlock.h> |
39 | #include <synch/spinlock.h> |
40 | #include <synch/synch.h> |
40 | #include <synch/synch.h> |
41 | #include <adt/list.h> |
41 | #include <adt/list.h> |
42 | 42 | ||
- | 43 | ||
- | 44 | /** Specifies behavior of the waitq_wakeup */ |
|
- | 45 | typedef enum { |
|
- | 46 | WAKEUP_FIRST = 0, /**< Wakes up only the first sleeping thread, if there |
|
- | 47 | aren't any sleeping threads increments missed wakeups */ |
|
- | 48 | WAKEUP_ALL = 1, /**< Wakes up all sleeping threads AND zeroes out |
|
43 | #define WAKEUP_FIRST 0 |
49 | missed_wakeups */ |
- | 50 | WAKEUP_ALL_INC_MISSED, /**< Wakes up all sleeping threads OR increments |
|
- | 51 | missed_wakeups if there aren't any */ |
|
44 | #define WAKEUP_ALL 1 |
52 | } wakeup_all_flag_t; |
- | 53 | ||
45 | 54 | ||
46 | /** Wait queue structure. */ |
55 | /** Wait queue structure. */ |
47 | typedef struct { |
56 | typedef struct { |
48 | 57 | ||
49 | /** Lock protecting wait queue structure. |
58 | /** Lock protecting wait queue structure. |
50 | * |
59 | * |
51 | * Must be acquired before T.lock for each T of type thread_t. |
60 | * Must be acquired before T.lock for each T of type thread_t. |
52 | */ |
61 | */ |
53 | SPINLOCK_DECLARE(lock); |
62 | SPINLOCK_DECLARE(lock); |
54 | 63 | ||
55 | /** |
64 | /** |
56 | * Number of waitq_wakeup() calls that didn't find a thread to wake up. |
65 | * Number of waitq_wakeup() calls that didn't find a thread to wake up. |
57 | */ |
66 | */ |
58 | int missed_wakeups; |
67 | int missed_wakeups; |
59 | /** List of sleeping threads for wich there was no missed_wakeup. */ |
68 | /** List of sleeping threads for wich there was no missed_wakeup. */ |
60 | link_t head; |
69 | link_t head; |
61 | } waitq_t; |
70 | } waitq_t; |
62 | 71 | ||
63 | #define waitq_sleep(wq) \ |
72 | #define waitq_sleep(wq) \ |
64 | waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
73 | waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
65 | 74 | ||
66 | struct thread; |
75 | struct thread; |
67 | 76 | ||
68 | extern void waitq_initialize(waitq_t *wq); |
77 | extern void waitq_initialize(waitq_t *wq); |
69 | extern int waitq_sleep_timeout(waitq_t *wq, uint32_t usec, int flags); |
78 | extern int waitq_sleep_timeout(waitq_t *wq, uint32_t usec, int flags); |
70 | extern ipl_t waitq_sleep_prepare(waitq_t *wq); |
79 | extern ipl_t waitq_sleep_prepare(waitq_t *wq); |
71 | extern int waitq_sleep_timeout_unsafe(waitq_t *wq, uint32_t usec, int flags); |
80 | extern int waitq_sleep_timeout_unsafe(waitq_t *wq, uint32_t usec, int flags); |
72 | extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl); |
81 | extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl); |
73 | extern void waitq_wakeup(waitq_t *wq, bool all); |
82 | extern void waitq_wakeup(waitq_t *wq, int all); |
74 | extern void _waitq_wakeup_unsafe(waitq_t *wq, bool all); |
83 | extern void _waitq_wakeup_unsafe(waitq_t *wq, int all); |
75 | extern void waitq_interrupt_sleep(struct thread *t); |
84 | extern void waitq_interrupt_sleep(struct thread *t); |
76 | 85 | ||
77 | #endif |
86 | #endif |
78 | 87 | ||
79 | /** @} |
88 | /** @} |
80 | */ |
89 | */ |
81 | 90 |