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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 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> |
| 1 | jermar | 41 | |
| 386 | jermar | 42 | /** Initialize mutex |
| 43 | * |
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| 44 | * Initialize mutex. |
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| 45 | * |
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| 46 | * @param mtx Mutex. |
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| 47 | */ |
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| 1 | jermar | 48 | void mutex_initialize(mutex_t *mtx) |
| 49 | { |
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| 50 | semaphore_initialize(&mtx->sem, 1); |
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| 51 | } |
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| 52 | |||
| 386 | jermar | 53 | /** Acquire mutex |
| 54 | * |
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| 55 | * Acquire mutex. |
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| 56 | * Timeout mode and non-blocking mode can be requested. |
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| 57 | * |
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| 404 | jermar | 58 | * @param mtx Mutex. |
| 386 | jermar | 59 | * @param usec Timeout in microseconds. |
| 1502 | jermar | 60 | * @param flags Specify mode of operation. |
| 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 | * |
| 65 | * @return See comment for waitq_sleep_timeout(). |
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| 66 | */ |
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| 1780 | jermar | 67 | int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags) |
| 1 | jermar | 68 | { |
| 1502 | jermar | 69 | return _semaphore_down_timeout(&mtx->sem, usec, flags); |
| 1 | jermar | 70 | } |
| 71 | |||
| 386 | jermar | 72 | /** Release mutex |
| 73 | * |
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| 74 | * Release mutex. |
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| 75 | * |
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| 76 | * @param mtx Mutex. |
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| 77 | */ |
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| 1 | jermar | 78 | void mutex_unlock(mutex_t *mtx) |
| 79 | { |
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| 80 | semaphore_up(&mtx->sem); |
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| 81 | } |
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| 1502 | jermar | 82 | |
| 1757 | jermar | 83 | /** @} |
| 1702 | cejka | 84 | */ |