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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 Mutexes. |
35 | * @brief Mutexes. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <synch/mutex.h> |
38 | #include <synch/mutex.h> |
39 | #include <synch/semaphore.h> |
39 | #include <synch/semaphore.h> |
40 | #include <synch/synch.h> |
40 | #include <synch/synch.h> |
- | 41 | #include <debug.h> |
|
41 | 42 | ||
42 | /** Initialize mutex |
43 | /** Initialize mutex. |
43 | * |
- | |
44 | * Initialize mutex. |
- | |
45 | * |
44 | * |
46 | * @param mtx Mutex. |
45 | * @param mtx Mutex. |
- | 46 | * @param type Type of the mutex. |
|
47 | */ |
47 | */ |
48 | void mutex_initialize(mutex_t *mtx) |
48 | void mutex_initialize(mutex_t *mtx, mutex_type_t type) |
49 | { |
49 | { |
- | 50 | mtx->type = type; |
|
50 | semaphore_initialize(&mtx->sem, 1); |
51 | semaphore_initialize(&mtx->sem, 1); |
51 | } |
52 | } |
52 | 53 | ||
53 | /** Acquire mutex |
54 | /** Acquire mutex. |
54 | * |
55 | * |
55 | * Acquire mutex. |
- | |
56 | * Timeout mode and non-blocking mode can be requested. |
56 | * Timeout mode and non-blocking mode can be requested. |
57 | * |
57 | * |
58 | * @param mtx Mutex. |
58 | * @param mtx Mutex. |
59 | * @param usec Timeout in microseconds. |
59 | * @param usec Timeout in microseconds. |
60 | * @param flags Specify mode of operation. |
60 | * @param flags Specify mode of operation. |
61 | * |
61 | * |
62 | * For exact description of possible combinations of |
62 | * For exact description of possible combinations of |
63 | * usec and flags, see comment for waitq_sleep_timeout(). |
63 | * usec and flags, see comment for waitq_sleep_timeout(). |
64 | * |
64 | * |
65 | * @return See comment for waitq_sleep_timeout(). |
65 | * @return See comment for waitq_sleep_timeout(). |
66 | */ |
66 | */ |
67 | int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags) |
67 | int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags) |
68 | { |
68 | { |
- | 69 | int rc; |
|
- | 70 | ||
- | 71 | if (mtx->type == MUTEX_PASSIVE) { |
|
69 | return _semaphore_down_timeout(&mtx->sem, usec, flags); |
72 | rc = _semaphore_down_timeout(&mtx->sem, usec, flags); |
- | 73 | } else { |
|
- | 74 | ASSERT(mtx->type == MUTEX_ACTIVE); |
|
- | 75 | ASSERT(usec == SYNCH_NO_TIMEOUT); |
|
- | 76 | ASSERT(!(flags & SYNCH_FLAGS_INTERRUPTIBLE)); |
|
- | 77 | do { |
|
- | 78 | rc = semaphore_trydown(&mtx->sem); |
|
- | 79 | } while (SYNCH_FAILED(rc) && |
|
- | 80 | !(flags & SYNCH_FLAGS_NON_BLOCKING)); |
|
70 | } |
81 | } |
71 | 82 | ||
72 | /** Release mutex |
83 | return rc; |
73 | * |
84 | } |
- | 85 | ||
74 | * Release mutex. |
86 | /** Release mutex. |
75 | * |
87 | * |
76 | * @param mtx Mutex. |
88 | * @param mtx Mutex. |
77 | */ |
89 | */ |
78 | void mutex_unlock(mutex_t *mtx) |
90 | void mutex_unlock(mutex_t *mtx) |
79 | { |
91 | { |
80 | semaphore_up(&mtx->sem); |
92 | semaphore_up(&mtx->sem); |
81 | } |
93 | } |
82 | 94 | ||
83 | /** @} |
95 | /** @} |
84 | */ |
96 | */ |
85 | 97 |