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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 Condition variables. |
36 | */ |
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37 | |||
1 | jermar | 38 | #include <synch/condvar.h> |
39 | #include <synch/mutex.h> |
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40 | #include <synch/waitq.h> |
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387 | jermar | 41 | #include <synch/synch.h> |
1375 | jermar | 42 | #include <arch.h> |
1 | jermar | 43 | |
1375 | jermar | 44 | /** Initialize condition variable. |
387 | jermar | 45 | * |
3425 | svoboda | 46 | * @param cv Condition variable. |
387 | jermar | 47 | */ |
1 | jermar | 48 | void condvar_initialize(condvar_t *cv) |
49 | { |
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50 | waitq_initialize(&cv->wq); |
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51 | } |
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52 | |||
3425 | svoboda | 53 | /** Signal the condition has become true to the first waiting thread by waking |
54 | * it up. |
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387 | jermar | 55 | * |
3425 | svoboda | 56 | * @param cv Condition variable. |
387 | jermar | 57 | */ |
1 | jermar | 58 | void condvar_signal(condvar_t *cv) |
59 | { |
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60 | waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
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61 | } |
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62 | |||
3425 | svoboda | 63 | /** Signal the condition has become true to all waiting threads by waking |
64 | * them up. |
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387 | jermar | 65 | * |
3425 | svoboda | 66 | * @param cv Condition variable. |
387 | jermar | 67 | */ |
1 | jermar | 68 | void condvar_broadcast(condvar_t *cv) |
69 | { |
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70 | waitq_wakeup(&cv->wq, WAKEUP_ALL); |
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71 | } |
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72 | |||
1375 | jermar | 73 | /** Wait for the condition becoming true. |
387 | jermar | 74 | * |
3425 | svoboda | 75 | * @param cv Condition variable. |
76 | * @param mtx Mutex. |
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77 | * @param usec Timeout value in microseconds. |
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78 | * @param flags Select mode of operation. |
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404 | jermar | 79 | * |
3425 | svoboda | 80 | * For exact description of meaning of possible combinations of usec and flags, |
81 | * see comment for waitq_sleep_timeout(). Note that when |
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82 | * SYNCH_FLAGS_NON_BLOCKING is specified here, ESYNCH_WOULD_BLOCK is always |
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83 | * returned. |
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404 | jermar | 84 | * |
3425 | svoboda | 85 | * @return See comment for waitq_sleep_timeout(). |
387 | jermar | 86 | */ |
1780 | jermar | 87 | int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, uint32_t usec, int flags) |
1 | jermar | 88 | { |
89 | int rc; |
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1375 | jermar | 90 | ipl_t ipl; |
1 | jermar | 91 | |
1375 | jermar | 92 | ipl = waitq_sleep_prepare(&cv->wq); |
1 | jermar | 93 | mutex_unlock(mtx); |
1375 | jermar | 94 | |
1416 | jermar | 95 | cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
1502 | jermar | 96 | rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
1416 | jermar | 97 | |
1 | jermar | 98 | mutex_lock(mtx); |
1375 | jermar | 99 | waitq_sleep_finish(&cv->wq, rc, ipl); |
100 | |||
1 | jermar | 101 | return rc; |
102 | } |
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1702 | cejka | 103 | |
1757 | jermar | 104 | /** @} |
1702 | cejka | 105 | */ |