Rev 1264 | Rev 1702 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 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 |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 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 |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 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 |
||
| 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 |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 1264 | jermar | 29 | /** |
| 30 | * @file mutex.c |
||
| 31 | * @brief Mutexes. |
||
| 32 | */ |
||
| 33 | |||
| 1 | jermar | 34 | #include <synch/mutex.h> |
| 35 | #include <synch/semaphore.h> |
||
| 386 | jermar | 36 | #include <synch/synch.h> |
| 1 | jermar | 37 | |
| 386 | jermar | 38 | /** Initialize mutex |
| 39 | * |
||
| 40 | * Initialize mutex. |
||
| 41 | * |
||
| 42 | * @param mtx Mutex. |
||
| 43 | */ |
||
| 1 | jermar | 44 | void mutex_initialize(mutex_t *mtx) |
| 45 | { |
||
| 46 | semaphore_initialize(&mtx->sem, 1); |
||
| 47 | } |
||
| 48 | |||
| 386 | jermar | 49 | /** Acquire mutex |
| 50 | * |
||
| 51 | * Acquire mutex. |
||
| 52 | * Timeout mode and non-blocking mode can be requested. |
||
| 53 | * |
||
| 404 | jermar | 54 | * @param mtx Mutex. |
| 386 | jermar | 55 | * @param usec Timeout in microseconds. |
| 1502 | jermar | 56 | * @param flags Specify mode of operation. |
| 386 | jermar | 57 | * |
| 58 | * For exact description of possible combinations of |
||
| 1502 | jermar | 59 | * usec and flags, see comment for waitq_sleep_timeout(). |
| 386 | jermar | 60 | * |
| 61 | * @return See comment for waitq_sleep_timeout(). |
||
| 62 | */ |
||
| 1502 | jermar | 63 | int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int flags) |
| 1 | jermar | 64 | { |
| 1502 | jermar | 65 | return _semaphore_down_timeout(&mtx->sem, usec, flags); |
| 1 | jermar | 66 | } |
| 67 | |||
| 386 | jermar | 68 | /** Release mutex |
| 69 | * |
||
| 70 | * Release mutex. |
||
| 71 | * |
||
| 72 | * @param mtx Mutex. |
||
| 73 | */ |
||
| 1 | jermar | 74 | void mutex_unlock(mutex_t *mtx) |
| 75 | { |
||
| 76 | semaphore_up(&mtx->sem); |
||
| 77 | } |
||
| 1502 | jermar | 78 |