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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/clock.h> |
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| 30 | #include <time/timeout.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 <synch/waitq.h> |
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| 35 | #include <func.h> |
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| 36 | #include <proc/scheduler.h> |
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| 37 | #include <cpu.h> |
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| 38 | #include <print.h> |
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| 39 | #include <arch.h> |
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| 40 | #include <list.h> |
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| 41 | |||
| 42 | #ifdef __SMP__ |
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| 11 | jermar | 43 | #include <arch/smp/atomic.h> |
| 1 | jermar | 44 | #endif |
| 45 | |||
| 107 | decky | 46 | /** Clock routine |
| 47 | * |
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| 48 | * Clock routine executed from clock interrupt handler |
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| 49 | * (assuming cpu_priority_high()). Runs expired timeouts |
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| 50 | * and preemptive scheduling. |
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| 51 | * |
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| 1 | jermar | 52 | */ |
| 53 | void clock(void) |
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| 54 | { |
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| 55 | link_t *l; |
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| 56 | timeout_t *h; |
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| 57 | timeout_handler f; |
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| 58 | void *arg; |
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| 59 | |||
| 60 | /* |
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| 61 | * To avoid lock ordering problems, |
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| 62 | * run all expired timeouts as you visit them. |
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| 63 | */ |
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| 15 | jermar | 64 | spinlock_lock(&CPU->timeoutlock); |
| 65 | while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) { |
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| 1 | jermar | 66 | h = list_get_instance(l, timeout_t, link); |
| 67 | spinlock_lock(&h->lock); |
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| 68 | if (h->ticks-- != 0) { |
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| 69 | spinlock_unlock(&h->lock); |
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| 70 | break; |
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| 71 | } |
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| 72 | list_remove(l); |
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| 73 | f = h->handler; |
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| 74 | arg = h->arg; |
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| 75 | timeout_reinitialize(h); |
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| 76 | spinlock_unlock(&h->lock); |
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| 15 | jermar | 77 | spinlock_unlock(&CPU->timeoutlock); |
| 1 | jermar | 78 | |
| 79 | f(arg); |
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| 80 | |||
| 15 | jermar | 81 | spinlock_lock(&CPU->timeoutlock); |
| 1 | jermar | 82 | } |
| 15 | jermar | 83 | spinlock_unlock(&CPU->timeoutlock); |
| 1 | jermar | 84 | |
| 85 | /* |
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| 15 | jermar | 86 | * Do CPU usage accounting and find out whether to preempt THREAD. |
| 1 | jermar | 87 | */ |
| 88 | |||
| 15 | jermar | 89 | if (THREAD) { |
| 90 | spinlock_lock(&CPU->lock); |
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| 91 | CPU->needs_relink++; |
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| 92 | spinlock_unlock(&CPU->lock); |
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| 1 | jermar | 93 | |
| 15 | jermar | 94 | spinlock_lock(&THREAD->lock); |
| 95 | if (!THREAD->ticks--) { |
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| 96 | spinlock_unlock(&THREAD->lock); |
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| 1 | jermar | 97 | scheduler(); |
| 98 | } |
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| 99 | else { |
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| 15 | jermar | 100 | spinlock_unlock(&THREAD->lock); |
| 1 | jermar | 101 | } |
| 102 | } |
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| 103 | |||
| 104 | } |