| 0,0 → 1,104 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <time/clock.h> |
| #include <time/timeout.h> |
| #include <arch/types.h> |
| #include <config.h> |
| #include <synch/spinlock.h> |
| #include <synch/waitq.h> |
| #include <func.h> |
| #include <proc/scheduler.h> |
| #include <cpu.h> |
| #include <print.h> |
| #include <arch.h> |
| #include <list.h> |
| #include <arch/atomic.h> |
| #include <proc/thread.h> |
| |
| /** Clock routine |
| * |
| * Clock routine executed from clock interrupt handler |
| * (assuming interrupts_disable()'d). Runs expired timeouts |
| * and preemptive scheduling. |
| * |
| */ |
| void clock(void) |
| { |
| link_t *l; |
| timeout_t *h; |
| timeout_handler_t f; |
| void *arg; |
| |
| /* |
| * To avoid lock ordering problems, |
| * run all expired timeouts as you visit them. |
| */ |
| spinlock_lock(&CPU->timeoutlock); |
| while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) { |
| h = list_get_instance(l, timeout_t, link); |
| spinlock_lock(&h->lock); |
| if (h->ticks-- != 0) { |
| spinlock_unlock(&h->lock); |
| break; |
| } |
| list_remove(l); |
| f = h->handler; |
| arg = h->arg; |
| timeout_reinitialize(h); |
| spinlock_unlock(&h->lock); |
| spinlock_unlock(&CPU->timeoutlock); |
| |
| f(arg); |
| |
| spinlock_lock(&CPU->timeoutlock); |
| } |
| spinlock_unlock(&CPU->timeoutlock); |
| |
| /* |
| * Do CPU usage accounting and find out whether to preempt THREAD. |
| */ |
| |
| if (THREAD) { |
| __u64 ticks; |
| |
| spinlock_lock(&CPU->lock); |
| CPU->needs_relink++; |
| spinlock_unlock(&CPU->lock); |
| |
| spinlock_lock(&THREAD->lock); |
| if (ticks = THREAD->ticks) |
| THREAD->ticks--; |
| spinlock_unlock(&THREAD->lock); |
| |
| if (!ticks && !PREEMPTION_DISABLED) { |
| scheduler(); |
| } |
| } |
| |
| } |