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- | 1 | /* |
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- | 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 | #include <arch/atomic.h> |
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- | 42 | #include <proc/thread.h> |
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- | 43 | ||
- | 44 | /** Clock routine |
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- | 45 | * |
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- | 46 | * Clock routine executed from clock interrupt handler |
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- | 47 | * (assuming interrupts_disable()'d). Runs expired timeouts |
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- | 48 | * and preemptive scheduling. |
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- | 49 | * |
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- | 50 | */ |
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- | 51 | void clock(void) |
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- | 52 | { |
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- | 53 | link_t *l; |
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- | 54 | timeout_t *h; |
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- | 55 | timeout_handler_t f; |
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- | 56 | void *arg; |
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- | 57 | ||
- | 58 | /* |
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- | 59 | * To avoid lock ordering problems, |
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- | 60 | * run all expired timeouts as you visit them. |
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- | 61 | */ |
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- | 62 | spinlock_lock(&CPU->timeoutlock); |
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- | 63 | while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) { |
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- | 64 | h = list_get_instance(l, timeout_t, link); |
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- | 65 | spinlock_lock(&h->lock); |
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- | 66 | if (h->ticks-- != 0) { |
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- | 67 | spinlock_unlock(&h->lock); |
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- | 68 | break; |
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- | 69 | } |
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- | 70 | list_remove(l); |
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- | 71 | f = h->handler; |
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- | 72 | arg = h->arg; |
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- | 73 | timeout_reinitialize(h); |
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- | 74 | spinlock_unlock(&h->lock); |
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- | 75 | spinlock_unlock(&CPU->timeoutlock); |
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- | 76 | ||
- | 77 | f(arg); |
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- | 78 | ||
- | 79 | spinlock_lock(&CPU->timeoutlock); |
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- | 80 | } |
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- | 81 | spinlock_unlock(&CPU->timeoutlock); |
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- | 82 | ||
- | 83 | /* |
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- | 84 | * Do CPU usage accounting and find out whether to preempt THREAD. |
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- | 85 | */ |
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- | 86 | ||
- | 87 | if (THREAD) { |
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- | 88 | __u64 ticks; |
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- | 89 | ||
- | 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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- | 93 | ||
- | 94 | spinlock_lock(&THREAD->lock); |
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- | 95 | if (ticks = THREAD->ticks) |
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- | 96 | THREAD->ticks--; |
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- | 97 | spinlock_unlock(&THREAD->lock); |
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- | 98 | ||
- | 99 | if (!ticks && !PREEMPTION_DISABLED) { |
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- | 100 | scheduler(); |
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- | 101 | } |
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- | 102 | } |
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- | 103 | ||
- | 104 | } |
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1 | 105 |