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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 | /** Signal the condition has become true to the first waiting thread by waking |
53 | /** Signal the condition has become true to the first waiting thread by waking |
54 | * it up. |
54 | * it up. |
55 | * |
55 | * |
56 | * @param cv Condition variable. |
56 | * @param cv Condition variable. |
57 | */ |
57 | */ |
58 | void condvar_signal(condvar_t *cv) |
58 | void condvar_signal(condvar_t *cv) |
59 | { |
59 | { |
60 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
60 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
61 | } |
61 | } |
62 | 62 | ||
63 | /** Signal the condition has become true to all waiting threads by waking |
63 | /** Signal the condition has become true to all waiting threads by waking |
64 | * them up. |
64 | * them up. |
65 | * |
65 | * |
66 | * @param cv Condition variable. |
66 | * @param cv Condition variable. |
67 | */ |
67 | */ |
68 | void condvar_broadcast(condvar_t *cv) |
68 | void condvar_broadcast(condvar_t *cv) |
69 | { |
69 | { |
70 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
70 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
71 | } |
71 | } |
72 | 72 | ||
73 | /** Wait for the condition becoming true. |
73 | /** Wait for the condition becoming true. |
74 | * |
74 | * |
75 | * @param cv Condition variable. |
75 | * @param cv Condition variable. |
76 | * @param mtx Mutex. |
76 | * @param mtx Mutex. |
77 | * @param usec Timeout value in microseconds. |
77 | * @param usec Timeout value in microseconds. |
78 | * @param flags Select mode of operation. |
78 | * @param flags Select mode of operation. |
79 | * |
79 | * |
80 | * For exact description of meaning of possible combinations of usec and flags, |
80 | * For exact description of meaning of possible combinations of usec and flags, |
81 | * see comment for waitq_sleep_timeout(). Note that when |
81 | * see comment for waitq_sleep_timeout(). Note that when |
82 | * SYNCH_FLAGS_NON_BLOCKING is specified here, ESYNCH_WOULD_BLOCK is always |
82 | * SYNCH_FLAGS_NON_BLOCKING is specified here, ESYNCH_WOULD_BLOCK is always |
83 | * returned. |
83 | * returned. |
84 | * |
84 | * |
85 | * @return See comment for waitq_sleep_timeout(). |
85 | * @return See comment for waitq_sleep_timeout(). |
86 | */ |
86 | */ |
87 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, uint32_t usec, int flags) |
87 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, uint32_t usec, int flags) |
88 | { |
88 | { |
89 | int rc; |
89 | int rc; |
90 | ipl_t ipl; |
90 | ipl_t ipl; |
91 | 91 | ||
92 | ipl = waitq_sleep_prepare(&cv->wq); |
92 | ipl = waitq_sleep_prepare(&cv->wq); |
93 | mutex_unlock(mtx); |
93 | mutex_unlock(mtx); |
94 | 94 | ||
95 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
95 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
96 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
96 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
97 | 97 | ||
98 | mutex_lock(mtx); |
98 | mutex_lock(mtx); |
99 | waitq_sleep_finish(&cv->wq, rc, ipl); |
99 | waitq_sleep_finish(&cv->wq, rc, ipl); |
100 | 100 | ||
101 | return rc; |
101 | return rc; |
102 | } |
102 | } |
103 | 103 | ||
104 | /** @} |
104 | /** @} |
105 | */ |
105 | */ |
106 | 106 |