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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 Synchronization |
|
- | 30 | * @ingroup kernel |
|
- | 31 | * @{ |
|
- | 32 | */ |
|
- | 33 | ||
29 | /** |
34 | /** |
30 | * @file condvar.c |
35 | * @file |
31 | * @brief Condition variables. |
36 | * @brief Condition variables. |
32 | */ |
37 | */ |
33 | 38 | ||
34 | #include <synch/condvar.h> |
39 | #include <synch/condvar.h> |
35 | #include <synch/mutex.h> |
40 | #include <synch/mutex.h> |
36 | #include <synch/waitq.h> |
41 | #include <synch/waitq.h> |
37 | #include <synch/synch.h> |
42 | #include <synch/synch.h> |
38 | #include <arch.h> |
43 | #include <arch.h> |
39 | #include <typedefs.h> |
44 | #include <typedefs.h> |
40 | 45 | ||
41 | /** Initialize condition variable. |
46 | /** Initialize condition variable. |
42 | * |
47 | * |
43 | * @param cv Condition variable. |
48 | * @param cv Condition variable. |
44 | */ |
49 | */ |
45 | void condvar_initialize(condvar_t *cv) |
50 | void condvar_initialize(condvar_t *cv) |
46 | { |
51 | { |
47 | waitq_initialize(&cv->wq); |
52 | waitq_initialize(&cv->wq); |
48 | } |
53 | } |
49 | 54 | ||
50 | /** |
55 | /** |
51 | * Signal the condition has become true |
56 | * Signal the condition has become true |
52 | * to the first waiting thread by waking it up. |
57 | * to the first waiting thread by waking it up. |
53 | * |
58 | * |
54 | * @param cv Condition variable. |
59 | * @param cv Condition variable. |
55 | */ |
60 | */ |
56 | void condvar_signal(condvar_t *cv) |
61 | void condvar_signal(condvar_t *cv) |
57 | { |
62 | { |
58 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
63 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
59 | } |
64 | } |
60 | 65 | ||
61 | /** |
66 | /** |
62 | * Signal the condition has become true |
67 | * Signal the condition has become true |
63 | * to all waiting threads by waking them up. |
68 | * to all waiting threads by waking them up. |
64 | * |
69 | * |
65 | * @param cv Condition variable. |
70 | * @param cv Condition variable. |
66 | */ |
71 | */ |
67 | void condvar_broadcast(condvar_t *cv) |
72 | void condvar_broadcast(condvar_t *cv) |
68 | { |
73 | { |
69 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
74 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
70 | } |
75 | } |
71 | 76 | ||
72 | /** Wait for the condition becoming true. |
77 | /** Wait for the condition becoming true. |
73 | * |
78 | * |
74 | * @param cv Condition variable. |
79 | * @param cv Condition variable. |
75 | * @param mtx Mutex. |
80 | * @param mtx Mutex. |
76 | * @param usec Timeout value in microseconds. |
81 | * @param usec Timeout value in microseconds. |
77 | * @param flags Select mode of operation. |
82 | * @param flags Select mode of operation. |
78 | * |
83 | * |
79 | * For exact description of meaning of possible combinations |
84 | * For exact description of meaning of possible combinations |
80 | * of usec and flags, see comment for waitq_sleep_timeout(). |
85 | * of usec and flags, see comment for waitq_sleep_timeout(). |
81 | * Note that when SYNCH_FLAGS_NON_BLOCKING is specified here, |
86 | * Note that when SYNCH_FLAGS_NON_BLOCKING is specified here, |
82 | * ESYNCH_WOULD_BLOCK is always returned. |
87 | * ESYNCH_WOULD_BLOCK is always returned. |
83 | * |
88 | * |
84 | * @return See comment for waitq_sleep_timeout(). |
89 | * @return See comment for waitq_sleep_timeout(). |
85 | */ |
90 | */ |
86 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec, int flags) |
91 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec, int flags) |
87 | { |
92 | { |
88 | int rc; |
93 | int rc; |
89 | ipl_t ipl; |
94 | ipl_t ipl; |
90 | 95 | ||
91 | ipl = waitq_sleep_prepare(&cv->wq); |
96 | ipl = waitq_sleep_prepare(&cv->wq); |
92 | mutex_unlock(mtx); |
97 | mutex_unlock(mtx); |
93 | 98 | ||
94 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
99 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
95 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
100 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
96 | 101 | ||
97 | mutex_lock(mtx); |
102 | mutex_lock(mtx); |
98 | waitq_sleep_finish(&cv->wq, rc, ipl); |
103 | waitq_sleep_finish(&cv->wq, rc, ipl); |
99 | 104 | ||
100 | return rc; |
105 | return rc; |
101 | } |
106 | } |
- | 107 | ||
- | 108 | /** @} |
|
- | 109 | */ |
|
- | 110 | ||
102 | 111 |