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