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1 | jermar | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
1 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
1757 | jermar | 29 | /** @addtogroup sync |
1702 | cejka | 30 | * @{ |
31 | */ |
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32 | |||
1264 | jermar | 33 | /** |
1702 | cejka | 34 | * @file |
1264 | jermar | 35 | * @brief Mutexes. |
36 | */ |
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37 | |||
1 | jermar | 38 | #include <synch/mutex.h> |
39 | #include <synch/semaphore.h> |
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386 | jermar | 40 | #include <synch/synch.h> |
3186 | jermar | 41 | #include <debug.h> |
1 | jermar | 42 | |
3186 | jermar | 43 | /** Initialize mutex. |
386 | jermar | 44 | * |
3186 | jermar | 45 | * @param mtx Mutex. |
46 | * @param type Type of the mutex. |
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386 | jermar | 47 | */ |
3186 | jermar | 48 | void mutex_initialize(mutex_t *mtx, mutex_type_t type) |
1 | jermar | 49 | { |
3186 | jermar | 50 | mtx->type = type; |
1 | jermar | 51 | semaphore_initialize(&mtx->sem, 1); |
52 | } |
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53 | |||
3186 | jermar | 54 | /** Acquire mutex. |
386 | jermar | 55 | * |
56 | * Timeout mode and non-blocking mode can be requested. |
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57 | * |
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3186 | jermar | 58 | * @param mtx Mutex. |
59 | * @param usec Timeout in microseconds. |
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60 | * @param flags Specify mode of operation. |
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386 | jermar | 61 | * |
62 | * For exact description of possible combinations of |
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1502 | jermar | 63 | * usec and flags, see comment for waitq_sleep_timeout(). |
386 | jermar | 64 | * |
3186 | jermar | 65 | * @return See comment for waitq_sleep_timeout(). |
386 | jermar | 66 | */ |
1780 | jermar | 67 | int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags) |
1 | jermar | 68 | { |
3186 | jermar | 69 | int rc; |
70 | |||
71 | if (mtx->type == MUTEX_PASSIVE) { |
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72 | rc = _semaphore_down_timeout(&mtx->sem, usec, flags); |
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73 | } else { |
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74 | ASSERT(mtx->type == MUTEX_ACTIVE); |
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75 | ASSERT(usec == SYNCH_NO_TIMEOUT); |
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76 | ASSERT(!(flags & SYNCH_FLAGS_INTERRUPTIBLE)); |
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77 | do { |
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78 | rc = semaphore_trydown(&mtx->sem); |
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79 | } while (SYNCH_FAILED(rc) && |
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80 | !(flags & SYNCH_FLAGS_NON_BLOCKING)); |
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81 | } |
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82 | |||
83 | return rc; |
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1 | jermar | 84 | } |
85 | |||
3186 | jermar | 86 | /** Release mutex. |
386 | jermar | 87 | * |
3186 | jermar | 88 | * @param mtx Mutex. |
386 | jermar | 89 | */ |
1 | jermar | 90 | void mutex_unlock(mutex_t *mtx) |
91 | { |
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92 | semaphore_up(&mtx->sem); |
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93 | } |
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1502 | jermar | 94 | |
1757 | jermar | 95 | /** @} |
1702 | cejka | 96 | */ |