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2935 | svoboda | 1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
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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 | |||
29 | /** @addtogroup debug |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | #include <stdio.h> |
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36 | #include <stdlib.h> |
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37 | #include <fibril.h> |
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38 | #include <async.h> |
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39 | #include <futex.h> |
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40 | |||
41 | #include "fib_synch.h" |
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42 | |||
43 | void fcv_init(fcv_t *fcv) |
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44 | { |
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45 | int i; |
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46 | |||
47 | for (i = 0; i < MAX_FIB; i++) { |
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48 | fcv->waiting[i] = 0; |
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49 | } |
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50 | } |
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51 | |||
52 | void fcv_wait(fcv_t *fcv) |
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53 | { |
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54 | fid_t fid; |
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55 | int i; |
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56 | |||
57 | futex_down(&async_futex); |
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58 | |||
59 | fid = fibril_get_id(); |
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60 | |||
61 | for (i = 0; i < MAX_FIB; i++) { |
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62 | if (fcv->waiting[i] == 0) { |
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63 | fcv->waiting[i] = fid; |
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64 | |||
65 | fibril_switch(FIBRIL_TO_MANAGER); |
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66 | futex_up(&async_futex); |
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67 | |||
68 | return; |
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69 | } |
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70 | } |
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71 | |||
72 | futex_up(&async_futex); |
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73 | printf("fcv_failed: too many waiting fibrils\n"); |
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74 | exit(1); |
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75 | } |
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76 | |||
77 | void fcv_broadcast(fcv_t *fcv) |
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78 | { |
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79 | int i; |
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80 | |||
81 | futex_down(&async_futex); |
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82 | |||
83 | for (i = 0; i < MAX_FIB; i++) { |
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84 | if (fcv->waiting[i] != 0) { |
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85 | fibril_add_ready(fcv->waiting[i]); |
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86 | fcv->waiting[i] = 0; |
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87 | } |
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88 | } |
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89 | |||
90 | futex_up(&async_futex); |
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91 | } |
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92 | |||
93 | /** @} |
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94 | */ |