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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 | #include <synch/mutex.h> |
29 | #include <synch/mutex.h> |
30 | #include <synch/semaphore.h> |
30 | #include <synch/semaphore.h> |
31 | #include <synch/synch.h> |
31 | #include <synch/synch.h> |
32 | 32 | ||
33 | /** Initialize mutex |
33 | /** Initialize mutex |
34 | * |
34 | * |
35 | * Initialize mutex. |
35 | * Initialize mutex. |
36 | * |
36 | * |
37 | * @param mtx Mutex. |
37 | * @param mtx Mutex. |
38 | */ |
38 | */ |
39 | void mutex_initialize(mutex_t *mtx) |
39 | void mutex_initialize(mutex_t *mtx) |
40 | { |
40 | { |
41 | semaphore_initialize(&mtx->sem, 1); |
41 | semaphore_initialize(&mtx->sem, 1); |
42 | } |
42 | } |
43 | 43 | ||
44 | /** Acquire mutex |
44 | /** Acquire mutex |
45 | * |
45 | * |
46 | * Acquire mutex. |
46 | * Acquire mutex. |
47 | * Timeout mode and non-blocking mode can be requested. |
47 | * Timeout mode and non-blocking mode can be requested. |
48 | * |
48 | * |
49 | * @param mtx Mutex. |
49 | * @param mtx Mutex. |
50 | * @param usec Timeout in microseconds. |
50 | * @param usec Timeout in microseconds. |
51 | * @param trylock Switches between blocking and non-blocking mode. |
51 | * @param trylock Switches between blocking and non-blocking mode. |
52 | * |
52 | * |
53 | * For exact description of possible combinations of |
53 | * For exact description of possible combinations of |
54 | * 'usec' and 'trylock', see comment for waitq_sleep_timeout(). |
54 | * 'usec' and 'trylock', see comment for waitq_sleep_timeout(). |
55 | * |
55 | * |
56 | * @return See comment for waitq_sleep_timeout(). |
56 | * @return See comment for waitq_sleep_timeout(). |
57 | */ |
57 | */ |
58 | int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int trylock) |
58 | int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int trylock) |
59 | { |
59 | { |
60 | return _semaphore_down_timeout(&mtx->sem, usec, trylock); |
60 | return _semaphore_down_timeout(&mtx->sem, usec, trylock); |
61 | } |
61 | } |
62 | 62 | ||
63 | /** Release mutex |
63 | /** Release mutex |
64 | * |
64 | * |
65 | * Release mutex. |
65 | * Release mutex. |
66 | * |
66 | * |
67 | * @param mtx Mutex. |
67 | * @param mtx Mutex. |
68 | */ |
68 | */ |
69 | void mutex_unlock(mutex_t *mtx) |
69 | void mutex_unlock(mutex_t *mtx) |
70 | { |
70 | { |
71 | semaphore_up(&mtx->sem); |
71 | semaphore_up(&mtx->sem); |
72 | } |
72 | } |
73 | 73 |