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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 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Condition variables. |
35 | * @brief Condition variables. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <synch/condvar.h> |
38 | #include <synch/condvar.h> |
39 | #include <synch/mutex.h> |
39 | #include <synch/mutex.h> |
40 | #include <synch/waitq.h> |
40 | #include <synch/waitq.h> |
41 | #include <synch/synch.h> |
41 | #include <synch/synch.h> |
42 | #include <arch.h> |
42 | #include <arch.h> |
43 | 43 | ||
44 | /** Initialize condition variable. |
44 | /** Initialize condition variable. |
45 | * |
45 | * |
46 | * @param cv Condition variable. |
46 | * @param cv Condition variable. |
47 | */ |
47 | */ |
48 | void condvar_initialize(condvar_t *cv) |
48 | void condvar_initialize(condvar_t *cv) |
49 | { |
49 | { |
50 | waitq_initialize(&cv->wq); |
50 | waitq_initialize(&cv->wq); |
51 | } |
51 | } |
52 | 52 | ||
53 | /** |
53 | /** |
54 | * Signal the condition has become true |
54 | * Signal the condition has become true |
55 | * to the first waiting thread by waking it up. |
55 | * to the first waiting thread by waking it up. |
56 | * |
56 | * |
57 | * @param cv Condition variable. |
57 | * @param cv Condition variable. |
58 | */ |
58 | */ |
59 | void condvar_signal(condvar_t *cv) |
59 | void condvar_signal(condvar_t *cv) |
60 | { |
60 | { |
61 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
61 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
62 | } |
62 | } |
63 | 63 | ||
64 | /** |
64 | /** |
65 | * Signal the condition has become true |
65 | * Signal the condition has become true |
66 | * to all waiting threads by waking them up. |
66 | * to all waiting threads by waking them up. |
67 | * |
67 | * |
68 | * @param cv Condition variable. |
68 | * @param cv Condition variable. |
69 | */ |
69 | */ |
70 | void condvar_broadcast(condvar_t *cv) |
70 | void condvar_broadcast(condvar_t *cv) |
71 | { |
71 | { |
72 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
72 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
73 | } |
73 | } |
74 | 74 | ||
75 | /** Wait for the condition becoming true. |
75 | /** Wait for the condition becoming true. |
76 | * |
76 | * |
77 | * @param cv Condition variable. |
77 | * @param cv Condition variable. |
78 | * @param mtx Mutex. |
78 | * @param mtx Mutex. |
79 | * @param usec Timeout value in microseconds. |
79 | * @param usec Timeout value in microseconds. |
80 | * @param flags Select mode of operation. |
80 | * @param flags Select mode of operation. |
81 | * |
81 | * |
82 | * For exact description of meaning of possible combinations |
82 | * For exact description of meaning of possible combinations |
83 | * of usec and flags, see comment for waitq_sleep_timeout(). |
83 | * of usec and flags, see comment for waitq_sleep_timeout(). |
84 | * Note that when SYNCH_FLAGS_NON_BLOCKING is specified here, |
84 | * Note that when SYNCH_FLAGS_NON_BLOCKING is specified here, |
85 | * ESYNCH_WOULD_BLOCK is always returned. |
85 | * ESYNCH_WOULD_BLOCK is always returned. |
86 | * |
86 | * |
87 | * @return See comment for waitq_sleep_timeout(). |
87 | * @return See comment for waitq_sleep_timeout(). |
88 | */ |
88 | */ |
89 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, uint32_t usec, int flags) |
89 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, uint32_t usec, int flags) |
90 | { |
90 | { |
91 | int rc; |
91 | int rc; |
92 | ipl_t ipl; |
92 | ipl_t ipl; |
93 | 93 | ||
94 | ipl = waitq_sleep_prepare(&cv->wq); |
94 | ipl = waitq_sleep_prepare(&cv->wq); |
95 | mutex_unlock(mtx); |
95 | mutex_unlock(mtx); |
96 | 96 | ||
97 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
97 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
98 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
98 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
99 | 99 | ||
100 | mutex_lock(mtx); |
100 | mutex_lock(mtx); |
101 | waitq_sleep_finish(&cv->wq, rc, ipl); |
101 | waitq_sleep_finish(&cv->wq, rc, ipl); |
102 | 102 | ||
103 | return rc; |
103 | return rc; |
104 | } |
104 | } |
105 | 105 | ||
106 | /** @} |
106 | /** @} |
107 | */ |
107 | */ |
108 | 108 |