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| Rev | Author | Line No. | Line |
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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 | |||
| 29 | #include <time/timeout.h> |
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| 30 | #include <typedefs.h> |
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| 31 | #include <arch/types.h> |
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| 32 | #include <config.h> |
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| 33 | #include <synch/spinlock.h> |
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| 34 | #include <func.h> |
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| 35 | #include <cpu.h> |
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| 36 | #include <print.h> |
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| 37 | #include <arch/asm.h> |
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| 38 | #include <arch.h> |
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| 39 | |||
| 40 | void timeout_init(void) |
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| 41 | { |
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| 15 | jermar | 42 | spinlock_initialize(&CPU->timeoutlock); |
| 43 | list_initialize(&CPU->timeout_active_head); |
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| 1 | jermar | 44 | } |
| 45 | |||
| 46 | |||
| 47 | void timeout_reinitialize(timeout_t *t) |
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| 48 | { |
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| 49 | t->cpu = NULL; |
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| 50 | t->ticks = 0; |
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| 51 | t->handler = NULL; |
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| 52 | t->arg = NULL; |
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| 53 | link_initialize(&t->link); |
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| 54 | } |
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| 55 | |||
| 56 | void timeout_initialize(timeout_t *t) |
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| 57 | { |
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| 58 | spinlock_initialize(&t->lock); |
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| 59 | timeout_reinitialize(t); |
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| 60 | } |
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| 61 | |||
| 62 | /* |
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| 63 | * This function registers f for execution in about time microseconds. |
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| 64 | */ |
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| 65 | void timeout_register(timeout_t *t, __u64 time, timeout_handler f, void *arg) |
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| 66 | { |
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| 67 | timeout_t *hlp; |
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| 68 | link_t *l, *m; |
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| 69 | pri_t pri; |
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| 70 | __u64 sum; |
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| 71 | |||
| 72 | pri = cpu_priority_high(); |
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| 15 | jermar | 73 | spinlock_lock(&CPU->timeoutlock); |
| 1 | jermar | 74 | spinlock_lock(&t->lock); |
| 75 | |||
| 76 | if (t->cpu) |
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| 77 | panic("timeout_register: t->cpu != 0"); |
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| 78 | |||
| 15 | jermar | 79 | t->cpu = CPU; |
| 1 | jermar | 80 | t->ticks = us2ticks(time); |
| 81 | |||
| 82 | t->handler = f; |
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| 83 | t->arg = arg; |
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| 84 | |||
| 85 | /* |
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| 86 | * Insert t into the active timeouts list according to t->ticks. |
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| 87 | */ |
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| 88 | sum = 0; |
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| 15 | jermar | 89 | l = CPU->timeout_active_head.next; |
| 90 | while (l != &CPU->timeout_active_head) { |
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| 1 | jermar | 91 | hlp = list_get_instance(l, timeout_t, link); |
| 92 | spinlock_lock(&hlp->lock); |
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| 93 | if (t->ticks < sum + hlp->ticks) { |
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| 94 | spinlock_unlock(&hlp->lock); |
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| 95 | break; |
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| 96 | } |
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| 97 | sum += hlp->ticks; |
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| 98 | spinlock_unlock(&hlp->lock); |
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| 99 | l = l->next; |
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| 100 | } |
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| 101 | m = l->prev; |
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| 102 | list_prepend(&t->link, m); /* avoid using l->prev */ |
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| 103 | |||
| 104 | /* |
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| 105 | * Adjust t->ticks according to ticks accumulated in h's predecessors. |
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| 106 | */ |
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| 107 | t->ticks -= sum; |
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| 108 | |||
| 109 | /* |
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| 110 | * Decrease ticks of t's immediate succesor by t->ticks. |
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| 111 | */ |
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| 15 | jermar | 112 | if (l != &CPU->timeout_active_head) { |
| 1 | jermar | 113 | spinlock_lock(&hlp->lock); |
| 114 | hlp->ticks -= t->ticks; |
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| 115 | spinlock_unlock(&hlp->lock); |
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| 116 | } |
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| 117 | |||
| 118 | spinlock_unlock(&t->lock); |
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| 15 | jermar | 119 | spinlock_unlock(&CPU->timeoutlock); |
| 1 | jermar | 120 | cpu_priority_restore(pri); |
| 121 | } |
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| 122 | |||
| 123 | int timeout_unregister(timeout_t *t) |
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| 124 | { |
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| 125 | timeout_t *hlp; |
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| 126 | link_t *l; |
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| 127 | pri_t pri; |
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| 128 | |||
| 129 | grab_locks: |
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| 130 | pri = cpu_priority_high(); |
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| 131 | spinlock_lock(&t->lock); |
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| 132 | if (!t->cpu) { |
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| 133 | spinlock_unlock(&t->lock); |
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| 134 | cpu_priority_restore(pri); |
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| 135 | return 0; |
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| 136 | } |
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| 137 | if (!spinlock_trylock(&t->cpu->timeoutlock)) { |
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| 138 | spinlock_unlock(&t->lock); |
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| 139 | cpu_priority_restore(pri); |
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| 140 | goto grab_locks; |
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| 141 | } |
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| 142 | |||
| 143 | /* |
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| 144 | * Now we know for sure that t hasn't been activated yet |
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| 145 | * and is lurking in t->cpu->timeout_active_head queue. |
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| 146 | */ |
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| 147 | |||
| 148 | l = t->link.next; |
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| 149 | if (l != &t->cpu->timeout_active_head) { |
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| 150 | hlp = list_get_instance(l, timeout_t, link); |
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| 151 | spinlock_lock(&hlp->lock); |
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| 152 | hlp->ticks += t->ticks; |
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| 153 | spinlock_unlock(&hlp->lock); |
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| 154 | } |
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| 155 | |||
| 156 | list_remove(&t->link); |
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| 157 | spinlock_unlock(&t->cpu->timeoutlock); |
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| 158 | |||
| 159 | timeout_reinitialize(t); |
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| 160 | spinlock_unlock(&t->lock); |
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| 161 | |||
| 162 | cpu_priority_restore(pri); |
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| 163 | return 1; |
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| 164 | } |