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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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| 788 | jermar | 40 | #include <adt/list.h> |
| 1104 | jermar | 41 | #include <atomic.h> |
| 391 | jermar | 42 | #include <proc/thread.h> |
| 1 | jermar | 43 | |
| 107 | decky | 44 | /** Clock routine |
| 45 | * |
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| 46 | * Clock routine executed from clock interrupt handler |
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| 413 | jermar | 47 | * (assuming interrupts_disable()'d). Runs expired timeouts |
| 107 | decky | 48 | * and preemptive scheduling. |
| 49 | * |
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| 1 | jermar | 50 | */ |
| 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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| 411 | jermar | 55 | timeout_handler_t f; |
| 1 | jermar | 56 | void *arg; |
| 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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| 15 | jermar | 62 | spinlock_lock(&CPU->timeoutlock); |
| 63 | while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) { |
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| 1 | jermar | 64 | h = list_get_instance(l, timeout_t, link); |
| 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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| 15 | jermar | 75 | spinlock_unlock(&CPU->timeoutlock); |
| 1 | jermar | 76 | |
| 77 | f(arg); |
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| 78 | |||
| 15 | jermar | 79 | spinlock_lock(&CPU->timeoutlock); |
| 1 | jermar | 80 | } |
| 15 | jermar | 81 | spinlock_unlock(&CPU->timeoutlock); |
| 1 | jermar | 82 | |
| 83 | /* |
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| 15 | jermar | 84 | * Do CPU usage accounting and find out whether to preempt THREAD. |
| 1 | jermar | 85 | */ |
| 86 | |||
| 15 | jermar | 87 | if (THREAD) { |
| 221 | jermar | 88 | __u64 ticks; |
| 89 | |||
| 15 | jermar | 90 | spinlock_lock(&CPU->lock); |
| 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); |
| 615 | palkovsky | 95 | if ((ticks = THREAD->ticks)) |
| 221 | jermar | 96 | THREAD->ticks--; |
| 97 | spinlock_unlock(&THREAD->lock); |
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| 98 | |||
| 99 | if (!ticks && !PREEMPTION_DISABLED) { |
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| 1 | jermar | 100 | scheduler(); |
| 101 | } |
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| 102 | } |
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| 103 | |||
| 104 | } |