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| Rev | Author | Line No. | Line |
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| 1113 | palkovsky | 1 | /* |
| 4516 | jermar | 2 | * Copyright (c) 2009 Jakub Jermar |
| 1113 | palkovsky | 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 | |||
| 1719 | decky | 29 | /** @addtogroup libc |
| 1653 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 4516 | jermar | 35 | #include <fibril_sync.h> |
| 36 | #include <fibril.h> |
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| 37 | #include <async.h> |
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| 4509 | decky | 38 | #include <adt/list.h> |
| 1392 | palkovsky | 39 | #include <futex.h> |
| 40 | #include <assert.h> |
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| 1113 | palkovsky | 41 | |
| 4516 | jermar | 42 | void fibril_mutex_initialize(fibril_mutex_t *fm) |
| 1129 | palkovsky | 43 | { |
| 4516 | jermar | 44 | fm->counter = 1; |
| 45 | list_initialize(&fm->waiters); |
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| 1129 | palkovsky | 46 | } |
| 47 | |||
| 4516 | jermar | 48 | void fibril_mutex_lock(fibril_mutex_t *fm) |
| 1129 | palkovsky | 49 | { |
| 4516 | jermar | 50 | futex_down(&async_futex); |
| 51 | if (fm->counter-- <= 0) { |
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| 52 | fibril_t *f = (fibril_t *) fibril_get_id(); |
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| 53 | list_append(&f->link, &fm->waiters); |
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| 54 | fibril_switch(FIBRIL_TO_MANAGER); |
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| 55 | } else { |
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| 56 | futex_up(&async_futex); |
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| 57 | } |
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| 1129 | palkovsky | 58 | } |
| 59 | |||
| 4516 | jermar | 60 | bool fibril_mutex_trylock(fibril_mutex_t *fm) |
| 1113 | palkovsky | 61 | { |
| 4516 | jermar | 62 | bool locked = false; |
| 1392 | palkovsky | 63 | |
| 4516 | jermar | 64 | futex_down(&async_futex); |
| 65 | if (fm->counter > 0) { |
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| 66 | fm->counter--; |
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| 67 | locked = true; |
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| 1392 | palkovsky | 68 | } |
| 4516 | jermar | 69 | futex_up(&async_futex); |
| 1610 | palkovsky | 70 | |
| 4516 | jermar | 71 | return locked; |
| 1113 | palkovsky | 72 | } |
| 73 | |||
| 4516 | jermar | 74 | void fibril_mutex_unlock(fibril_mutex_t *fm) |
| 1113 | palkovsky | 75 | { |
| 4516 | jermar | 76 | futex_down(&async_futex); |
| 77 | assert(fm->counter <= 0); |
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| 78 | if (fm->counter++ < 0) { |
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| 79 | link_t *tmp; |
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| 80 | fibril_t *f; |
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| 81 | |||
| 82 | assert(!list_empty(&fm->waiters)); |
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| 83 | tmp = fm->waiters.next; |
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| 84 | f = list_get_instance(tmp, fibril_t, link); |
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| 85 | list_remove(&f->link); |
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| 86 | fibril_add_ready((fid_t) f); |
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| 1113 | palkovsky | 87 | } |
| 4516 | jermar | 88 | futex_up(&async_futex); |
| 1392 | palkovsky | 89 | } |
| 90 | |||
| 4516 | jermar | 91 | void fibril_rwlock_initialize(fibril_rwlock_t *frw) |
| 1392 | palkovsky | 92 | { |
| 4516 | jermar | 93 | fibril_mutex_initialize(&frw->fm); |
| 1392 | palkovsky | 94 | } |
| 1113 | palkovsky | 95 | |
| 4516 | jermar | 96 | void fibril_rwlock_read_lock(fibril_rwlock_t *frw) |
| 1392 | palkovsky | 97 | { |
| 4516 | jermar | 98 | fibril_mutex_lock(&frw->fm); |
| 1113 | palkovsky | 99 | } |
| 1392 | palkovsky | 100 | |
| 4516 | jermar | 101 | void fibril_rwlock_write_lock(fibril_rwlock_t *frw) |
| 1392 | palkovsky | 102 | { |
| 4516 | jermar | 103 | fibril_mutex_lock(&frw->fm); |
| 1392 | palkovsky | 104 | } |
| 1427 | palkovsky | 105 | |
| 4516 | jermar | 106 | void fibril_rwlock_read_unlock(fibril_rwlock_t *frw) |
| 1427 | palkovsky | 107 | { |
| 4516 | jermar | 108 | fibril_mutex_unlock(&frw->fm); |
| 1427 | palkovsky | 109 | } |
| 1610 | palkovsky | 110 | |
| 4516 | jermar | 111 | void fibril_rwlock_write_unlock(fibril_rwlock_t *frw) |
| 1610 | palkovsky | 112 | { |
| 4516 | jermar | 113 | fibril_mutex_unlock(&frw->fm); |
| 1610 | palkovsky | 114 | } |
| 115 | |||
| 1719 | decky | 116 | /** @} |
| 1653 | cejka | 117 | */ |